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TM 55-1520-236-23-1
TECHNICAL MANUAL
AVIATION UNIT AND INTERMEDIATEMAINTENANCE MANUAL
ARMY MODELAH-1P (PROD)AH-1E (ECAS)
AH-1F (MODERNIZED COBRA)HELICOPTERS
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
This manual supersedes TM 55-1520-236-23-1, dated 8 May 1980, including all changes.
HEADQUARTERS, DEPARTMENT OF THE ARMY12 APRIL 1996
TM 55-1520-236-23-1
TECHNICAL MANUAL
NO. 55-1520-236-23-1
HEADQUARTERSDEPARTMENT OF THE ARMY
WASHINGTON, D.C., 12 April 1996
Aviation Unit and IntermediateMaintenance Manual
For
ARMY MODELAH-1P (PROD)AH-1E (ECAS)
AH-1F (MODERNIZED COBRA)HELICOPTERS
NOTE
This manual is printed in five volumes, as follows:
TM 55-1520-236-23-1, dated 12 April 1996, consisting of Table of Contents, Preface, Chapters 1through 6.
TM 55-1520-236-23-2, dated 8 May 1980, consisting of Table of Contents, Chapters 7 through 17,Appendix A through C.
TM 55-1520-236-23-3, dated 8 May 1980, consisting of Table of Contents, Appendix D through G,and Index.
TM 55-1520-236-23-4, dated 8 May 1980, consisting of Table of Contents, FO-1 thru FO-142.
TM 55-1520-236-23-5, dated 31 July 1990, consisting of Table of Contents. FO-143 thru FO-144.
The Preface, Appendices and Index are applicable to all volumes.
WARNING PAGE TM 55-1520-236-23
WARNING
Personnel performing operations, procedures, and practices which areincluded or implied in this technical manual shall observe the followingwarnings. Disregard of these warnings and precautionary information cancause serious injury, or death.
Warnings, cautions, and notes are used to emphasize important and criticalinstructions and shall be used for the following conditions:
STARTING ENGINE
Starting and Operationof the helicopter will be performed only by
authorized personnel in accordance with AR 95-11
HIGH VOLTAGE
The helicopter should be electrically grounded when parked.Turn off all power switches before making electrical connections or disconnections.
Serious bums and electrical shock can result from contactwith exposed electrical wires or connectors.
RADIATION HAZARD
Self-luminous dials contain radioactive materials.If such an instrument is broken or becomes unsealed, avoid personal contact.
Use forceps or gloves made of rubber or polyethylene to pick up contaminated material.Place material and gloves in a plastic bag.
Seal bag and dispose of it as radioactive wastein accordance with AR 385-11 and TM 3-261 (TB 43-0108).
Repair procedures shall conform to requirements in AR 700-52.
RADIATION HAZARD
Thorium Fluoride
Some of the FLIR optics inside the C-NITE telescopic sight unit (TSU)have a coating that is slightly radioactive.
Accidental inhaling or swallowing of this material is hazardous to health.If the C-NITE TSU has been ruptured (by crash damage, etc.), dispose of broken optics in
accordance with AR 385-11 and TB 750-237.
a
TM 55-1520-236-23 WARNING PAGE
DANGEROUS CHEMICALS
Exposure to high concentrations of fire extinguishing agentscan cause severe irritation of eyes and nose.
Corrosive Battery Electrolyte (Potassium Hydroxide). Wearrubber gloves, apron, and face shield when handling baking
batteries. If potassium hydroxide is spilled on clothing, orother material, wash immediately with clean water. If spilled
on personnel, immediately start flushing the affected area withdean water. Continue washing until medical assistance arrives.
Use advents or chemicals in a well ventilated area.Do not inhale vapors or allow to come in contact with skin or eyes.
Observe proper fire prevention rules.
LASER LIGHT
The laser beam is dangerous and can cause blindness if itenters the eye either directly or reflected from a shiny
surface. Crewmen shall wear approved laser protectivevisors whenever in controlled area when laser rangefinder
or laser target designators are being used. Laser shallbe used only in controlled areas by qualified personnel.
NOISE LEVEL
Sound pressure levels in the helicopter during someoperating conditions exceed the Surgeon Generals hearing
conservation criteria as defined in TB MED 251.Hearing, protection devices, such as the aviator helmet or
ear plugs, are required to be worm by all personnel inand around the helicopter during its operation.
ASBESTOS FIBERS
Avoid creating dust. Breathing asbestos dustmay cause serious bodily harm.
ARMAMENT
When working on, or near an armed helicopter, take all possibleprecautions to avoid accidental firing of armament.
Personnel shall not occupy possible firing pattern in front of or up to20 meters behind rocket pods.
Munitions shall be handled by authorized personnel only.All weapons shall be dry-fired. Only dummy ammunition with smooth
oases like Iive ammunition shall be used.
b
WARNING PAGE TM 55-1520-236-23
JETTISON
All ground safety pins must be removed before flight.Failure to do so will prevent emergency jettison of stores.
Jettison circuit may be activated with BAT switch OFFand pilot WING STORES JTSN circuit breaker OPEN. For
positive deactivation of jettison circuit, open boththe PLT JTSN circuit breaker and the GNR JTSN circuit
breaker located in the pilot’s side console.Serious injury can result from accidental ground jettison.
Sanding on reinforced laminated glass producesfine dust that may cause skin irritations.
Observed necessary protective measures.
TRANSMISSION LEVELING
Do not attempt to level transmission with "Jacks Only".Hoist must be used in conjunction with jacks while lifting transmission.
EXTERNAL STORES
Prior to any helicopter maintenance functions thatrequire external stores be removed, JETTISON cartridge
shall be removed.Remove jettison cartridges from pylon stores ejection
device prior to placing helicopter in a hangar, to preventinjury to personnel and damage to equipment.
Exception: Removal is not necessary when helicopter isto be placed in hangar for short-term, providing both
PLT JTSN and GNR JETSN circuit breakers in the pilot’s sideconsole ore OPEN, and warning signs indicate that helicopter
has an armed jettison system.
CANOPY REMOVAL SYSTEM
Ground safety pins must be installed inpilot and gunner arming firing handles
of canopy removal system whenever thehelicopter is on the ground. Pins should
be installed by crew.
CLEANING HYDRAULIC COMPONENTS
The use of any alcohol in cleaning components which contacthydraulic fluids is prohibited. Formation of a
polymeric residue can result, which could impair mechanicaloperation of the component.
c
TM 55-1520-236-23 WARNING PAGE
HANDLING HYDRAULIC FLUID (MIL-H-83282)
When handling hydraulic fluid (MIL-H-83282), Table 1-3,Item 61, observe the following:
– Prolonged contact with liquid or mist can irritate eyesand skin.
– After any prolonged contact with skin, immediately washcontacted area with soap and water. If liquid contacts eyes,flush them immediately with clear water.
– If liquid is swallowed, do not induce vomiting; get im-mediate medical attention.
– Wear rubber gloves when handling liquid. If prolongedcontact with mist is likely, wear an appropriate respirator.
– When fluid is decomposed by heating, toxic gases arereleased.
EPOXY BASED ADHESIVE
Epoxy based adhesive, P/N EA934, contains an asbestosfiller which could be inhaled or ingested during grinding,cutting, or sanding operations on cured epoxy material.
TOOLS
Use only chrome plated steel or unplated steel tools for dis-assembly or reassembly procedures described in this man-ual. Use of cadmium or zinc plated tools is not permitted.
GROUNDING
All aircraft parked outside will be grounded and bonded,in accordance with FM 1-500, to the aerospace groundequipment while servicing, i.e., fueling or defueling, arming(ammunition or explosives), oxygen, hydraulic fluids or anyflammable liquids. Grounding is not necessary for aircraftparked outside unless one of the above is beingaccomplished.
INSPECTION OF REMOVED COMPONENTS
When components are being removed from an aircraft, allinspections required by the next phase maintenance inspec-tion must be accomplished prior to either immediate re-useor storage. Upon installation, the component will be in-spected in accordance with the current phase either thatphase the receiving aircraft is in or if in between phase, thelast phase performed). This will ensure that a are-used com-ponent will not overfly any PM inspections, and that it willbe properly interfaced with the receiving aircraft phasesequence.
d
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-1F (MODERNIZED COBRA)HELICOPTERS
REPORTING OF ERRORS
You can help improve this manual, if you find any mistakes or if you know of a way to improve the procedures, please letus know. Mail your letter, DA Form 2028 (Recommended Changes to Publications and Blank Forms), or DA Form 2028-2located in the back of this manual directly to: Commander, U.S. Army Aviation and Troop Command, ATTN: AMSAT-I-MP4300 Goodfellow Blvd.. St Louis, MO 63120-1798. A reply will be furnished to you. You may also submit yourrecommended changes by E-mail directly to <mpmt%avma28@st-louis-emh7 army. mil>. A reply will be furnished to you
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
TABLE OF CONTENTS
VOLUME 1
CHAPTER 1
Section I
Section II
section IllSection IVsection V
section VI
CHAPTER 2
Section ISection II
section Illsection IVSection V
CHAPTER 3
Section lSection II
Section IllSection IVSection V
CHAPTER 4
Section I
Section II
AIRCRAFT GENERAL
Servicing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HandIing, jacking, mooring, hoisting, and sling Ioading . . . . . .Inspection requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overhaul and retirement schedule . . . . . . . . . . . . . . . . . . . . . . .Flight safety critical aircraft parts (FSCAP) . . . . . . . . . . . . . . . . .
AIRFRAME
Structural repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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) . . . . . . . . . . . . . . . . . . . . . . . . .
1-11-28
1-301-551-581-59
2-12-412-2812-3352-352
3-1
4-1
1-11-41
1-451-581-871-89
2-12-1132-2292-2452-258
3-13-293-293-293-29
4-1
4-17
i
TM 55-1520-236-23
Section Ill
Section IV
Section V
Section VI
Section Vll
Section Vlll
CHAPTER 5
Section I
Section II
Section Ill
Section IV
Section V
Section VI
Section VII
Section Vlll
CHAPTER 6
Section I
Section II
Section Ill
Section IV
Section V
Section VI
Section VII
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 Vlll
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
9-37
9-119
9-238
9-246
9-254
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
ii
TM 55-1520-236-23
Section IX
Section 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
INDEX . . . . . . . . . .
Armament systems circuitry . . . . . . . . . . . . . . . . . . . . . . . .
Armament and fire control systems circuitry . . . . . . . . . . .
FUEL SYSTEMS
Fuel systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FLIGHT CONTROLS
Flight contols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Flight controls components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UTILITY SYSTEMS
Fire detection system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rain removal system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defroster system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low G Warning System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ENVIRONMENTAL CONTROL SYSTEM
Heating systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Air cooling systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HOIST AND WINCHES (Not Applicable) . . . . . . . . . . . . . . . . . .
AUXILIARY POWER PLANT (Not Applicable) . . . . . . . . . . . . . .
MISSION Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EMERGENCY EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . .
REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MAINTENANCE ALLOCATION CHART . . . . . . . . . . . . . . . . . . .
AIRCRAFT lNVENTORY MASTER GUIDE . . . . . . . . . . . . . . . .
ILLUSTRATED FIELD MANUFACTURE LIST . . . . . . . . . . . . . .
STORAGE OF AIRCRAFT
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Flyable storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Short term storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .lntermediate storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WIRE LISTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VOLUME IV
FOLDOUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VOLUME V
FOLDOUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PARAGRAPH
9-442
9-496
10-1
10-73
11-111-145
12-1
12-9
12-10
12-11
13-1
13-125
14-1
15-1
16-1
17-1
E-1E-6
E-10
E-14
PAGE
9-154
9-185
10-1
10-17
11-111-81
12-1
1 2 4
12-4
12-5
13-113-37
14-1
15-1
16-1
17-1
A-1
B-1
C-1
D-1
E-1E-2
E-4E-11
F-1
G-1
Index-1
FO-1
FO-143
iii
TM 55-1520-236-23
LIST OF ILLUSTRATIONS
NUMBER
1-11-1.11-21-31-41-51-61-71-81-91-9.11-101-111-122-12-22-32-42-52-62-72-82-92-102-112-122-132-142-152-15.12-162-172-182-192-202-212-222-232-242-252-262-272-282-292-302-312-31.12-31.22-322-332-342-352-362-37
iv
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
TM 55-1520-236-23
LIST OF ILLUSTRATIONS (CONT)
NUMBER
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
PAGE
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
v
TM 55-1520-236-23
NUMBER
2-782-792-79.12-79.22-79.3
2-79.4
2-79.5
2-802-812-822-83
2-842-85
2-86
2-87
2-882-892-902-91
2-92
2-92.1
2-93
2-94
2-952-962-972-98
2-99
2-100
2-1012-102
2-1032-104
2-105
3-1
3-1.1
3-2
3-33-4
3-4.13-53-6
vi
PAGE
2-209
2-2102-212.22-212.32-212.3
2-212.4
2-212.4
2-2142-2152-2162-217
2-2182-2192-221
2-2232-2242-2262-2302-231
2-2322-232.1
2-234
2-237
2-2402-2422-2442-246
2-2502-251
2-2522-2532-2542-256
3-2
3-4.1
3-5
3-63-9
3-10.23-123-15
TM 55-1520-236-23
LIST OF ILLUSTRATIONS (CONT)
NUMBER3-73-83-93-103-114-14-24-34-3.14-44 -5
4-64-7
4-7.1
4 -8
4-8.1
4 -9
4-104-10.1
4-114-12
4-13
4-144-15 4 - 4 1
4-15.14-15.24-164-17
4-17.1
4-184-18.14-194-19.14-19.24-19.34-20
TITLE PAGE
Ground Handling Gear-Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17Ground Handling Gear Pump, P/N BU0953B-Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19Ground Handling Gear Pump, P/N HP9902-41-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21Work Aid - Packing Nut Tool Removal/Installation - Fabrication Instructions . . . . . . . . . . . . 3-23Ground Handling Wheels -Adjustment Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25Power Plant Installation - Right Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2Power Plant installation -Left Safe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2.2Engine VibrationTest Equipment Cabling Tiedown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4DeletedEngine lnstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7Engine Mount Fittings (Trunnions) lnstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Damage Limits Aft Engine Mount Fittings (Trunnions) and Bearings . . . . . . . . . . . . . . . . . . . 4-16Particle Separator and FOD Screen Installation (Prior to Incorporation of
MWO 55-1520-236-50-12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Centrisep Particle Separator Installation (After Incorporation ofMWO 55-1520-236-50-12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22.2
Particle Separator-Air Flow Diagram (Prior to Incorporation ofMWO 55-152-236-50-12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
Centrisep Particle Separator Air Flow Diagram (After Incorporation ofMMO 55-1520-236-50-12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-24.1
Particle Separator and FOD Screen Assemblies (Prior to Incorporation ofMWO 55-1520-236-50-12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26
Inlet Vane Reinforcement Doubler - Fabrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30
Centrisep Particle Separator Repair/Replacement (After Incorporation ofMWO 55-1520-236-50-12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-30.1
FOD (Foreign Object Damage) Screen lnstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34
Exhaust System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-37
Engine Tailpipe Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-38Engine Deck and Firewall Sealing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40
Exhaust System Components with IR Suppression Installation . . . . . . . . . . . . . .Hot Metal Plus Plume suppressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44.10Outer Body Half - Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44.11Repair Procedures - Infrared Suppression System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-45
Exhaust System Components with IR Suppression - Installation . . . . . . . . . . . . . . . . 4-47
Suppresor Major Structural Elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-50Engine Oil System lnstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-50.1ODDS Oil Separator and Oil Filter Installation (MWO 1-1520-236-50-30) . . . . . . . . . . . . 4-50.3Engine Oil System Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-54.3Oil Separator (Lubriclone) Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-54.4DeletedEngine External Oil Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-54.7Oil Tank lnstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-57
Vi.1
TM 55-1520-236-23
NUMBER4-214-224-234-244-254-264-274-284-294-304-314-324-33
LIST OF ILLUSTRATIONS (CONT)
TITLEEngine Oil Cooler lnstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Oil Cooler Cleaning Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Engine Oil Cooler Turbine Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Oil Cooler Turbine Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Power Lever Control System lnstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Engine idle Stop installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Droop Cpmpensator Controls lnstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rigging Procedures - Droop Compensator Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Engine Shipping Container . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ignition Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Aft Engine Trunnion installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Trunnion, Cambox, and Linear Actuator Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Power Turbine Tachometer Generator, Oil Pressure Transducer, Oil Pressure Switch,
and Fuel Pressure Switch lnstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE4-604-614-644-664-704-734-754-794-814-834-844-85
4-86
vi.2
TM 55-1520-236-23
LIST OF ILLUSTRATIONS (CONT)
NUMBER TITLE PAGE
4-344-35
4-364-374-384-394-404-414-425-15-25-35 -45-4.15-4.25-55-65-75 -85 -95-105-115-125-135-145-155-165-16.15-17
5-18
5-195-19.15-205-20.15-21
5-225-235-245-24.15-24.25-255-265-27
4-874-894-914-924-934-954-964-974-1005-25-45-65 -75 -85-8.15-8.25 -95-115-135-145-165-175-185-235-255-275-30.15-31
5-32
5-335-36.25-375-385-38.1
5-395-405-435-525-52.15-52.35-545-565-60
vii
TM 55-1520-236-23
NUMBER5-285-28.15-28.25-28.35-28.45-28.55-28.6
5-68
5-28.75-28.85-28.95-28.105-28.115-28.12
5-28.135-28.145-28.155-28.165-295-305-315-325-335-34
5-365-375-38
5-35 5-825-83
5-865-38.1
5-395 4 05-40.15-40.25-415-425-42.15-435-445-455-465-475-485-495-505-515-525-52.1
LIST OF ILLUSTRATIONS (CONT)
TITLETypical Double Plug Patch Repair (K747 Blade) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Application of Trailing Edge Doubler Patch (K747 Blade) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .wine Repair (K747 Blade) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Rebinding 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 Determing Cur
rent 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 747-206) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Vacuum Bagging for Installation of Erosion Guard Repair Kit, P/N K747-206 . . . . . . . . . . . . . . .lmprovised Mod for Casting Small Section of Leading Edge Filler . . . . . . . . . . . . . . . . . . . . .Repair Parts Orientation Use for Removal and Installation of Stainless Steel Erosion Guard -
K747-003-303/403 and -303/403 Field Modified Blades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Preparation of K747-003/-403 BIade for Application of Sealant . . . . . . . . . . . . . . . . . . . . . . . . . .Application of SeaIant 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 Assembly . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Main Rotor Hub Yoke and Trunnion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Main Rotor Bearing Wear Patters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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 HubTrunnion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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 Support Assembly - Installation (MWO 55-1520-244-50-3 Incorporated)
PAGE5-67
5-715-72.15-72.35-72.5
5-72.75-72.105-72.115-72.155-72.185-72.21
5-72.235-72.245-72.265-72.275-72.315-72.355-745-775-785-795-81
5-85
5-86.15-875-885-88.15-88.25-895-905-905-90.25-925-935-965-975-995-1015-1025-1045-107
5-108
viii
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
5-63.25-645-655-65.15-65.25-665-675-685-695-705-715-726-735-745-755-765-775-785-795-805-815-825-835-845-85
TITLE
Collective Lever Trust Washer Wear Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rod End Clevis Movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Rod End Bearing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits - Pitch Link Assembly (Prior to Accomplishment of
MWO 55-1520-244-50-9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits - Pitch Link Assembly 209-010-520-103 (After Accomplishment of
MWO 55-1520-244-50-9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Damage Limits- Spline Plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits - Collectivr Lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits - Collective Lever ldle Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Collective Lever Idle Link Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits - Swashplate Anti-Drive Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Swashplate Anti - Drive Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits - Swashplate Anti-Drive Assembly Bellcrank . . . . . . . . . . . . . . . . . . . . . . . .Damage Limits - Swashplate Anti - Drive Assembly Support . . . . . . . . . . . . . . . . . . . . . . . . .Swashplate Anti - Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE5-108.1
5-108.45-108.5
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
viii.1/(viii.2 blank)
TM 55-1520-236-23
LIST OF ILLUSTRATIONS (cont)
NUMBER5-865-875-885-895-905-915-925-935-945-955-965-975-985-995-1005-1015-1025-1035-1045-1055-1065-1075-108
PAGE5-1695-1715-1725-1735-1745-1765-1785-1825-1835-1855-1875-1885-1895-1915-1945-1955-1965-1985-2005-2015-2025-2035-204
ix
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
6-136-146-156-15.16-166-16.16-16.26-16.36-176-186-196-206-216-22
6-236-246-24.16-24.26-256-266-276-286-296-306-31
x
PAGE5-205
5-2085-2095-2105-2125-2145-2155-2176-46-56-6.3
6-86-106-116-136-14.16-176-186-206-20.16-20.26-20.26-20.36-256-276-28
6 - 3 26 - 3 46-41644.16 4 5646.1646.2646.36 4 76-506-536-566-566-59
6-626-646-656-666-66.16-696-696-736-766-776-81
TM 55-1520-236-23
NUMBER
6-326-336-346-356-35.16-366-376-386-39
6-416-42
6-44
6-40
6-43
6-45
6-45.16-45.26-466-476-486-496-506-50.16-516-526-536-546-55
PAGE
6-826-856-876-886-90.26-916-996-1036-1056-1066-1086-1156-116
6-119
6-1206-120.26-120.26-1266-1276-1296-1316-1326-132.26-1356-1376-1386-1396-140
x.1/(x.2 blank)
. .
TM 55-1520-236-23
LIST OF ILLUSTRATIONS (CONT)
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
PAGE6-1416-1426-1436-144
6-1466-147
6-1486-1496-1496-1506-1516-153
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
xi
TM 55-1520-236-23
LIST OF ILLUSTRATIONS (CONT)
NUMBER7-22.27-237-247-25
7-267-27
7-287-29
7-30
7-31
7-32
7-33
7-347-357-367-377-387-397-40
7-41
7-42
7-43
8-1
8-28-2.18-2.28-38 -48-5
8-5.18-5.28-5.38 -69-1
9-2
9-3
9-4
PAGE7-68.67-737-75
7-807-81
7-817-84
Solenoid Valve P/N 7U7464 lnstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-92
Solenoid Valve P/N 7U7464 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-95
Functional Test Setup for Solenoid Valve P/N 7U7464 . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-98
Flow Diagram for Solenoid Valve P/N 7U7464 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-98
7-987-1027-1047-1057-1077-1087-109
7-111
7-117
7-144
Solenoid Valves (SCAS System) - lnstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-149
lnstrument System Equipment Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2Pitot - Static System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-26.3Connection for Pitot Leak Check (Typical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-26.4Connection for Static Leak Check (Typical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-26.5Test Circuit Setup for Fuel Tank Unit Capacitance and Resistance Tests . . . . . . . . . . . . . . . 8-42Test Circuit Setup for Fuel Quantity indicator Bench Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-43Circuit Arrangement and Adapter Cable for Fuel Quantity Adjustment Procedures on . . .
Installed System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-44Fuel Quantity Test Set P/N PSD60 - 1AF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-44.4Fuel Quantity "T" Cable P/N PSDAF - 537 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-44.5Fuel Quantity Calibration Worksheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-44.6
Volt-Ammeter Test Set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-49
Simplified Electrical Wiring Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
Simplified Electrical Bus Wiring Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
Electrkal Equipment Location Forward Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4
Electrical Equipment Location Pilot Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-6
xii
TM 55-1520-236-23
NUMBER
8-5
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
9-179-17.19-17.29-17.39-17.49-17.59-17.69-17.78-17.89-17.9
LIST OF ILLUSTRATIONS (CON'T)
TITLE PAGE
Electrical Equipment Location Gunner Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-8
Electrical Equipment Location Aft Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10
Electrical Equipment Locaton Forward Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-13
Electrical Equipment Location Pilot Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-13
Electrical Equipment Location Gunner Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-18
Electrical Equipment Location Aft Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-20Environmental Connector Test Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-23
Stanby lnverter Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-66
Pilot Caution Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-80.1
Pilot Caution Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-80.1Deleted
Pilot Caution Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-81Deleted
Gunner Caution Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-82.1
Gunner Caution Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-82.1
DeletedPilots Caution Panel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-88.7Pilots Caution Panel Subassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-88.8Housing Subassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-88.11Cover Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-88.11lndicating Light Circuit Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-88.12Contact Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-88.16Polarizing Keys Lotion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-88.17Removal of Finish for Electrical Bonding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-88.19
xii.1/(xii.2 blank)
TM 55-1520-236-23
NUMBER
9-17.109-17.119-17.129-17.139-189-199-209-219-229-239-249-259-269-279-289-299-309-31
9-329-33
10-110-210-3
10-410-4.110-4.210-510-610-711-111-211-311-411-511-611-711-811-911-1011-1111-1211-1311-14
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-88.35Bench Test Set-Up for RPM Limits Warning Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-93
Amment Equipment Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-128TOWMissile Launcher Positions . . . . . . . . . . . . . . . . . . . . . . ..9-131Wing Stores Armament Test Panel . . . . . . . . . . . . . . . . . . . . . . . . . 9-139Wing Stores Armament Test Panel Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-140Armament Equipment Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-155TOW Missile Launcher Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-164DU Digital Display Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-173LRUFault Identification and Location Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-173XM18 Minigun Circuitry Test Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-175Wing Stores Circuitry Test Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-180TOWMissile Launcher Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-195DUDigital Display Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-204LRUFault Identification and Location Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-204
XM18 Minigun Circuitry Test Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-206Wing Stores Circuitry Test Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-211
Fuel Systems Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-3Fuel System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......
10-4
Fuel Shutoff Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .........10-9
Fuel Boost Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . ............10-12.2Fuel Boost Pump Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-12.3Work Aid for Fuel Pump Cartridge Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-22Collapsing Forward Fuel Cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24Installed Forward Fuel Cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-26Collapsing Aft Fuel Cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-26Collective Controls, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .........Pilot Collective Stick Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-8
Pilot Collective Stick Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-9
Bearing Installation- Pilot Throttle Grip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-14
Friction Lining Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16
Throttle Lever Bearing Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-17
Collective 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-32
Work Aid for Rigging Swashplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-34
10-12.1
11-4
Xiii
TM 55-1520-236-23
LIST OF ILLUSTRATIONS (CON’T)
NUMBER TITLE PAGE
11-1511-1611-1711-1811-1911-2011-2111-2211-2311-2411-2511-2611-2711-27.111-2811-2911-3011-3111-3211-3311-3411-3511-3611-3711-3811-3912-112-212-312-412-512-6
13-113-213-313-413-513-613-6.113-713-813-913-1013-1113-1213-1313-14 13-1513-1613-1713-1816-116-2
Swashplate Rigging Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-35Pilot Cyclic Stick Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-36Pilot Cyclic Stick Assembly.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-40Collar and Bushing Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-42Pilot Cyclic Stick Friction Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-44Gunner Cyclic Stick Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-46Gunner Cyclic Stick Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-48Fore-And-Aft Cyclic Jackshaft Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-51Force Gradient Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-56.1Tail Rotor Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-57Tail Rotor Pedal Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-62
Stability and Control Augmentation System (SCAB) . . . . . . . . . . . . . . . . . . . . . . . . . 11-70Stability and Control Augmentation System (SCAS) . . . . . . . . . . . . . . . . . . . . . . 11-71
SCAS Transducer Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-74.2Elevator Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-76Elevator Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-79Damage Limits - Fixed Length Flight Control Tubes and Links (Typical) . . . . . . . . . . . 11-82Control System Linkage Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-85Damage Limits - Anti-Torque System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-95Damage Limits - Elevator Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-102Damage Limits - Collective Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-104Damage Limits -Cyclic Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-110Flight Control System Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-118Lateral Cyclic and Collective Controls Power Cylinder Support Installation . . . . . . . 11-119Fore-And-Aft Cyclic Controls Power Cylinder Support Installation. . . . . . . . . . . . . . . 11-120Damage Limits- Power Cylinder Supports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-121
Engine Fire Detection System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-3Low G Warning System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-5Low G Warning Assemb1y 8A10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-9Accelcrometer 8A11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-10Low G Warning Light/Switch 8DS25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-12Converter 8M1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-13Environmental Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-3Environmental Control Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-5Environmental Control System Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-7Temperature Control Valve.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-8Temperature Control Valve Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-9ECU Cooling Turbine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-12
ECU Cooling Turbine Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-12.1Pressure Regulator and Shutoff Valve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-14
Pressure Regulator and Shutoff Valve Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-16Blower Impeller Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-18Vent Air Control Valve - Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-21Vent Air Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-22Vent Air Control Valve Test Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-24Rain Removal Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-28Rain Removal Thermal Switch-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-30Rain Removal Nozzle and Cleared Air Pattern . . . . . . . . . . . . . . . . . . . . . . . 13-31Rain Removal Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-34L i m i t s C h a r t - A i r D i s t r i b u t i o n V a l v e . . . . . . 13-36T o o l A p p l i c a t i o n - T e f l o n L i p S e a l I n s t a l l a t i o n . . . . . . 13-38
Turret Installation . . . . . . . . 16-4Special Tools for Ejector Racks. 16-12
xiv