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TM 55-1520-236-23-2 TECHNICAL MANUAL AVIATION UNIT AND INTERMEDIATE MAINTENANCE MANUAL ARMY MODEL AH-IP (PROD) AH-1E (ECAS) AH-1F (MODERNIZED COBRA) HELICOPTERS “Approved for public release; distribution is unlimited.” HEADQUARTERS, DEPARTMENT OF THE ARMY 8 MAY 1980

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Page 1: TECHNICAL MANUAL AVIATION UNIT AND INTERMEDIATE ...combatindex.com/store/tech_man/Sample/ah-1/TM_55-1520-236-23-… · AH-1 F (MODERNIZED COBRA) HELICOPTERS REPORTING ERRORS AND RECOMMENDING

TM 55-1520-236-23-2

TECHNICAL MANUAL

AVIATION UNIT AND INTERMEDIATEMAINTENANCE MANUAL

ARMY MODELAH-IP (PROD)AH-1E (ECAS)

AH-1F (MODERNIZED COBRA)HELICOPTERS

“Approved for public release; distribution is unlimited.”

HEADQUARTERS, DEPARTMENT OF THE ARMY8 MAY 1980

Page 2: TECHNICAL MANUAL AVIATION UNIT AND INTERMEDIATE ...combatindex.com/store/tech_man/Sample/ah-1/TM_55-1520-236-23-… · AH-1 F (MODERNIZED COBRA) HELICOPTERS REPORTING ERRORS AND RECOMMENDING

TM 55-1520-236-23

TECHNICAL MANUAL HEADQUARTERSDEPARTMENT OF THE ARMY

NO. 55-1520-236-23 WASHINGTON, D. C., 8 May 1980

AVIATION UNIT AND INTERMEDIATE MAINTENANCE MANUALARMY MODEL

AH-1P (PROD)AH-1E (ECAS)

AH-1 F (MODERNIZED COBRA)HELICOPTERS

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS

You can help improve this manual. If you find any mistakes, or if you know of away to improve these procedures,please let us know. Mail your letter or DA Form 2028 (Recommended Changes to Publications end BlankForms), or DA Form 2028-2 located in the back of this manual directly to: Commander, US Army Aviation andTroop Command, ATTN: AMSAT-I-MP, 4300 Goodfellow Blvd., St. Louis, MO 63120-1798. A reply will befurnished directly to you.

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.

VOLUME 1

CHAPTER 1

Section I

Section II

Section Ill

Section IV

Section V

Section VI

CHAPTER 2

Section I

Section II

Section Ill

Section IV

Section V

CHAPTER 3

Section 1

Section II

Section Ill

Section IV

Section V

CHAPTER 4

Section I

Section II

TABLE OF CONTENTS

PARAGRAPH

AIRCRAFT GENERAL

Servicing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Handling, jacking, mooring, hoisting, and sling loading . . . . . .

Inspection requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Overhaul and retirement schedule . . . . . . . . . . . . . . . . . . . . .

Flight safety critical aircraft parts (FSCAP) program . . . . . . . .

AIRFRAME

Structural . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fuselage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tailboom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Wing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Deleted

LANDING GEAR

Landing Gear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Skids/Struts (Not Applicable) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Floats (Not Applicable) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Skis (Not Applicable) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Brakes (Not Applicable) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

POWER PLANT

Power plant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cooling system (Not Applicable) . . . . . . . . . . . . . . . . . . . . .

1-1

1-28

1-30

1-55

1-58

1-59

2-1

2-41

2-281

2-335

2-352

3-1

4-1

PAGE

1-1

1-41

1-45

1-58

1-87

1-89

2-1

2-113

2-229

2-245

2-258

3-1

3-29

3-29

3-29

3-29

4-1

4-17

C h a n g e 2 2 i

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TM 55-1520-236-23

Section Ill

Section IV

Section V

Section VI

Section VII

Section Vlll

CHAPTER 5

Section I

Section II

Section Ill

Section IV

Section V

Section VI

Section VII

Section VIII

CHAPTER 6

Section I

Section II

Section Ill

Section IV

Section V

Section VI

section Vll

VOLUME II

CHAPTER 7

CHAPTER 8

Section I

Section II

Section Ill

Section IV

Section V

Section VI

CHAPTER 9

Section I

Section II

Section Ill

Section IV

Section V

Section VI

Section VII

Section VIII

Air induction system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Exhaust system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Oil system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

lgnition system (Not Applicable) . . . . . . . . . . . . . . . . . . . . . . . . . .

Power lever controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Quick change assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ROTORS

Main rotor system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Main rotor hub and blades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Main rotor controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tail rotor system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tail rotor hub and blade assembly. . . . . . . . . . . . . . . . . . . . . . . .

Tail rotor hub and controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tail rotor blades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tracking and balancing procedures . . . . . . . . . . . . . . . . . . . . . . .

DRIVE TRAIN SYSTEM

Drive train . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Main drive shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Main transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tail rotor drive shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Intermediate gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tail rotor gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Transmission oil system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

HYDRAULIC AND PNEUMATIC SYSTEMS . . . . . . . . . . . . . . .

INSTRUMENTS SYSTEM

Instrument maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Engine instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Flight instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Navigation instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Miillaneous instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Instrument panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ELECTRICALSYSTEMS

Electrical systems maintenance. . . . . . . . . . . . . . . . . . . . . . . . . .

Direct current power distribution system . . . . . . . . . . . . . . . . . . .

Alternating current power distibution system . . . . . . . . . . . . . .

Starting system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Ignition system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lighting provisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Miscellaneous equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Armament systems arcuitry . . . . . . . . . . . . . . . . . . . . . . . . .

PARAGRAPH

4-24

4-39

4-59

4-98

4-114

5-3

5-8

5-47

5-72

5-79

5-89

5-107

5-114

6-1

6-5

6-20

6-75

6-96

6-113

6-129

8-1

8-10

8-114

8-185

8-198

8-285

9-1

8-37

9-119

9-238

8-246

8-254

9-340

9-412

PAGE

4-18

4-36

4-50.2

4-69

4-69

4-79

5-1

5-2.2

5-103

5-138

5-141

5-148

5-170

5-181

6-1

6-7

6-24

6-75

6-86

6-103

6-120.1

7-1

8-1

8-7

8-25

8-36

8-38

8-52

9-1

9-27

9-56

9-73

9-75

9-76

9-102

9-122

i i Change 22

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TM 55-1520-236-23

Section IX

Sction X

CHAPTER 10

Section I

Section II

CHAPTER 11

Section ISection II

CHAPTER 12

Section I

Section II

Section Ill

section IV

CHAPTER 13

Section I

Section II

CHAPTER 14

CHAPTER 15

CHAPTER 16

CHAPTER 17

APPENDIX A

APPENDIX B

APPENDIX C

VOLUME Ill

APPENDIX D

APPENDIX E

Section I

Section II

Section Ill

Section IV

APPENDIX F

APPENDIX G

Armament systems circuitry . . . . . . . . . . . . . . . . . . . . . . . .

Armament and fire control systems circuitry . . . . . . . . . . .

FUELSYSTEMS

Fuel systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fuel cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FLIGHT ONTROLS

Flight controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Flight controls components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

UTILITY SYSTEM

Fire detection system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rain removal system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Defroster system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Low G Warning System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ENVIRONMENTAL CONTROL SYSTEM

Heating systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Air cooling systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

HOIST AND WINCHES (Nonapplicable) . . . . . . . . . . . . . . . . . .

AUXILIARY POWER PLANT (Not Applicable) . . . . . . . . . . . . . .

MISSION EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EMERGENCY EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MAINTENANCE ALLOCATION CHART . . . . . . . . . . . . . . . . . . .

AIRCRAFT INVENTORY MASTER GUIDE . . . . . . . . . . . . . . . .

ILLUSTRATED FIELD MANUFACTURE LIST . . . . . . . . . . . . . .

STORAGE OF AIR CRAFT

General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Flyable storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Short term storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

lntermediate storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

WIRE LISTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

lNDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VOLUME IV

FOLDOUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VOLUME V

FOLDOUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PARAGRAPH

9-442

9-496

10-1

10-73

11-111-145

12-1

12-9

12-1012-11

13-113-125

14-1

15-1

16-1

17-1

E-1E-6

E-10

E-14

PAGE

9-154

9-185

1 0 1

10-17

11-111-81

12-1

12-4

12-412-5

13-1

13-37

14-1

15-1

16-1

17-1

A-1

B-1

C-1

D-1

E-1E-2

E 4

E-11

F-1

G-1

Index-1

FO-1

FO-143

Change 21 iii

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TM 55-1520-236-23

LIST OF lLLUSTUSTRATIONS

1-91-9.1

NUMBER

1-11-1.11-21-31-41-51-61-71-8

1-101-111-122-12-22-32-42-52-62-72-82-92-102-112-122-132-142-152-15.12-162-172-182-192-202-212-222-232-242-252-262-272-282-292-302-31

2-322-332-342-352-362-37

PAGE

1-21-2.3

1-421-461-481-501-531-54.21-551-571-592-2.12-42-82-142-162-232-362-372-382-402-422-432-442-452-462-46.12-472-482-492-502-512-522-532-542-552-562-572-582-602-612-622-642-66.12-66.22-822-852-872-882-892-90

2-31.12-31.2

iv Change 16

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TM 55-1520-236-23

LIST OF ILLUSTRATIONS (CONT)

NUMBER PAGETITLE

2-382-392-402-412-422-432-43.12-442-452-462-46.12-472-482-48.12-492-502-512-522-532-542-54.12-552-562-572-57.1

2-582-58.1

2-592-602-612-622-632-642-652-662-672-682-692-702-70.12-70.22-712-722-732-742-752-762-772-77.1

2-912-922-962-1002-1012-1022-1042-104.12-1052-1062-106.12-1072-1112-112.22-1152-1232-1262-1322-1392-1422-144.32-1462-1522-154

2-154.12-155

2-158.12-1612-1642-1672-1692-1702-1762-1782-1792-1802-1832-1882-190.12-190.22-1912-1922-1962-1992-2002-2022-2042-2062-206.1

Change 20 v

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TM 55-1520-236-23

NUMBER

2-782-792-76.12-79.22-79.3

2-79.42-79.52-802-812-822-832-842-85

2-862-872-882-89

2-902-912-922-92.12-932-942-952-962-972-98

2-992-100

2-1012-1022-1032-1042-1053-13-1.13-23-3

3-4.13-53-6

vi

PAGE

2-209

2-2102-212.22-212.32-212.3

2-212.42-212.42-2142-2152-2162-2172-2182-2192-2212-2232-2242-2262-2302-2312-2322-232.12-2342-2372-2402-2422-2442-246

2-2502-251

2-2522-2532-2542-256

3-2

3-4.13-53-63-93-10.23-12

3-15

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TM 55-1520-236-23

LIST OF ILLUSTRATIONS (CON’T)

NUMBER3-73-83-93-103-114-14-24-34-3.14-44-54-64-7

4-7.1

4-8

4-8.1

4-9

4-104-10.1

4-114-12

4-13

4-144-15

4-15.14-15.24-164-17

4-17.1

4-184-18.14-194-19.14-19.24-19.34-20

TITLEGround Handling Gear -assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ground Handling Gear Pump, P/N BU0953B-Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ground Handling Gear Pump, P/N HP9902-41-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Work Aid - Packing Nut Tool Removal/lnstallation - Fabrication Instructions . . . . . . . . . . . .Ground Handling Wheels -Adjustment Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Power Plant lnstallation - Right Side... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Power Plant installation -Left Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Engine Vibration Test Equipment Cabling Tiedown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DeletedEngine installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Engine Mount Fittings(Trunnions) installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits Aft - Engine Mount Fittings (Trunnions) and Bearings . . . . . . . . . . . . . . . . .Particle Separator and FOD Screen Installation (Prior to Incorporation of

MW0 55-1520-236-50-12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Centrisep Particle Separator Installation (After Incorporation ofMW0 55-1520-236-50-12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Particle Separator-Air Flow Diagram (Prior to Incorporation ofMWO 55-1520-236-50-12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Centrisep Particle Separator Air Flow Diagram (After Incorporation ofMWO 55-1520-236-50-12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Particle Separator and FOD Screen Assemblies (Prior to incorporation ofMW0 55-1520-236-50-12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inlet Vane Reinforcement Doubler-Fabrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Centrisep Particle Separator Repair/Replacement (After Incorporation ofMW0 55-1520-236-50-12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FOD (Foreign Object Damage)Screen Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Exhaust System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Engine Tailpipe Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Engine Deck and Firewall Sealing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Exhaust System Components with lR Suppression Installation . . . . . . . . . . . . . .Hot Metal Plus Plume Suppressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Outer Body Half -Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Repair Procedures -infrared Suppression System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Exhaust System Components with lR Suppression -Installation . . . . . . . . . . . . . . . .

Suppressor Major Structural Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Engine Oil System installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ODDS Oil Separator and Oil Filter installation (MWO 1-l520-236-50-30) . . . . . . . . . . . .Engine Oil System Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Oil Separator (Lubriclone) Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DeletedEngine External Oil Fitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Oil Tank lnstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PAGE3-173-193-213-233-254-24-2.24-4

4-74-134-16

4-19

4-22.2

4-23

4-24.1

4-264-30

4-30.14-34

4-37

4-384-40

4-414-44.104-44.114-45

4-47

4-504-50.14-50.34-54.34-54.4

4-54.74-57

Change 21 vi.1

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TM 55-1520-236-23

NUMBER4-214-224-234-244-254-264-274-284-294-304-314-324-33

PAGE4-604-614-644-664-704-734-754-794-814-834-844-85

4-86

vi.2 Change 21

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TM 55-1520-236-23

4-40

TITLE

LIST OF ILLUSTRATIONS (CON’T)

NUMBER

4-344-354-364-374-384-39

4-414-425-15-25-35-454.15-4.25-55-65-75-85-95-105-115-125-135-146-155-165-16.15-17

5-18

5-195-19.15-205-20.15-21

5-225-235-245-24.15-24.25-255-265-27

Starter Generator and Gas Producer Tachometer Generator . . . . . . . . . . . . .Installation Engine Torque Transducer Hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Installation Fuel Drain and Bleed Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Installation Starter Fuel Filter and Oil Bypass Valve Hose .. . . . . . . . . . . . . . . . .. . . . . . .Installation Bleed Air Tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Installation Oil Hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Installation Heat Shield Tailpipe and Ejector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Electrical Cable Installation Engine Left Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Electrical Cable Installation Engine Right SideMain Rotor System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ......Main Rotor Installation . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...............Main Rotor System Torque Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tool Application Grip Lock Installation on Pitch HornBarrel Jack Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Barrel Jack Work Aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...................Tool Application Main Rotor Mast Nut Removal - Installation . . . . . . . . . . . .Tool Application Alignment of Main Rotor Hub and Blade . . . . . . . . . . . .Damage Limits Cone SetPitch Link Assembly AdjustmentsPitch Link Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...................Main Rotor Hub and Blade AssemblyWork Aid for Main Rotor Blade Bolt Removal Fabrication Instructions (AVIM)Work Aid Application Main Rotor Blade Retaining Bolt Removal . . . . . . . . . . . .B540 Main Rotor Blade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................B540 Main Rotor Blade Authorized patch Area (AVIM) . . . . . . . . . . . . . . .B540 Main Rotor Blade Trim Tab Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .K747 Main Rotor Blade (Part Numbers K747-003-205, -209, -303) . . . . . . .K747 Main Rotor Blade (Part Numbers K747-003-309, -401, -403)External Appearance Changes to K747-003-205/-309, -209/-401, and -303/-403

Blades Resulting from Improved Weight Retention Features . . . . . . . . . . .Internal Modification Incorporated in K747-003-205/-309, -209/-401, and -303/-403

Blades for Improved Weight Retention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits - Root Fitting (K747 Blade) . . . . . . . . . . .Damage Limits - Root Fittings - Part Number K747-083-1 (K747 Blade)Damage Limits - Drag Strut (P/N K747-072-1) (K747 Blade) . . . . . . . . . . . . . . . . . .Damage Limits - Drag Strut - Part Number K747-082-1 (K747 Blade) . . . . . . . . .Inspection of K747-003-205/-309, -209/401, -303/403 Blades for Loss of Blade Weight

Retention Integrity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Proximity Limits for Patches - K747 Main Rotor BladesBalance Adjustment for Patches (K747 Blade) . . . . . . . . . . . . . . . .Root Fitting Assembly (K747-205, -209,-303 Blades) . . . . . . . . . . . . . . . . . . . . . . . . . . .Root Fitting Assembly (-309, -401,403 Blades)Drag Strut Assembly (-309, -401,-403 Blades) . . . . . . . . . . . . . . . . .Application of Skin Patch (K747 Blade) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Curing Patch with Blade Repair Fixture (K747 Blade) . . . . . . . . . . . . .Installation of Plug Patch (K747 Blade)

PAGE

4874-894-914-924-934-954-964-974-1005-25-45-65-75-85-8.15-8.25-95-115-135-145-165-175-185-235-265-275-30 .1 5-31

5-32

5-335-36 .2 5-375-38 5-38.1

5-395-405-435-525-52.15-52.35-545-565-60

Change 20 vii

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TM 55-1520-236-23

NUMBER

5-285-28.15-28.25-28.35-28.45-28.55-28.6

5-28.75-28.85-28.95-28.105-28.115-28.12

5-28.135-28.145-28.155-28.165-295-305-315-325-335-345-355-365-375-38

5-38.1

5-395-405-40.15-40.25-415-425-42.1

5-435-445-455-465-475-485-495-505-515-525-52.1

viii

LIST OF ILLUSTRATIONS (CON’T)

TITLE

Typical Double Plug Patch Repair (K747 Blade) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Application of Trailing Edge Doubler Patch (K747 Blade) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Spline Repair (K747 Blade) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..Rebonding Delaminated Leading Edge Erosion Guard (K747 Blade) .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Typical Repair of Fluorocarbon Erosion Guard Nicks and Cuts Using Kit, P/N 747-207 . . . . . . . . . . .Application of Leading Edge Erosion Guard Patch (K747 Blade) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Placement of Erosion Guard Replacement Part (Kit, P/N K747-206- 1 ) Method for Determining

Current Boot Material and Thickness (K747 Blade Series) . . . . . . . . . . . . . . .K747 Blade Uralite Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................Application of Vacuum Bagging Materials and Placement of Erosion Guard . . . . . . . . .Repair Parts and Specimen Orientation (Kit, P/N K747-206) .. . . .. . . . . . . . . . . . . . .Vacuum Bagging for Installation of Erosion Guard Repair Kit, P/N K747-206 . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . .Improvised Mold for Casting a Small Section of Leading Edge Filler .. . . . . . . . . . .Repair Parts Orientation Use for Removal and Installation of Stainless Steel Erosion Guard -

K747-003-303M03 and -303/-403 Field Modified Blades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Preparation of K747-003-303/-403 Blade for Application of Sealant . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Application of Sealant to Stainless Steel Guard for K747-003-303/-403 Blade . . . . . . . . . . .Stainless Steel Erosion Guard Holding Fixture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Masking for Paint Touch-Up After Installation of Kit K747-206 .. . . . .. . . .. . . . . . . . . . . . . . . . .Main Rotor Hub Yoke Extension and Grip AssemblyMain Rotor Hub Yoke and Trunnion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...............Main Rotor Bearing Wear Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............Damage Limits - Main Rotor Hub Yoke Extension . . . .Damage Limits - Main Rotor Hub Bolt Holes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits - Main Rotor Hub Yoke . . . . . . . . . . . . . . . . . . . .. . .. . . . . . . . . . . . . . . Damage Limits - Main Rotor Hub Grip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Damage Limits - Main Rotor Hub Strap Fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits - Pitch Horn Bushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Damage Limits - Main Rotor Hub Pitch Horn 209-010- 109-5

(Prior to Accomplishment of MWO 55-1520-244-50-6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . .Damage Limits - Main Rotor Hub Pitch Horn 209-010-109-109

(After Accomplishment of MWO 55-1520-244-50-6 and MWO 55-1520-244-50-9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits - Main Rotor Drag Brace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits - Main Rotor Hub Trunnion . . . .Damage Limits - Hub Moment Spring Plate . . . . . . . .Damage Limits - Hub Moment Spring Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits - Main Rotor Hub Elastomeric Bearing . . . .Main Rotor Hub Yoke Chafing Pad Installation Dimensions .Main Rotor Hub Yoke Buffer Installation - Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tool Application - Bearing Removal From Housing . . .Tool Application - Bearing Removal From Grip . . .Tool Application - Bearing and Seal Installation in Grip . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tool Application - Main Rotor Hub Trunnion Centering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tool Application - Grip Spacing Adjustment . . . . . .Main Rotor Hub Grip Dust Seal to Radius Ring Dimension . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Rotor Balancing Kit P/N 7A050 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tool Application - Main Rotor Hub Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Main Rotor Controls Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tool Application - Spline Plate Wear Measurement . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Hub Moment Spring Suppon Assembly - Installation (MWO 55-1520-244-50-3 Incorporated)

Change 20

PAGE

5-675-685-715-72.15-72.35-72.5

5-72.75-72.105-72.115-72.155-72.185-72.21

5-72.235-72.245-72.265-72.275-72.315-72.355-745-775-785-795-815-825-835-85

5-86

5-86.15-875-885-88.15-88.25-895-905-905-90.25-925-935-965-975-995-1015-1025-1045-1075-108

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TM 5-1520-236-23

LIST OF ILLUSTRATIONS (CONT)

NUMBER5-535-53.15-53.25-54

5-54.1

5-555-565-575-585-595-605-615-625-635-63.1

5-63.25-645-655-65.15-65.25-665-675-685-695-705-715-725-735-745-755-765-775-785-795-805-815-825-835-845-85

PAGE5-108.15-108.45-108.5

5-109

5-110.15-110.25-1115-1125-1135-1145-1155-1165-1175-118

5-120.25-120.35-1215-1245-130.15-130.15-1325-1355-1395-1445-1465-1505-1515-1525-1535-1555-1565-1605-1615-1625-1635-1645-1655-1665-1675-168

Change 21 viii.1/(viii.2 blank)

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TM 55-1520-236-23

NUMBER5-865-875-885-895-905-915-925-935-945-955-965-975-985-995-1005-1015-1025-1035-1045-1055-1065-1075-108

LIST OF ILLUSTRATIONS (CONT)

PAGE5-1695-1715-1725-1735-1745-1765-1785-1825-1835-1855-1875-1885-1895-1915-1945-1955-1965-1985-2005-2015-2025-2035-204

Change21 ix

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TM 55-1520-236-23

NUMBER5-1095-1105-1115-1125-1135-1145-1155-1165-1176-16-26-2.16-2.26-36-46-56-66-76-7.16-86-96-9.16-9.26-9.36-9.46-106-116-12

6-136-146-158-15.16-166-16.16-16.26-16.36-176-186-196-206-216-22

6-236-246-24.16-24.26-256-266-276-286-296-306-31

PAGE 5-205

5-2085-2095-210 5-2125-2145-2155-2176-46-56-6.3

6-86-106-116-136-14.16-176-186-206-20.16-20.26-20.26-20.36-256-276-29

6-45.1

6-326-346-416-44.1

6-46.16-46.26-46.36-476-506-536-566-586-596-626-646-656-666-66.16-686-696-736-766-776-81

x Change 21

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TM 55-1520-236-23

NUMBER6-326-336-346-356-35.16-366-376-386-396-406-416-426-436-44

6-45

6-45.16-45.26-466-476-486-496-506-50.16-516-526-536-546-55

LIST OF ILLUSTRATIONS (CONT)

PAGE6-826-856-876-886-90.26-916-996-1036-1056-1066-1086-1156-116

6-119

6-1206-120.26-120.26-1266-1276-1296-1316-1326-132.26-1356-1376-1386-1396-140

Change 21 x.1/(x.2 blank)

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TM 55-1520-236-23

NUMBER6-566-576-586-596-606-616-626-636-646-656-666-676-67.1

6-67.26-686-696-707-1

7-2

7-37-47-5

7-67-77-87-97-10

7-117-127-13

7-147-157-167-17

7-187-197-207-217-227-22.1

PAGE6-1416-1426-1436-1446-1466-1476-1486-1496-1496-1506-1516-153

6-154.36-154.46-1556-1586-159

7-3

7-87-97-28

7-297-317-377-417-42

7-437-467-47

7-497-527-537-55

7-597-617-627-637-667-677-68.4

Change 21 xi

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TM 55-1520-236-23

NUMBER7-22.27-237-247-25

7-26

7-277-28

7-29

7-30

7-31

7-32

7-337-347-357-367-377-387-39

7-40

7-41

7-42

7-43

8-18-28-2.18-2.28-38 -48-5

8-5.18-5.28-5.38-6

9-1

9-2

9-3

9 -4

PAGE7-68.67-737-75

7-807-81

7-817-84

7-92

7-95

7-98

7-98

7-997-1027-1047-1057-1077-1087-109

7-111

7-117

7-144

7-149

8-28-26.38-26.48-26.58-428-43

8-448-44.48-44.58-44.68-49

9-2

9-3

9-4

9-6

xii Change 21

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TM 55-1520-236-23

LIST OF ILLUSTRATIONS (CON'T)

NUMBER

9-5

9-6

9-7

9-8

9-9

9-109-11

9-12

9-13

9-149-14.1

9-159-15.1

9-16

9-179-17.19-17.29-17.39-17.49-17.59-17.69-17.79-17.89-17.9

TITLE PAGE

9 - 89-10

9-13

9-13

9-18

9 - 2 09 - 2 3

9 - 6 6

9-80.1

9-80.1

9-81

9-82.1

9-82.1

9-88.79-88.89-88.119-88.11

9-88.129-88.169-88.179-88.19

Change 21 xii.1/(xii.2 bIank)

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TM 55-1520-236-23

NUMBER

9-17.109-17.119-17.129-17.139-189-18.19-18.29-18.39-199-209-219-229-239-249-259-269-279-289-299-309-319-329-3310-110-210-310-410-4.110-4.210-510-610-711-111-211-311-411-511-611-711-811-911-1011-1111-1211-13

LIST OF ILLUSTRATIONS (CON’T)

TITLE PAGE

Position of Contacts in Latch Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-88 .23Gunners Caution Panel Schematic Diagram 9-88.25Gunners Caution Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-88.32Gunners Caution Panel Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . 9-88.35BHC Model RPM Warning Control.. . . . . . . . . . . . . . . . . . . . . . . . . . ...9-18.1Saturn Model RPM Limit Warning Detector . . . . . . . . . . . . . . . . . . . . . . . . . 9-18.1Cables for Alignment of RPM Limit Warning Detector . . , . . . . . . . . . . . . . . . . . 9-92.2Bench Test Set Up for BHT 205-074-033-101 RPM Limit Warning Detector . . . . . . . . 9-93

Armament Equipment Location . . . . . . . . . . . . . . . . . . . . . . . . . . ...9-128TOW Missile Launcher Positions . . . . . . . . . . . . . . . . . . . . . . . . . ...9-131Wing Stores Armament Test Panel . . . . . . . . . . . . . . . . . . . . . . . . ...9-139Wing Stores Armament Test Panel Schematic . . . . . . . . . . . . . . . . . . . . . 9-140Armament Equipment Location . . . . . . . . . . . . . . . . . . . . . . . . . . ...9-155TOW Missile Launcher Positions . . . . . . . . . . . . . . . . . . . . . . . . . ...9-164

DU Digital Display Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...9-173 LRU Fault Identification and Location Test . . . . . . . . . . . . . . . . . . . . . . .9-173 XM18 Minigun Circuitry Test Panel . . . . . . . . . . . . . . . . . . . . . . . . . .. 9-175 Wing Stores Circuitry Test Panel . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9-180 TOW Missile Launcher Positions . . . . . . . . . . . . . . . . . . . . . . . . . . ..9-195 DU Digital Display Test, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...9-204 LRU Fault Identification and Location Test . . . . . . . . . . . . . . . . . . . . . .9-204 XM18 Minigun Circuitry Test Panel . . . . . . . . . . . . . . . . . . . . . . . . . .. 9-206 Wing Stores Circuitry Test Panel . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9-211

Fuel Systems Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...10-3Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...10-4Fuel Shutoff Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...10-9Fuel Boost Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...10-12.1Fuel Boost Pump Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...10-12.2Work Aid for Fuel Pump Cartridge Removal . . . . . . . . . . . . . . . . . . . . . . . . . 10-12.3Collapsing Forward Fuel Cell 10-22Installed Forward Fuel Cell . 10-24Collapsing Aft Fuel Cell..... . . . . . . . . . . . . . . . . . . . . . . . . . ..10-26Collective Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...11-4Pilot Collective Stick installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...11-8Pilot Collective Stick Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...11-9Bearing installation -Pilot Throttle Grip . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-14Friction Lining Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...11-16ThrottIe Lever Bearing installation . . . . . . . . . . . . . . . . . . . . . . . . . . . ...11-17Collective Friction Tube Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...11-18Pilot Collective Stick Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-20Gunner Collective Stick installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-22Gunner Collective Stick-Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . ..11-25Gunner Collective Stick Adjustment . . . . , . . . . . . . . . . . . . . . . . . . . . . . . 11-27Force-And-Aft Cyclic Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...11-30Lateral Cyclic Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...11-32Work Aid for Rigging Swashplate. . . . . . . . . . . . . . . . . . . . . . . . . . . ...11-3411-14

Change 18 xiii

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TM 55-1520-236-23

NUMBER

11-1511-1611-1711-1811-1911-2011-2111-2211-2311-2411-2511-2611-2711-27.111-2811-2911-3011-3111-3211-3311-3411-3511-3611-3711-3811-3912-112-212-312-412-512-613-113-213-313-413-513-613-6.113-713-813-913-1013-1113-1213-1313-1413-1513-1613-1713-1816-116-2

LIST OF ILLUSTRATIONS (CON’T)

TITLE

Swashplate Rigging Dimensions . . . . . . . . . . . . . . . . . . . . . .Pilot Cyclic Stick Installation . . . . . . . . . . . . . . . . . . . . . . . .Pilot Cyclic Stick Assembly . . . . . . . . . . . . . . . . . . . . . . . .Collar and Bushing Installation . . . . . . . . . . . . . . . . . . . . . . .Pilot Cyclic Stick Friction Adjustment . . . . . . . . . . . . . . . . . . .Gunner Cyclic Stick Installation . . . . . . . . . . . . . . . . . . . . . .Gunner Cyclic Stick Assembly . . . . . . . . . . . . . . . . . . . . . . .Fore-And-Aft Cyclic Jackshaft Installation . . . . . . . . . . . . . . . . .Force Gradient Assembly . . . . . . . . . . . . . . . . . . . . . . . . .Tail Rotor Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tail Rotor Pedal Installation . . . . . . . . . . . . . . . . . . . . . . . .

Stability and Control Augmentation System (SCAS) . . . . . . . . . Stability and Control Augmentation System (SCAS) . . . . . . . .

SCAS Transducer Calibration . . . . . . . . . . . . . . . . . . . . . . .Elevator Control System . . . . . . . . . . . . . . . . . . . . . . . . . .Elevator Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits - Fixed Length Flight Control Tubes and Links (Typical) .Control System Linkage Installation . . . . . . . . . . . . . . . . . . . .Damage Limits - Anti-Torque System . . . . . . . . . . . . . . . . . . .Damage Limits - Elevator Control System . . . . . . . . . . . . . . . . .Damage Limits - Collective Control System . . . . . . . . . . . . . . . .Damage Limits - Cyclic Control System . . . . . . . . . . . . . . . . . .Flight Control System Bearings . . . . . . . . . . . . . . . . . . . . .Lateral Cyclic and Collective Controls Power Cylinder Support InstallationFore-And-Aft Cyclic Controls Power Cylinder Support Installation . . . .Damage Limits - Power Cylinder Supports . . . . . . . . . . . . . . . .Engine Fire Detection System . . . . . . . . . . . . . . . . . . . . . . .Low G Warning System . . . . . . . . . . . . . . . . . . . . . . . . . .Low G Warning Assembly 8A10 . . . . . . . . . . . . . . . . . . . . . .Accelerometer 8A 111 . . . .Low G Warning Light/Switch 8DS25 Converter 8M1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Environmental Control System . . . . . . . . . . . . . . . . . . . . . . .Environmental Control Unit . . . . . . . . . . . . . . . . . . . . . . . .Environmental Control System Schematic . . . . . . . . . . . . . . . . .Temperature Control Valve . . . . . . . . . . . . . . . . . . . . . . . . .Temperature Control Valve Schematic . . . . . . . . . . . . . . . . . . .ECU Cooling Turbine . . . . . . . . . . . . . . . . . . . . . . . . . . .ECU Cooling Turbine Lubrication . . . . . . . . . . . . . . . . . . . . .Pressure Regulator and Shutoff Valve . . . . . . . . . . . . . . . . . . .Pressure Regulator and Shutoff Valve Schematic . . . . . . . . . . , . .Blower Impeller Assembly . . . . . . . . . . . . . . . . . . . . . . . . .Vent Air Control Valve - Installation . . . . . . . . . . . . . . . . . , . .Vent Air Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . .Vent Air Control Valve Test Set-Up . . . . . . . . . . . . . . . . . . , . .Rain Removal Manifold . . . . . . . . . . . . . . . . . . . . . . . . . .Rain Removal Thermal Switch-Installation . . . . . . . . . . . . . . . .Rain Removal Nozzle and Cleared Air Pattern . . . . . . . . . . . . . .Rain Removal Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . .Limits Chart -Air Distribution Valve . . . . . . . . . . . . . . . . . . . .Tool Application - Teflon Lip Seal Installation . . . . . . . . . . . . . . .

Turret lnstallation . . . . . . . . . . . . . . . . . . . . . . . . . .Special Tools for Ejector Racks . . . . . . . . . . . . . . . . . . . . . .

xiv Change 16

PAGE

. . . . . . . . . 11-35

. . . . . . . . . 11-36

. . . . . . . . . 11-40

. . . . . . . . . 11-42

. . . . . . . . . 11-44

. . . . . . . . . 11-46

. . . . . . . . . 11-48

. . . . . . . . . 11-51

. . . . . . . . . 11-56.1

. . . . . . . . . 11-57

. . . . . . . . . 11-62

. . . . . . . . . 11-70

. . . . . . . . . 11-71

. . . . . . . . . 11-74.2

. . . . . . . . . 11-76

. . . . . . . . . 11-79

. . . . . . . . . 11-82

. . . . . . . . . 11-85

. . . . . . . . . 11-95

. . . . . . . . . 11-102

. . . . . . . . . 11-104

. . . . . . . . . 11-110

. . . . . . . . . 11-118

. . . . . . . . . 11-119

. . . . . . . . .

. . . . . . . . .

. . . . . . . . .

. . . . . . . . .

. . . . . . . . .

. . . . . . . . .

11-12011-12112-312-512-912-10

. . . . . . . . . 12-12

. . . . . . . . . 12-13

. . . . . . . . . 13-3

. . . . . . . . . 13-5

. . . . . . . . . 13-7

. . . . . . . . . 13-8

. . . . . . . . . 13-9

. . . . . . . . . 13-12

. . . . . . . . . 13-12.1

. . . . . . . . . 13-14

. . . . . . . . . 13-16

. . . . . . . . . 13-18

. . . . . . . . . 13-21

. . . . . . . . . 13-22

. . . . . . . . . 13-24

. . . . . . . . . 13-28

. . . . . . . . . 13-30

. . . . . . . . . 13-31

. . . . . . . . . 13-34

. . . . . . . . . 13-36

. . . . . . . . . 13-38

. . . . . . . . . 16-4

. . . . . . . . . 16-12

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TM 55-1520-236-23

LIST OF ILLUSTRATIONS (CON’T)NUMBER TITLE16-316-416-516-616-6.116-6.216-716-816-917-117-2C-lF-lF-1.1F-1.2F-2F-3F-4F-5F-6F-7F-8F-9F-10F-11F-12F-13F-14F-15F-16F-17F17.1F-18F-l8 1F-19F-20F-21F-22F-23F-24F-25F-26F-27F-28F-29F-30F-31F-32F-33F-34F-35F-36F-36.1

Outboard Ejector Rack Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ejector Rack Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Outboard Ejector Rack Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Inboard Ejector Rack Installation. . . . . . . . . . .

. . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contact Profusion Inside Breech . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Wiring Harness Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Inboard Ejector Rack Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Wing Stores Pylon and Fairings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AIM-1/EXL Laser Installation.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Canopy Removal System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits- Linear Shaped Charge Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Inventory Item List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Wiring Identification Chart.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Symbols Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Altimeter Vibrator System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .External Power System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Starter System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ignition System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Anticollision and Position Lights System Wiring Diagram . . . . . . . . . . . . . . . . . . . .Searchlight System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Engine De-Ice System Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Fuel Valve and Oil Valve System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .Fuel Boost System Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Governor Control System Wiring System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Idle Stop System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Force Trim System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Environmental Control System Wiring Diagram, . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Pitot Heater System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TOW Blower Cooling System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Attitude Indicating System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FUEL Quantity Indicating System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . .

Turn and SIip Indicating System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radio Blower Cooling System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Armament Relay Lucatlon. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Altimeter Vibrator System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . External Power System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Starter System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...... Searchlight System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine De. Ice System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel Valve and Engine Oil Valve System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . Fuel Boost System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... Governor Control System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle Stop System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... Force Trim System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Environmental Control System Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pitot Heater System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TOWBlower Cooling System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radio Blower Cooling System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Attitude Indicating System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel Quantity Indicating System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PAGE16-2116-2416-2716-3216-32.116-32.216-3416-3516-3817-217-4C-3F-5F-6

F-45F-47F-49F-50F-51F-52F-53F-54F-55F-56F-57F-58F-59F-60F-6lF-63F-64F-65F-65F-66F-67F-83F-85F-87F-89F-9OF-91F-92F-93F-94F-95F-97F-98F-99

F-100F-1OIF-102

Tachometer Indicating System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-103 Centrisep Particle Separator Wiring Diagram (After Incorporation of

MW0 55-1520-236-50-12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-104

Change 19 xv

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TM 55-1520-236-23

LIST OF ILLUSTRATIONS (CON’T)

NUMBER TITLE PAGE

F-37F-38F-38.1F-39F 4 0F-41F-42F-43F-44F-45F-46F-47F-48F-49F-50F-51F-52F-53F-54F-55F-56F-57F-58F-59F-60F-61F-62F-63F-64F-65F-66F-67F-68

F-69F-70F-71F-71.1

F-72F-73F-74F-75F-76

F-77F-78F-79F-80

FO- 1FO-2FO-3FO-4FO-5FO-6

Turn and Slip Indicating System Wiring Diagram....................... Electrical Equipment Component Replacement Wiring Diagram . . . . . . . . . . . . . . . . F-106

Armament Relay Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-106.1AC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-108DC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-109Tachometer Indicating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-110Pressure Indicating Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-121Temperature Indicating Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-131Attitude Indicating System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-141Turn and Slip Indicating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-147Fuel Quantity Indicating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-151Altimeter Vibrator System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-160DC Generator Power System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . F-167Battery System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-177External Power Provisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-184DC Power Distribution and Interconnect Logic (Equipment Location) . . . . . . . . . F-189AC Power System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-197Stafier System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-207IgnitionSystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-213Interior Lights System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-221Caution Lights System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-235RPM Limit Warning System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . F-259Position Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-269Anticollision Light System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-276 Searchlight System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-279Engine De-Ice System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-284Fuel Valve and Engine Oil Bypass Valve Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-292Fuel Boost System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-300Governor Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-307Idle Stop System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-316Force Trim System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-322Hydraulic Control System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-331Environmental Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-341

Pitot Heater System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-350TOW Blower Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-354Radio Blower Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-361

Centrisep Particle Separator Wiring Diagram (After Incorporationof MWO 55-1520-236-50-12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-366.1

Universal Turret Subsystem (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . F-367TOW Missile Armament Subsystem (Equipment Location) . . . . . . . . . . . . . . . . . . . F-383Fire Control System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-399Wing Stores Armament Subsystem (Equipment Location) . . . . . . . . . . . . . . . . . . . . F-413Electricd Equipment Component Replacment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-425Electrical Equipment Component Replacement (After MWO 55-1520-236-50-4) . . . F-466

C-NITE Subsystem (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-469C-NITE Electrical Equipment Component Replacement . . . . . . . . . . . . . . . . . . . F-471FLIR Subsystem Jumper Cable Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-472

Hydraulic System Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-1 Hydraulic System Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-2

Balancer and Strobex Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-3AC Electricl Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-4AC Electricd Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-5ACElecWicd Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-6

F - 1 0 5

XVI Change 19

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TM 55-1520-236-23

NUMBERFO-7FO-8FO-9FO-10FO-11FO-12FO-13FO-14FO-15FO-16FO-17

LIST OF ILLUSTRATIONS (CON’T)

TITLE

AC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Battery System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PAGE

FO-7FO-8FO-9

FO-10FO-11FO-12FO-13FO-14FO-15FO-16FO-17

Change 16 xvi.1/(xvi.2 blank)

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TM 55-1520-236-23

LIST OF ILLUSTRATIONS (CON’T)

NUMBER

FO-18FO-19FO-20FO-21FO.21.lFO-22FO-22.1FO-23FO-24FO-25FO-26FO-27FO-28FO-29FO-30FO-31FO-32FO-33FO-34FO-35FO-36FO-37FO-38FO-39FO-40FO-41FO-42FO-43FO-44FO-45FO-46FO-47FO-48FO-49FO-50FO.50.1FO-51FO-51.1FO-52FO-53FO-54FO-55FO-56FO-57FO-58FO-59FO-60FO-61FO-62FO-63FO-64

TITLE PAGE

Generator and DC Bus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-18AC Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-19 Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-20Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-21

Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO.21.1

Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-22

Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-22.1

Caution Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-23

Caution Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-24

RPM Limit Warning System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-25Hydraulic Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-26

Armament Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-27

Armament Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-28Armament Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-29Armament Wing Stores System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-30Armament Wing Stores System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-31Armament Wing Stores System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-32Armament TOW Missile Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-33Armament TOW Missile Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-34Armament TOW Missile Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-35Armament TOW Missile Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-36Pressure Indicating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-37Tachometer Indicating Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-38Temperature Indicating Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-39RPM Limit Warning Test Set Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-40

AC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-41DC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-42DC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-43

attery System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-44DC Generator Power System.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-45DCPower Distribution and Interconnect Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-46DC Power Distribution and Interconnect Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-47AC Power System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-48Ignition System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F O - 4 9Interior Lights System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-50Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-50.1

Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-51Interior Lights System . . . . . . . . . . . . . . . . . . . . . . FO-51.1

Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-52

Caution Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-53

Caution Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-54RPM Limit Warning System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anticollision and Position Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FO-55FO-56

Hydraulic Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-57Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-58

Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-59Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-60Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. FO-61Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... FO-62Turret System . . FO-63Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-64

Change ll xvii

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TM 55-1520-236-23

NUMBER

FO-50

FO-50.1

FO-51

FO-51 .1

FO-52

FO-53

FO-54

FO-54.1

FO-54.2

FO-54.3

FO-54.4

FO-55

FO-56

FO-57

FO-58

FO-59

FO-60

FO-61

FO-62

FO-63

FO-64

FO-65

FO-66

FO-67

FO-68

FO-69

FO-70

FO-71

FO-72

FO-73

FO-74

FO-75

FO-76

FO-77

LIST OF ILLUSTRATIONS (CONT)

TITLE PAGE

Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-50

Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-50.1

Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-51

Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-51.1

Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-52

Caution Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-53

Caution Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-54

Caution Lights System (After Incorporation of MWO 1-1520-236-50-30) . . . . . . . . .FO-54.1

Caution Lights System (After Incorporation of MWO 1-1520-236-50-30) . . . . . . . . . FO-54.2

Caution Lights System (After Incorporation of MWO 1-1520-236-50-30) . . . . . . . . . FO-54.3

Caution Lights System (After Incorporation of MWO 1-1520-236-50-30) . . . . . . . . . FO-54.4

RPM Limit Warning System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-55

Anticollision and Position Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-56

Hydraulic Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-57

Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-58

Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-59

Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-60

Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-61

Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-62

Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .FO-63

Turret System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-64

Wing Stores System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-65

Wing Stores System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-66

Wing Stores System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-67

TOW Missile System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-68

TOW Missile System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-69

TOW Missile System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-70

TOW Missile System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-71

TOW Missile System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-72

TOW Missile System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-73

TOW Missile System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-74

TOW Missile System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-75

TOW Missile System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-76

TOW Missile System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-77

xviii Change 21

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TM 55-1520-236-23

NUMBER

FO-78

FO-79

FO-80

FO-81

FO- 81.1

FO-82

FO-83

FO-84

FO-85

FO-86

FO-87

FO-88

FO-89

FO-80

FO-91

FO-92

FO-93

FO-94

FO-95

FO-96

FO-97

FO-98

FO-99

FO-100

FO-100.1

FO-101

FO-101.1

FO-102

FO-102.1

FO-103

FO-104

FO-105

FO-106

FO-107

FO-108

FO-109

FO-110

LIST OF lLLUSTRATlONS (CONT)

TITLE PAGE

Pressure Indicationg Sytem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-78

Temperature Indicating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-79

Electrical Equipment Component Repalcement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-80

Electrical Equipment Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-81

Electrical Equipment Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-81.1

Electrical Equipment Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-82

Electrical Equipment Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-83

Electrical Equipment Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-84

Electrical Equipment Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-85

EIectrical Equipment Component Replacement. . . . . . . . . . . . . . . . . . . . .FO-86

Electrical Equipment Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-87

Electrical Equipment Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-88

Electrical Equipment Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-89

Electrical Equipment Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-80

Pressure Indicating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-91

Temperature Indicating Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-92

Attitude Indicating Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-93

DC Generator Power System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-94

Battery System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-95

DC Power Distrubution and Interconnect Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-96

DC Power Distrubution and Interconnect Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-97

AC Power System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-98

Ignition System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-99

Interior Lights Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-100

lnterior Lights Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-100.1

lnterior Lights Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-101

Interior Lights Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-102

Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-102.1Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-102.1

Interior Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-103

Caution Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-104

Caution Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-105

RPM Limit Warning System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-106

RPM Limit Warning System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-107

Hydraulic Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-108

Universal Turret Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-109

Universal Turret Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-110

Change 21 xviii.1

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TM 55-1520-236-23

LIST OF ILLUSTRATIONS (CONT)

NUMBER TITLE PAGE

FO-111

FO-112

FO-113

FO-114

FO-115

FO-116

FO-117

FO-118

FO-119

FO-120

FO-121FO-122

FO-123

FO-124

FO-125

FO-126

FO-127

FO-128

FO-129

FO-130

FO-131

FO-132

FO-133

FO-134

FO-135

FO-136

FO-137

FO-138

FO-139

FO-140

FO-141

FO-142

FO-143

FO-144

FO-145

FO-146

FO-147

Universal Turret Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-111

Universal Turret Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-112

UniversalTurret Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-113

Universal Turret Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-114

Universal Turret Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-115

Universal Turret Subsytem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-116

Universal Turret Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-117

Universal Turret Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-118

TOW Missile Armament Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-119

TOW Missile Armament Subsytem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-120

TOW Missile Armament Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-121

TOW Missile Armament Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-122

TOW Missile Armament System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-123TOW Missile Armament Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-124

TOW Missile Armament . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FO-125

FO-126

FO-127

FO-128

FO-129

FO-130

FO-131

FO-132

FO-133

FO-134

FO-135

FO-136

FO-137

FO-138

FO-139

FO-140

FO-141

FO-142

FO-143FO-199

FO-211

FO-213

FO-215

xviii.2 Change 21

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TM 55-1520-236-23

LIST OF TABLES

NUMBER1-11-21-31-41-51-61-71-81-91-101-111-11.11-122-12-22 -3

2 -42 -54-14-1.14-1.24-24-2.14 -35-15-1.15-1.25-25 -35 -46-16-1.16-1.26-26 -37-17-2

7-3

7 -47-4.17-4.27-4.37-5

PAGE1-31-41-10.11-191-24.11-24.1

1-24.21-54.11-892-132-172-26

2-692-2484-434-44.44-44.84-514-54.54-675-345-455-495-585-1405-218

Change 22

6-26-6.26-6.46-80.16-1227-11

7-15

7-207-347-68.37-68.67-68.7

7-71

xix

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TM 55-1520-236-23

LIST OF TABLES (CONT)

NUMBER7-6

7-7

7-8

7 -9

7-10

7-117-12

7-13

7-14

8-18-2

8 -38 -48-4.18-4.2

8-4.38 -58 -68 -78-88-98-108-118-128-13

9-19-29 -3

9 -4

9-4.19 -5

9 -6

9 -7

9 -8

9 -9

9-10

PAGE

7-76

7-77

7-79

7-94

7-957-97

7-122

7-125

7-1428-8

8-148-208-228-268-26.1

8-26.18-298-308-328-348-388-398-438-48

8-519-299-34

9-37

9-419-44.2

9-46

9-49

9-50

9-58

9-629-74

xx Change 21

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TM 55-1520-236-23

NUMBER9-119-12

9-12.19-139-148-158-15.19-15.29-15.39-15.49-15.59-166-16.19-16.29-179-189-199-209-219-229-239-249-259-269-26.1

9-279-289-299-309-319-329-32.1

9-32.2

9-32.3

9-32.4

9-32.5

9-32.6

9-32.7

9-32.8

TITLE PAGE

Troubleshooting - Ignition System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-75 . 9-77

Troubleshooting - Console, Engine, Flight, and Tactical Instrument Lights . . . . . . . . . . . . . . . . 9-79Pilot Caution Panel Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-83Gunners Caution Panel Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-83Troubleshooting Pilots Caution Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-88.2Pilots Caution Panel Wiring Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-88.21Gunners Caution Panel Fault Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-88.27Troubleshooting - Gunners Caution Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-88.28Gunners Caution Panel Waring Craft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-88.36Troubleshooting -RPM Limit Warning System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-91Troubleshooting -Skid Landing Light System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-94.1Troublesgooting - ODDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-94.3Troubleshooting -Position Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-95Troubleshooting - Anticollision light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-98Troubleshooting - Searchligt System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-100Troubleshooting - Transmission Oil Level Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-102

Troubleshooting - Engine De-Icing Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-103Troubleshooting - Engine Oil Bypass valve Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-105Troubleshooting - .Fuel Valve Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-106Troubleshooting - Fuel Boost Pumps Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-107Troubkshooting - Governor Control Circiutry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-108Troubleshooting - Odle Stop Solenoild System Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-110

9-78.1

of MWO 55-1520-236-50-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-110.1Troubleshooting -Force Trim System Circuity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-111Troubleshooting -Hydraulic Control System Circuity . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-113Troubleshooting -Environmental Control System Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-115Troubleshooting -Pitot Heating System Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-117Troubleshooting -TOW Blower Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-118Troubleshooting -Radio Blower Wing System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-121

Relay Matrix, Pilot in Control Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-122-1

Relay Matrix, Pilot in Fixed Forward Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-122.3

Relay Matrix, Gunner in Control Mode - HSS controlling Turret . . . . . . . . . . . . . . . . . . 9-122-5

Relay Matrix, Gunner in Control Mode- TSU Controlling Turret . . . . . . . . . . . . . . . . . . 9-122.7

Relay Matrix, Gunner Controlling TOW and Pilot Controlling Turret and Wing StoresMode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-122.9

Relay Matrix, TSU Acquisition of Target with Gunner or Pilot HSS Mode 9-122.11

Relay Matrix TSU Acquisition of Target with Gunner or Pilot HSS Mode 9-122.13

Relay Matrix, Gunner Jettison Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-122-15

Change 21 xxi

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TM 55-1520-236-23

NUMBER9-32.9

9-33

9-34

9-35

9-36

9-36.1

8-36.2

8-36.3

9-36.4

9-36.5

9-36.6

9-36.7

9-36.8

9-37

9-38

9-39

9-40

9-41

9-42

9-43

8-44

10-111-112-112-213-113-216-1

16-2

16-3

F-1

F-2

F-3

F-4

F-5

LIST OF TABLES (CONT)

PAGE

9-122.16

9-143

9-145

9-150

9-152

9-156.1

9-156.3

9-156.5

9.156.7

9-156.11

9-156.13

9-156.14

9-176

9-177

9-181

9-183

9-207

9-208

9-212

9-214Troubleshooting - Fuel System 10-1

11-1Troubleshooting - Engine fire Detection System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1

12-6Troubleshooting-ECU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..13-1Troubleshooting -Rain Removal Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-32

16-13

16-16

16-39

F-9

F-15

F-19

F-26

F-32

F-6 F-39

xxii Change 21

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H Y D R A U L I C

CHAPTER 7

A N D P N E U M A T I C S Y S T E M

7 - 1 . H Y D R A U L I C S Y S T E M .

NOTE

Refer to paragraph 7-145 for descriptionof hydraulic system for helicopters coded

and helicopters coded

7 - 2 . D E S C R I P T I O N – H Y D R A U L I CSYSTEM.

a. Two similar but separate hydraulic systems areused to operate f l ight control power cylinders,stability and control augmentation system (SCAS)servoactuators, the armament turret, and the TOWmissile launcher actuator. A schematic diagram of

the hydraulic system for helicopters coded isshown on figure FO-1 (foldout page FO-1 ). SystemNo. 1 and No. 2 are exactly alike as to their reservoirs,transmission driven pumps, and module assemblieswhich contain system filters, solenoid valves, reliefvalves and pressure switches for the caution panels.Although both systems operate three dual servohydraulic cylinders in main rotor controls there is noconnection between systems because they separatepassages and piston chambers inside each dualcylinder and valve assembly. Both systems and theemergency system also have other hydraulic circuitsand functions different and separate from each other.

b. An emergency system is provided to enable thepilot to execute a landing in the event that pressure islost in both System No. 1 and System No. 2. Theemergency systems consists b a s i c a l l y o f apressurized lockout valve, a pressure operatedshutoff valve, solenoid operated shutoff valve, andcheck valves. See schematic diagram, figure FO-1(foldout page FO-1). If the pressure in hydraulicSystem No. 1 should fall to 650 psig for any reason,the pressurized lockout valve and the pressureoperated shutoff valve will close, locking 650 psigon both pressure and return sides of the servo-actuators. This is done to ensure that the actuatorsremain full of oil and free of air. A small accumulator,1.0 cubic inch, is connected to the pressurizedlockout valve to make up normal leakage of the cyclicactuators and to help maintain the 650 psig trappedin the actuators. The pilot can then move the flight

controls by engaging the mechanical stops on theservo-actuators and moving the cylinders throughdirect mechanical coupling and internal irreversiblevalving. When the pilot moves the servo-actuatorwith no hydraulic pressure available, the fluid ismoved from one side of the actuator to the otherthrough flow passages in the actuator head. Whenthe feed-back forces exceed the pressure setting ofthe differential relief valve, the valve wil l open,allowing a slight amount of fluid bypass through theactuator pressure to actuator return passages. Thiswill warn the pilot of an overloading condition.

c. An emergency system is provided to furnishhydraulic power to the collective hydraulic cylinderwhen pressure is lost in System No. 1 and System No.2. The emergency system consists basically of anelectric driven pump, reservoir, solenoid valves, filter,check valves, and pressure switch. The system is alsoused to power turret and wing, pylon armamentsystems for boresight capability without hydraulictest stand. The description of the emergency systemin paragraph b is applicable to the cyclic controlhydraulic cyl inders and to the collective controlhydraulic cylinder except that when the emergencyelectric hydraulic pump switch is posit ioned to“emergency” hydraulic fluid under pressure will be

supplied to the collective cylinder. The remainder ofSystem No. 2 will be closed off by solenoid valves. Theprimary purpose of the emergency systems is toensure that hydraulic power is furnished to theco l lec t ive hydrau l ic cy l inder . The p i lo t cannotmaintain collective c o n t r o l w i t h o u t h y d r a u l i cpressure at the collective hydraulic cylinder.

d. In the event of a dual hydraulic system andstarter/generator failure, the emergency electricalsystem, with a fully charged battery, is capable ofsupplying the essential bus loads for at least 17.8minutes, with the emergency hydraulic pump beingused during low speed flight prior to landing, and,during landing operations not to exceed 5 minutes.

7 - 3 . O P E R A T I O N A L C H E C K A N DTESTING – HYDRAULIC SYSTEM.

The following principles of operation of System No. 1,System No. 2, and emergency system inform themechanic how each system funct ions pr ior to

7-1

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per forming tes t ing and operat iona l checks o fhydraulic systems after maintenance requirementshave been accomplished.

a. Principles of Operation (typical for bothsystems).

In normal operation of each system, hydraulic fluid issupplied from its nonpressurized reservoir by gravityfeed and suction to a transmission-driven pump. Thepump is a variable-displacement type with internalpressure compensation, preset to provide 1500 (plusor minus 25) psi output pressure and 6.1 gpm flowrate at operating rpm, according to system demands.Fluid bypassed in pump, to regulate pressure andflow, is released through a line to the return side ofthe hydraulic modular unit. Pump output is deliveredto the module and passes through the pressure filter.A relief valve in the module guards the system againstexcessive pressure, relief valve is set to open at 1626TO 2140 psi. The system solenoid valve is normallyde-energized and open to the SYS PRESS outlet of themodular unit but can be electrically energized tobypass position by placing the HYD TEST switch toposition marked for opposite system. A pressureswitch will cause the caution panel to light if modularunit outlet pressure decreases (at 600 TO 400 psi).

(1) Beyond the modular un i t , f lu id underpressure is delivered through tubes and hoses tothree dual hydraulic servo cylinders in main rotorcyclic and collective control systems. Fluid flows intoand out of one functional half of each dual cylinderwhen its servo control valve is moved mechanically bylinkage from a control stick, causing the cylinderpiston rod to make corresponding movements oflinkages to the main rotor. The cylinder valves alsohave internal functions which tend to preventfeedback of motion from the rotor to the control stick.Either system alone can operate the cylinders, but thedual (or tandem) arrangement is used for added safetyof operation.

(2) Fluid is returned from power cylinders andother units through external lines to the SYS RET inletof the module, to pass through the return filter.Normal return flow from module to reservoir isthrough a hose connected on the quick-disconnectcoupling which is at other times used to connectground test equipment, However, if this hose has notbeen connected, a low pressure (45 psi) will open arelief valve and allow flow through another line fromthe module RES RET outlet to the reservoir BYPASSinlet.

(3) Both hydraulic modular units are equippedwith quick disconnect couplings to allow groundoperation with a portable hydraulic test stand (S2).System operation with such a unit is the same asdescribed for normal operation, except that thereservoir and transmission-driven pump are notbeing used. External dc power will also be required forelectrically operated valves, caution panels, andelectric driven hydraulic pump when engine is notoperating.

b. Special Functions of System No. 1.

In addition to typical operation described in precedingparagraphs for both systems, hydraulic System No. 1has the following special functions:

(1) Tail rotor controls hydraulic cylinder. This isa single hydraulic cylinder and servo valve assembly,mechanically connected into control linkage to thetail rotor.

(2) Yaw stabil i ty and control augmentationsystem (SCAS) servo actuator. This circuit includes apressure l ine f i l ter , a three-way, two-posi t ionsolenoid valve, and an electro-hydraulic servoactuator connected in the tail rotor control linkage.

c. Special Functions of System No. 2.

In addition to typical operation described for bothsystems in paragraph 7-2, hydraulic System No. 2 hasthe following special functions:

(1) A r m a m e n t s y s t e m h y d r a u l i c p o w e rprovisions (figures 7-1, 7-2, and FO1). This circuitprovides pressure and return hydraulic l ines tocouplings where the M28A1E2 armament turrethydraulic system is connected. The pressure lineincludes a two-way, two-position solenoid shutoffvalve, controlled by the armament panel MASTERARM switch, a directional flow check valve, and abypass with a check valve to relieve pressure whensolenoid is off. The return line has a directional flowcheck valve. A bypass line with a relief valve isinstalled around the flow check valve in the pressureline.

(2) P i t c h a n d ro l l s t ab i l i t y and con t ro laugmentation system (SCAS) actuators. Circuits areprovided for pitch and roll functions of stabil i tyaugmentation system. Each of the two circuitsincludes a pressure line filter, a three-way two-position solenoid valve, and an electro-hydraulic

7-2

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Figure 7-1. Hydraulic System (Sheet 1 of 5)

7-3

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Figure 7-1.

TM

5

5-1

52

0-2

36

-23

7-4

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Figure 7-1. Hydraulic System (Sheet 3 of 5)

7-5