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TM 55-1520-236-23-4

TECHNICAL MANUAL

AVIATION UNIT AND INTERMEDIATEMAINTENANCE MANUAL

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

AH-1F (MODERNIZED COBRA)HELICOPTERS

“Approved for public release; distribution is unlimited.”

HEADQUARTERS, DEPARTMENT OF THE ARMY8 MAY 1980

P I N : 0 4 5 5 1 4 - 0 1 0

TM 55-1520-236-23-4C 14

CHANGE

No. 14

HEADQUARTERSDEPARTMENT OF THE ARMY

WASHINGTON, D.C., 30 April 1996

Aviation Unit and IntermediateMaintenance Manual

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

TM 55-1520-236-23-4, 8 May 1980, is changed as follows

1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical barin the margin. An illustration change is indicated by a miniature pointing hand.

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i and ii i and ii

v and vi v and vi

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FO-98 FO-98

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2. Retain this sheet in front of manual for reference purposes.

By Order of the Secretary of the Army:

Acting Administrative Assistant to theSecretary of the Army

DENNIS J. REIMERGeneral, United States Army

Chief of Staff

DISTRIBUTION:To be distributed in accordance with DA Form 12-31-E, block no. 1149, requirements for

TM 55-1520-236-23-4.

URGENT

CHANGE

NO. 13

TM 55-1520-236-23-4C 13

WASHINGTON, D.C., 31 October 1995

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

TM 55-1520-236-23-4, 8 May 1980, is changed as follows:

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i through vi

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URGENT

TM 55-1520-236-23-4C 13

TM 55-1520-236-23-4.

TM 55-1520-236-23-4C12

CHANGE

NO. 12

WASHINGTON, D. C., 31 August 1994

Aviation Unit and Intermediate Maintenance Manual

AH-1F (MODERNIZED COBRA)H E L I C O P T E R S

TM 55-1520-236-23-4, May 1980, is changed as follows:

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Official:

MILTON H. HAMILTONAdministrative Assistant to the

Secretary of the Army07293

GORDON R. SULLIVANGeneral, United States Army

Chief of Staff

TM 55-1520-236-23-4.

CHANGE

NO. 11

TM 55-1520-236-23-4C11

WASHINGTON, D.C., 30 SEPTEMBER 1992

AH- 1 F

TM 55-1520-236-23-4,

ARMY MODELAH-1P (PROD)AH-1E (ECAS)(MODERNIZED COBRA)HELICOPTERS

8 May 1980, is changed as follows:

1. Remove and insert pages as indicated below. New or changed text mater ia li s i nd ica ted by a ve r t i ca l ba r in the marg in . A n i l l u s t r a t i o n c h a n g e i s i n d i c a t e dby a miniature point ing hand.

x v i i a n d x v i i ix v i i i . 1 / x v i i i . 2FO-2FO-20FO-29FO-104FO-116FO-129

2. Reta in th i s shee t in f ron t o f manua l fo r re fe rence purposes .

Official:

MILTON H. HAMILTONAdministrative Assistant to the

Secretary of the Army02611

GORDON R. SULLIVANGeneral, United States Army

Chief of Staff

DISTRIBUTION:To be distr ibuted in accordance with DA Form 12-31-E, block no 1149, requirements

for TM 55-1520-236-23-4.

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

TM 55-1520-236-23-4C 1 0

CHANGE

NO. 10

WASHINGTON, D.C. 21 February 1991

1. Remove and insert pages as indicated below. N e w o r c h a n g e d t e x t m a t e r i a li s i nd ica ted by a ve r t i ca l ba r in the marg in . A n i l l u s t r a t i o n c h a n g e i s i n d i c a t e dby a miniature point ing hand.

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TM 55-1520-236-23-4C 1 0

Official:

THOMAS F. SIKORABrigadier General, United States Army

The Adjutant General

CARL E. VUONOGeneral, United States Army

Chief of Staff

DISTRIBUTION :To be distributed in accordance with DA Form 12-31-E, block no 1149, AVUM and

AVIM maintenance requirements for TM 55-1520-236-23-4.

CHANGE

TM 55–1520-236-23-4C 9

WASHINGTON, D.C., 24 May 1990

1. Remove and insert pages as indicated below. New or changed text mater ia li s i nd ica ted by a ve r t i ca l ba r in the marg in . A n i l l u s t r a t i o n c h a n g e i s i n d i c a t e dby a m in ia tu re po in t ing hand .

FO-119 FO–119

official:

Chief of Staff

WILLIAM J. MEEHAN IIBrigadier General, United States Army

DISTRIBUTION:To be distributed in accordance with DA Form 12-31, AVUM and AVIM Maintenance

requirements for AH-1F and AH-1P/E Hel icopter, At tack.

*U.S. GOVERNMENT PRINTING OFFICE 1990–754030/25570

PIN: 045514–009

CHANGE

TM 55-1520-236-23-4C 8

WASHINGTON D.C., 29 December 1988

Av ia t ion Un i t and In te rmed ia teMaintenance Manual

TM 55-1520-236-23-4, 8 May 1980, is changed as fo l lows:

1. Remove and insert pages as indicated below. New or changed text mater ia li s i nd ica ted by a ve r t i ca l ba r in the marg in . A n i l l u s t r a t i o n c h a n g e i s i n d i c a t e dby a miniature point ing hand.

x i a n d x i i x i a n d x i i- - - x i i . 1 / x i i . 2

x i x t h r o u g h x x i / x x i i x i x t h r o u g h x x i / x x i i- - - FO-23.1

Official:

DISTRIBUTION:

CARL E. VUONOGeneraI, United States Army

Chief of Staff

To be distributed in accordance with DA Form 12-31, AVUM and AVIM Requirementsfor AH-1F and AH-1P/E Hel icopter, Attack.

CHANGE

TM 55-1520-236-23-4C 7

WASHINGTON, D.C., 2 December 1988

TM 55-1520-236-23-4,

1. Remove and insert pages as

ARMY MODELAH-1P (PROD)AH-1E (ECAS)(MODERNIZED COBRA)HELICOPTERS

6 May 1980, is changed as fo l lows:

ind ica ted be low. New or changed text mater ia li s i nd ica ted by a ve r t i ca l ba r in the marg in . A n i l l u s t r a t i o n c h a n g e i s i n d i c a t e dby a m in ia tu re po in t ing hand .

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c and d c and d- - - FO-2.1/FO-2.2

FO- 10 FO-10FO- 13 FO-13FO-16 FO-16FO-43 FO-43FO-44 FO-44

Official:

Chief of Staff

DISTRIBUTION:To be distributed in accordance with DA Form 12-31, AVUM and AVIM requirements for

AH-1F He l i cop te r , A t tack , and AH-1P/E He l i cop te r , A t tack .

TM 55-1520–236-23-4C 6

CHANGE

WASHINGTON, D.C., 18 July 1988

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i i i t h r o u g h x x i / x x i i i i i t h r o u g h x x i iFO-123 FO-123

Official:

R. L. DILWORTHBrigadier GeneraI, United States Army

Chief of Staff

requirements for AH-1F, and AH-1P/E Hel icopter, Attack.

TM 55-1520-236-23-4C 5

CHANGE

WASHINGTON, D.C., 31 August 1987

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

AH-1F(MODERNIZED COBRA)HELICOPTERS

1. Title has been changed as stated above.

2. Remove and insert pages as indicated below. New or changed text materiali s i nd ica ted by a ve r t i ca l ba r in the marg in . A n i l l u s t r a t i o n c h a n g e i s i n d i c a t e dby a miniature point ing hand.

FO-18FO-20- - - - -- - - - -

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3 . Retain these sheets in f ront of manual for reference purposes.

TM 55-1520-236-23-4C 5

Official:

Chief of Staff

R. L. DILWORTHBrigadier General, United States Army

requirements for AH-1F and AH-1P/E Hel icopter, At tack.

TM 55-1520-236-23-4C 4

CHANGE

WASHINGTON, D.C., 22 April 1985

ARMY MODELAH-1S(PROD)AH-1S(ECAS)

AH-1S(MODERNIZED COBRA)HELICOPTERS

10 Remove and insert pages as indicated below. New or changed text mater ia li s i nd ica ted by a ve r t i ca l ba r in the marg in . A n i l l u s t r a t i o n c h a n g e i s i n d i c a t e dby a miniature point ing hand.

FO-44 FO-44FO-46 thru FO-48 FO-46 thru FO-48FO-50 and FO-51 FO-50 and FO-51FO-53 thru FO-55 FO-53 thru FO-55FO-57 thru FO-64 FO-57 thru FO-64FO-67 and FO-68 FO-67 and FO-68FO-70 thru FO-72 FO-70 thru FO-72

Official:

JOHN A. WICKHAM, JR.GeneraI, United States Army

Chief of Staff

DONALD J. DELANDROBrigadier General, United States Army

DISTRIBUTION:To be distr ibuted in accordance with DA Form 12-31, Organizat ional , DS and GS

Maintenance requirements for AH-1S(MOD COBRA) and AH-1S(PROD)(ECAS) aircraft.

*U.S. GOVERNMENT PRINTING OFFICE: 1985-564-030/20045

U R G E N T

CHANGE

TM 55-1520-236-23-4C3

WASHINGTON, D.C., 2 November 1984

Aviat ion Unit and IntermediateMaintenance Manual

1. Remove and insert pages as indicated below. New or changed text materiali s i nd ica ted by a ve r t i ca l ba r in the marg in . An i l l us t ra t ion change i s ind ica tedby a miniature point ing hand.

c /d c and d

2. Retain th is sheet in f ront of manual for reference purposes.

By order of the Secretary of the Army:

Official:

JOHN A. WICKHAM, JR.General, United States Army

Chief of Staff

ROBERT M. JOYCEMajor General, United States Army

DISTRIBUTION:To be distr ibuted in accordance wi th DA Form 12-31, Organizat ional , Direct

Support, and General Support Maintenance requirements for AH-1S(MOD COBRA) andAH-1S(PROD)(ECAS) aircraft.

U R G E N T

T M 5 5 - 1 5 2 0 - 2 3 6 - 2 3 - 4C 2

CHANGE

WASHINGTON, D.C., 12 October 1983

A v i a t i o n U n i t a n d I n t e r m e d i a t eM a i n t e n a n c e M a n u a l

ARMY MODELA H - I S ( P R O D )A H - I S ( E C A S )

AH-1S (MODERNIZED COBRA)HELICOPTERS

T M 5 5 - 1 5 2 0 - 2 3 6 - 2 3 - 4 , 8 M a y 1 9 8 0 , i s c h a n g e d a s f o l l o w s :

NOTICE

W h e n t h e f o l l o w i n g l i s t o f c h a n g e s o n T M 5 5 - 1 5 2 0 - 2 3 6 - 2 3 -S e r i e s m a n u a l s a r e r e c e i v e d a n d i n c o r p o r a t e d i n t o m a n u a l st h e y w i l l s u p e r s e d e t h e T M 5 5 – 1 5 2 0 - 2 3 9 - 2 3 - S e r i e s m a n u a l s .

TM 55-1520–236–23–1, Changes 1 th rough 13T M 5 5 - 1 5 2 0 – 2 3 6 - 2 3 – 2 , C h a n g e s 1 t h r o u g h 3T M 5 5 - 1 5 2 0 - 2 3 6 - 2 3 - 3 , C h a n g e s 1 a n d 2T M 5 5 - 1 5 2 0 - 2 3 6 - 2 3 - 4 , C h a n g e s 1 a n d 2

1 . R e m o v e a n d i n s e r t p a g e s a s i n d i c a t e d b e l o w .

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3 . R e t a i n t h i s s h e e t i n f r o n t o f m a n u a l f o r r e f e r e n c e p u r p o s e s .

Official:

ROBERT M. JOYCEMajor GeneraI, United States Army

JOHN A. WICKHAM, JR.General, United States Army

Chief of Staff

D I S T R I B U T I O N :T o b e d i s t r i b u t e d i n a c c o r d a n c e w i t h D A F o r m 1 2 - 3 1 , O r g a n i z a t i o n a l

M a i n t e n a n c e r e q u i r e m e n t s f o r A H - I S ( P R O D ) a i r c r a f t .

CHANGE

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WASHINGTON, D.C., 10 September 1982

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Table of Contents i t h r u i i i / i v i t h r u x x i / x x i iFold Outs FO-48 FO-48

FO-66 FO-66FO-98 FO-98FO-130 FO-130FO-134 thru FO-136 FO-134 thru FO-136

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3. Re ta in th i s shee t in f ron t o f manua l fo r re fe rence purposes .

Official:

ROBERT M. JOYCEBrigadier General, United States Army

DISTRIBUTION:

E. C. MEYERGeneraI, United States Army

Chief of Staff

To be distr ibuted in accordance with DA Form 12-31, Organizat ional MaintenanceRequirements for AH-1S(PROD) aircraf t .

WARNING PAGE TM 55-1520-236-23

WARNING

Personnel performing operations, procedures, and practices whichare included or implied in this technical manual shall observe thefollowing warnings. Disregard of these warnings and precautionaryinformation can cause serious injury, or death.

Warnings, cautions, and notes are used to emphasize important andcritical instructions and shall be used for the following conditions:

WARNING

An operating procedure, practice, etc., which, ifnot correctly followed, could result in personalinjury or loss of life.

CAUTION

An operating procedure, practice, etc., which ifnot strictly observed, could result in damage toor destruction of equipment.

An operating procedure, condition, etc., which itis essential to highlight.

STARTING ENGINE

Starting and Operationof the helicopter will be performed only by

authorized personnel in accordance with AR 95-1.

HIGH VOLTAGE

The helicopter should be electrically grounded when parked.Turn off all power switches before making electrical connections or disconnections.

Serious burns 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 beg and dispose of it as radioactive wastein accordance with AR 755-15 and TM 3-261 (TB 43-0108).

Repair procedures shall conform to requirements in AR 700-52.

TM 55-1520-236-23

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 leaking

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 withclean water. Continue washing until medical assistance arrives.

Use solvents 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 shinysurface. Crewmen shall wear approved laser protective

visors whenever in controlled area when laser rangefinderor laser target designators are being used. Laser shall

be 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 worn by all personnel inand around the helicopter during its operation.

ASBESTOS FIBERS

Avoid creating dust, Breathing asbestos dustmay cause serious bodily harm.

WARNING PAGE

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 feet behind rocket pods.

Munitions shall be handled by authorized personnel only.All weapons shall be dry-fired. Only dummy ammunition with smooth

cases like live ammunition shall be used.

b Change 10

WARNING PAGE TM 55-1520-236-23

JETTISON

Al l g round sa fe ty p ins mus t be removed be fo re f l i gh t .Fa i lu re to do so w i l l p reven t emergency je t t i son o f s to res .

Jet t ison circui t may be act ivated with BAT” switch OFFand pilot WING STORES JTSN circuit breaker OPEN. Forp o s i t i v e d e a c t i v a t i o n o f j e t t i s o n c i r c u i t , o p e n b o t h

the PLT JTSN and GNR JTSN circuit breakersl o c a t e d i n t h e p i l o t ’ s s i d e c o n s o l e . S e r i o u s

i n j u r y c a n r e s u l t f r o m a c c i d e n t a l g r o u n d j e t t i s o n .

SANDING DUST

Sanding on reinforced laminated glass producesf i n e d u s t t h a t m a y c a u s e s k i n i r r i t a t i o n s .

Observe necessary protect ive measures.

TRANSMISSION LEVELING

Do no t a t tempt to leve l t ransmiss ion w i th “JacksO n l y . ” Hoist must be used in conjunct ion with

j a c k s w h i l e l i f t i n g t r a n s m i s s i o n .

EXTERNAL STORES

Pr io r to any he l i cop te r ma in tenance func t ions tha trequire external stores be removed JETTISON

car t r i dge sha l l be removed . Remove jett isoncar t r i dges f rom py lon s to res e jec t ion dev ice p r io r

to p lac ing he l i cop te r in a hangar , to p reven tin jury to personnel and damage to equipment.

Except ion: Removal is not necessary when hel icopter isto be p laced in hangar fo r shor t - te rm, p rov id ing bo th

PLT JTSN and GNR JTSN circuit breakers in thepi lot ’s s ide console are OPEN, and warning signs

ind ica te tha t he l i cop te r has an a rmed je t t i son sys tem.

CANOPY REMOVAL SYSTEM

Ground sa fe ty p ins mus t be ins ta l led in p i lo tand gunner arming/f i r ing handles of canopy

removal system whenever the hel icopter is on theground. P ins shou ld be ins ta l l ed by c rew.

CLEANING HYDRAULIC COMPONENTS

The use of any alcohol in c leaning componentsw h i c h c o n t a c t h y d r a u l i c f l u i d s i s p r o h i b i t e d .

Formation of a polymeric residue canresu l t , wh ich cou ld impa i r mechan ica l

operat ion of the component.

Change 7 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.

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 COMPONENT’S

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 re-used com-ponent will not overfly any PM inspections, and that it willbe properly interfaced with the receiving aircraft phasesequence.

d Change 7 *U.S. GOVERMENT PRINING OFFICE: 1989 654-030/00057

*TM 55-1520 -236-23-4

TECHNICAL MANUAL

No. 55-1520-236-23-4

WASHINGTON, D.C., 8 May 1980

AH-1F (MODERNIZED COBRA)

HELICOPTERS

This manual is printed in five volumes, as follows:

TM 55-1520-236-23-1, consisting of Table of Contents, Preface Chapters 1 through 6.

TM 55-1520-236-23-2, consisting of Table of Contents. Chapters 7 through 17. Appendix A through C.

TM 55-1520-236-23-3, consisting of Table of Contents, Appendix D through G, and Index.

TM 55-1520-236-23-4, consisting of Table of Contents, FO-1 through FO-142.

TM 55-1520-236-23-5, consisting of Table of Contents, FO-143 through FO-145.

The Preface, Appendices and Index are applicable to all volumes.

*This manual together with TM 55-1520 -236-23-1,8 May 1980, TM 55-1520 -236-23-2,8 May 1980, TM 55-1520-236-23-3,8 May 1980, and TM 55-1520-236-23-5,31 July 1990, supersedes TM 55-1520-236-23-1,30 June 1977 and TM55-1520-236-23-2,30 June 1977.

Change 10

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)

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS

You can help Improve this manual. If you find any mistakes or if you know of a way to improvethese procedures, please let us know. Mail your letter or DA Form 2028 (Recommended Changesto Publications and Blank Forms), or DA Form 2028-2 located in the back of this manual directlyto: Commander, US Army Aviation and Troop Command, ATTN: AMSAT-I-MP, 4300 GoodfellowBlvd., St. Louis, MO 63120-1798. A reply will be furnished directly to you.

TABLE OF CONTENTS

VOLUME 1

CHAPTER 1

Section ISection II

Section IllSection IVSalon VSection VI

CHAPTER 2

Section ISection II

Section IlISection IVSection V

CHAPTER 3

Section ISection II

Section IIISection IVSection V

CHAPTER 4

Section I

Section II

1-11-281-301-551-581-59

2-12-412-2812-3352-352

1-11-411-451-581-871-89

2-12-1132-2292-2452-258

3-293-29

Change 13 i

TM 55-1520-236-23

Section Ill

Section IV

Section VSection VI

Section VIISection Vlll

CHAPTER 5

Section I

Section II

Section III

Section IVSection VSection VI

Section VIISection Vlll

CHAPTER 6

Section I

Section IISection Ill

Section IV

Section V

Section VI

Section Vll

VOLUME II

CHAPTER 7

CHAPTER 8

Section ISection II

Section III

Section IV

Section VSection VI

CHAPTER 9

Section ISection II

Section Ill

Section IV

Section V

Section VISection Vll

Section Vlll

PARAGRAPH

4-394-59

4-984-114

5-85-475-725-79

5-895-1075-114

6-16-56-206-75

8-18-10

8-1148-185

9-19-37

9-2549-340

4-364-50.2

4-694-694-79

5-2.25-103

5-1385-1415-1485-1705-181

6-76-246-75

6-120.1

8-18 -78-25

8-368-38

9-19-27

9-739-75

9-769-102

ii Change 13

TM 55-1520-236-23

PARAGRAPH

Section IX

Section X

CHAPTER 10

Section I

Section II

CHAPTER 11

Section I

Section II

CHAPTER 12

Section ISection 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 IllSection IV

APPENDIX F

APPENDIX G

INDEX . . . . . . . . . .

VOLUME IV

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

VOLUME V

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

11-145

13-125

E-10E-14

E-4E-11

Index-1

FO-143

Change 13 iii

TM 55-1520-236-23

LIST OF ILLUSTRATIONS

1-11-1.11-21-31-41-51-61-71-81-9

1-9.11-101-111-122-12-22-32-42-52-62-72-82-92-102-112-122-132-142-152-15.12-162-172-182-192-202-212-222-232-242-252-262-272-282-292-302-312-31.12-31.22-322-332-342-352-362-37

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

iv Change 10

TM 55-1520-236-23

LIST OF ILLUSTRATIONS (CON'T)

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

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 13 v

TM 55-1520-236-23

2-782-79

2-79.12-79.22-79.32-79.42-79.52-80

2-822-832-842-852-862-872-882-89

2-902-912-922-92.12-932-942-952-962-972-982-992-1002-1012-102

2-1032-104

3-13-1.13-23 -3

3-4.13-53 -6

TITLE PAGE2-2092-210

2.212.22-212.32-212.32-212.42-212.42-214

2-2162-2172-2182-2192-2212-2232-2242-2262-2302-2312-2322-232.12-2342-2372-2402-242

2-2442-2462-2502-2512-2522-2532-254

3-23-4 .13-53-63-93-10.23-123-15

Change 13

NUMBER

TM 55-1520-236-23

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

4-104-10.1

4-114-12

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

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

4-74-134-16

4-22.2

4-24.1

4-264-30

4-30.14-34

4-384-40

4-414-44.104-44.114-45

4-504-50.14-50.34-54.34-54.4

4-54.64-57

Change 13 vi.1

TM 55-1520-236-23

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

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

vi.2 Change 13

TM 55-1520-236-23

NUMBER4-344-354-364-374-384-394-404-414-425-15-25-35-45-4.15-4.25-55-65-75-85-95-105-115-125-135-145-155-165-16.15-17

5-195-19.15-205-20.15-21

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

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

5-335-36.25-375-385-38.1

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

Change 13 vii

TM 55-1520-236-23

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

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

5-28.75-28.85-28.9

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

5-28.105-28.115-28.12

5-28.135-28.145-28.155-28.16

5-295-305-315-325-33

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

5-345-355-365-375-38

5-865-38.1

5-395-40

5-40.15-40.2

5-415-42

5-42.1

5-435-445-455-465-475-485-495-505-51

5-86.15-875-885-88.15-88.2

5-905-905-90.25-925-935-965-975-995-1015-1025-1045-107

5-525-52.1

viii Change 13

TM 5-1520-236-23

5-53PAGE5-108.15-108.45-108.5

5-53.15-53.25-54

5-54.1

5-565-575-585-595-605-61

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

5-625-63

5-63.1

5-63.25-64

5-655-65.15-65.25-665-675-685-695-705-715-725-735-745-755-765-775-785-795-80

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

5-815-825-835-845-85

Change 13 viii.1/(viii.2 blank)

TM 55-1520-236-23

5 -865-875-885-895-905-915-925-935-945-955-965-975-985-99

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

5-1005-1015-1025-1035-1045-1055-1065-1075-108

Change 13 ix

TM 55-1520-236-23

5-1095-1105-1115-1125-1135-1145-1155-1165-1176-16-26-2.16-2.16-36-46-56-66-76-7.16 - 86 - 96-9.16-9.26-9.36-9.46-106-116-12

LIST OF ILLUSTRATIONS (CON'T)TITLE PAGE

5-2085-2095-2105-2125-2145-2155-2176-46-56-6.3

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

6 - 3 26-346-416-44.16 -456-46.16-46.26-46.36 - 4 76-506-536-566-586-596-62

6 - 6 56-666-66.16-686-696-736 - 7 66-776-81

6-136-146-156-15.16-166-16.16-16.26-16.3

6-176-186-196-206-216-22

6-236-24 6-646-24.16-24.26-256-266-276-286-296-306-31

x Change 13

TM 55-1520-236-23

6 -326-336-346-35

6-35.1

6 - 3 66 - 3 76 - 3 86 - 3 96 - 4 06 - 4 16 - 4 26 - 4 36 - 4 4

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

6-1196 - 4 5

6-45.16-45.2

6 -466-476-486-496-50

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

6-50.1

6-516-526-536-546-55

Change 4 x.1/(x.2 blank)

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

7-37-47-5

7-67-77-87-97-10

7-117-127-13

7-147-157-167-17

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

Non-Cleanable Filter Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Accumulator and Lockout Valve lnstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Work Aid for Dual Hydraulic Cylinder Removal and lnstallation . . . . . . . . . . . . . . . .Dual Hydraulic Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tool Application - Cylinder Assembly Torque Fixture, Part Numbers T41000310 - and

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

6-154.36-154.46-1556-1586-159

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 13 xi

TM 55-1520-236-23

NUMBER7-22.27-237-247-25

7-287-29

7-347-357-367-377-387-387-40

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

8-5.18-5.28-5.38-69-1

TITLE PAGE

7-68.67-737-75

7-817-84

7-987-98

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

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

8-448-44.48-44.58-44.68-49

xii Change 13

TM 55-1520-236-23

NUMBER TITLE PAGE

9-119-12

9-139-14

9-14.1

9-209-23

9-80.1

9-82.1

9-88.79-88.89-88.119-88.119-88.129-88.169-88.179-88.19

9-15.1

9 - 1 6

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

Change 13 xii.1/(xii.2 blank)

TM 55-1520-236-23

LIST OF ILLUSTRATIONS (CON’T)

NUMBER T I T L E PAGE

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

10-110-210-310-410-4.110-4.210-510-610-711-111-211-311-411-611-611-711-811-911-1011-1111-1211-1311-14

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

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-164DU Digital Display Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-173LRU Fault Identification and Location Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-173XM18 Minigun Circuitry Test Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-175Wing Stores Circuitry Test Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-180TOW Missile Launcher Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-195DU Digital Display Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-204LRU Fault Identification and Location Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-204XM18 Minigun Circuitry Test Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-206Wing Stores Circuitry Teat Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-211

Fuel Systems Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-3Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-4Fuel Shutoff Valve.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-9

Fuel 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-16Thrott le Lever Bearing Instal lat ion. . . . . . . . . . . . . . .. . . . . . . . . .. . . . . .. 1 1 - 1 7Collective 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 Swashplat8e. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-34

C h a n g e l O ‘“”

TM 55-1520-236-23

NUMBER

11-1511-1611-1711-1811-1911-2011-2111-2211-2311-2411-2511-2611-2711-27.111-2811-2911-3011-3111-3211-3311-3411-3511-3611-3711-3811-3912-112-212-312-412-512-6

13-113-213-313-413-513-613-6.113-713-813-913-1013-1113-1213-1313-1413-1513-1613-1713-1816-116-2

T I T L E PAGE

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 (SCAS) . . . . . . . . . . . . . . . . . . . . . . . . . . 11-70Stibility and Control Augmentation System (SCAS) . . . . . . . . . . . . . . . . . . . . . . 11-71

SCAS Transducer Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-74.2 Elevator 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-121Engine Fire Detection System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-3Low G Warning System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-5Low G Warning Assembly 8A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-9Accelerometer 8A11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-10Low G Warning Light/Switch 8DS25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-12Converter 8M1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-13

Environmental Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-3

Environmental Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-5

Environmental Control System Schematic... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-7Temperature Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-8

Temperature Control Valve Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-9

ECU Cooling Turbine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-12

ECU Cooling Turbine Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-12.1

Pressure Regulator and Shutoff Valve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-14Pressure Regulator and Shutoff Valve Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-16Blower Impeller Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-18

Vent Air Control Valve-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-21

Vent Air Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-22

Vent Air Control Valve Test Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-24

Rain Removal Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-28

Rain Removal Thermal Switch-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-30

Rain Removal Nozzle and Cleared Air Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-31

Rain Removal Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-34

Limits Chart- Air Distribution Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-36

Tool Application -Teflon Lip Seal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-38

Turret Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-4Special Tools for Ejector Racks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-12

xiv Change 10

TM 55-1520-236-23

NUMBER

16-316-416-516-616-6.116-6.216-716-817-117-2C-1F-1F-1.1F-1.2F-2F-3F-4F-5F-6F-7F-8F-9F-10F-11F-12F-13F-14F-15F-16F-17F-17.1F-18F-18.1F-19F-20F-21F-22F-23F-24F-25F-26F-27F-28F-29

F-30F-31F-32F-33F-34F-35F-36F-37

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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 lndicating System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .Turn and Slip lndicating System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Radio Blower Cooling System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Armament Relay Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TOW Blower Cooling System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Radio Blower Cooling System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Attitude Indicating System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Fuel Quantity indicating System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tachometer Indicating System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Turn and Slip Indicating System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

16-2116-2416-2716-3216-32.116-32.216-3416-3517-217-4C-3F-5F-6

F-45F-47F-49F-50F-51F-52F-53F-54F-55F-56F-57F-58F-59F-60F-61F-63F-64F-65F-65F-66F-67F-83F-85F-87F-89F-90F-91F-92F-93F-94F-95F-97F-98F-99F-100F-101F-102F-103F-105

Change 12 xv

TM 55-1520-236-23

NUMBER

F-38F-38.1F-39F-40F-41F-42F-43F-44F-45F-46F-47F-48F-49F-50F-5 1F-52F-53F-54F-55F-56F-57F-58F-59F-60F-61F-62F-63F-64F-65F-66F-67F-68F-69F-70F-71F-72F-73F-74F-75F-76F-77F-78F-79F-80FO-1FO-2FO-3FO-4FO-5FO-6

Electrical Equipment Component Replacement Wiring Diagram . . . . . . . . . . . . . . . . . .Armament Relay Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .AC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tachometer Indicating System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Pressure indicating Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Temperature Indicating Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Attitude Indicating System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Turn and Slip lndicating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Fuel Quantity Indicating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Altimeter Vibrator System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DC Generator Power System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . .Battery System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .External Power Provisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DC Power Distribution and Interconnect Logic (Equipment Location) . . . . . . . . . . . . . .AC Power System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Starter System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ignition System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Interior Lights System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Caution Lights System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RPM Limit Warning System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . .Position Lights System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Anticollision Light System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Searchlight System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Engine De-lce System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Fuel Valve and Engine Oil Bypass Valve Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Fuel Boost System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Governor Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Idle Stop System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Force Trim System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Hydraulic Control System (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Environmental Control System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Pitot HeaterSystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TOW Blower Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Radio Blower Cooling System.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal Turret Subsystem (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TOW Missile Armament Subsystem (Equipment Location) . . . . . . . . . . . . . . . . . . . . . .Fire Control System (Equipmcnt Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Wing Stores Armament Subsystem (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . .Electrical Equipment Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Equipment Component Replacement (After MWO 55-1520-236-50-4) . . . . .C-NITE Subsystem (Equipment Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-NITE Electrical Equipment Component Replacement . . . . . . . . . . . . . . . . . . . . . .FLIR Subsystem Jumper Cable Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Hydraulic System Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hydraulic System Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Balancer and Strobex Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .AC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .AC Electrical Load Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F-106F-106.1F-108F-109F-110F-121F-131F-141F-147F-151F-160F-167F-177F-184F-189F-197F-207F-213F-221F-235F-259F-269F-276F-279F-284F-292

F-300F-307F-316F-322F-331F-341F-350F-354F-361F-367F-383F-399F-413F-425F-466F-469F-471F-472FO-1FO-2FO-3FO-4FO-5FO-6

xvi Change 12

TM 55-1520-236-23

N U M B E R

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

T I T L E

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

FO-7FO-8FO-9

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

Change 10 xvi.1/(xvi.2 blank)

TM 55-1520-236-23

FO-18FO-19FO-19FO-21

FO-21.1

FO-22.1

FO-25t

TITLE PAGE

FO-21.1

FO-22.1

F O - 4 3

F O - 4 4

F O - 4 5

F O - 4 6

F O - 4 7

F O - 4 8

F O - 4 9

Change 13 xvii

TM 55-1520-236-23

LIST OF lLLUSTRATIONS (CON'T)

FO-50FO-50FO-50.1 FO-50.1

FO-51 FO-51

FO-51.1FO-51.1FO-52

FO-52FO-53

FO-54.1FO-54.1FO-54.2FO-54.3FO-54.4

FO-54.2

FO-54.3

FO-54.4

FO-57FO-58

FO-74FO-74

FO-75FO-76FO-77

xviii Change 13

TM 55-1520-236-23

FO-78FO-79FO-80FO-81

FO-81.1

FO-82FO-83FO-84FO-85FO-86FO-87FO-88FO-89FO-90FO-91

LIST OF ILLUSTRATIONS (CON'T)PAGE

FO-81FO-81.1

F O - 9 9

F O - 1 0 0

FO-100.1

FO-101

FO-101.1

F O - 1 0 2

FO-102.1

F O - 1 0 3

F O - 1 0 4

F O - 1 0 5

F O - 1 0 6

F O - 1 0 7

F O - 1 0 8

F O - 1 0 9

F O - 1 1 0

FO-100

FO-100.1

FO-101FO-101.1

FO-102FO-102.1

Change 13 xviii.1

TM 55-1520-236-23

FO-111

FO-112

FO-113

FO-114

FO-115

FO-116

FO-117

FO-118

FO-119

FO-120

FO-121

FO-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

xviii.2

LIST OF ILLUSTRATIONS (CON'T)PAGE

FO-111

FO-112

FO-113

FO-114

FO-115

FO-116

FO-117

FO-118

FO-119

FO-120

FO-121

FO-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-199

FO-211

FO-213

FO-215

Change 13

FO-138

FO-139

FO-140

FO-141

FO-142

FO-143

FO-144

FO-145

FO-146

FO-147

TM 55-1520-236-23

LIST OF TABLES

1 - 11 - 21 - 31 - 41 - 51 - 61 - 71 - 81 - 9

31-41-10.11-191-24.11-24.1

1-101-11

1-11.11-12

2 - 12 - 22 - 32 - 42 - 54 - 1

4-1.14-1.2

4 - 24-2 .1

1-24.21-54.11-892-132-172-262-692-2484-434-44.44-44.84-514-54.54-675-345-455-495-585-1405-2186-16-6.26-6.46-90.16-1227-11

4 - 35 - 1

5-1.15-1.2

5 - 25 - 35 - 46 - 1

6 - 1 . 16 - 1 . 2

6 - 26 - 37 - 17 - 2

7-207-347-68.37-68.67-68.7

7-4 .17-4 .27-4 .3

7 - 57-71

Change 14 xix

TM 55-1520-236-23

LIST OF TABLES (CON'T)

NUMBER TITLE P A G E7 - 6

8-18-2

8 - 38 - 4

8-4.18-4.28-4.3

8 - 58 - 68 - 78 - 88 - 9

8-108-118-128-13

9 - 19 - 29 - 39 - 4

9-4 .1

7-957-97

7-1428-8

8-148-208-228-268-26.18-26.18-298-308-328-348-388-398-438-48

8-519-299-34

9-419-44.2

9-629-74

U.S. GOVERNMENT PRINTING OFFICE : 1996 - 755-025/40064Change 13 PIN: 045514-014

TM 55-1520-236-23

NUMBER9-119-129-12.19-139-149-159-15.19-15.29-15.39-15.49-15.59-169-16.19-16.29-179-189-199-209-219-229-239-249-259-269-26.1

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

9-32.2

8-32.3

9-32.4

9-32.5

9-32.6

9-32.7

9-32.8

9-759-779-78.19-799-839-839-88.29-88.219-88.279-88.289-88.369-919-94.19-94.39-959-989-1009-1029-1039-1059-1069-1079-1089-110

9-110.1

9-1119-1139-1159-1179-1189-121

9-122.1

9-122.3

9-122.5

9-122-7

9-122.9

9-122.11

9-122.13

9-122.15

Change 13 xxi

TM 55-1520-236-23

NUMBER TITLE PAGE

9-32.9

9-36.1

9-36.2

9-36.3

9-36.4

9-36.5

9-36.6

9-36.7

9-36.8

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

9-122.16

9-1439-1459-150

9-156.19-156.3

9-156.59-156.79-156.9

9-156.119-156.139-156.14

9-1769-1779-1819-183

9-2079-2089-2129-214

10-111-112-112-6

13-113-32

F-15F-19

F-26F-32F-39

Change 13

TM 55-1520-236-23-4

Official:

E. C. MEYERGeneral, United States Army

Chief of Staff

J. C. PENNINGTONMajor General, United States Army

DISTRIBUTION:To be distr ibuted in accordance with DA Form 12-31, Organizat ional Maintenance

requirements for AH-1S (PROD) aircraf t .

*US. GOVERNMENT PRINTING OFFICE 1980-665-134/2115

FO-2.1

FO-21.1

FO-22.1

FO-23.1

FO-11 F FO-39

FO-50.1

FO-51.1

FO-54.1

FO-54.2

FO-FO-54.3

FO-FO-54.4

FO-62FO-63

FO-62FO-64

FO-65FO-64

FO-65FO-66

FO-73FO-74

FO-73FO-75

FO-81.1

FO-100

FO-100.1

FO-101

FO-101.1

FO-102

FO-102.1

FO-104

FO-110

FO-111

FO-112

FO-113

FO-114

FO-115

FO-116

FO-117

FO-119

FO-120

FO-121

FO-122

FO-124

FO-125

FO-126

FO-127

FO-128

FO-130

FO-131

FO-132

FO-133‘

FO-134

FO-135

FO-136

FO-138

FO-139

FO-140

PIN: 045514-000

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