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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
ARMY MODELAH-1P (PROD)AH-1E (ECAS)
AH-1F (MODERNIZED COBRA)HELICOPTERS
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.
Remove pages Insert pages
i and ii i and ii
v and vi v and vi
xix and xx xix and xx
FO-98 FO-98
FO-109 FO-109
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
01546
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
HEADQUARTERSDEPARTMENT OF THE ARMY
WASHINGTON, D.C., 31 October 1995
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
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.
Remove pages
i through vi
vi.1/(vi.2 blank)vii and viiiviii.1/(viii.2 blank)ix and xx.1/(x.2 blank)xi and xii- - - - - -
xvii and xviiixviii.1/(xviii.2 blank)xix through xxi/(xxii blank)
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i through vi
vi.1 and vi.2vii and viiiviii.1/(viii.2 blank)ix and xx.1/(x.2 blank)
xi and xiixii.1/(xii.2 blank)xvii and xviiixviii.1 and xviii.2xix through xxii
2. Retain this sheet in front of manual for reference purposes
URGENT
TM 55-1520-236-23-4C 13
DISTRIBUTION:To be distributed in accordance with DA Form 12-31-E, block no. 1149, requirements for
TM 55-1520-236-23-4.
TM 55-1520-236-23-4C12
CHANGE
NO. 12
HEADQUARTERSDEPARTMENT OF THE ARMY
WASHINGTON, D. C., 31 August 1994
Aviation Unit and Intermediate Maintenance Manual
ARMY MODELAH-1P (PROD)AH-1E (ECAS)
AH-1F (MODERNIZED COBRA)H E L I C O P T E R S
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited
TM 55-1520-236-23-4, 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.
Remove pages
vi.1/(vi.2 blank)
ix and x
x.1 /(x.2 blank)
xi and xii
xv and xvi
xvii and xviii
xviii.1/(xviii. 2 blank)
xix and xx
FO-42
FO-53
-------------------------
FO-63
FO-82
FO-83
FO-85
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vi.1/(vi.2 blank)
ix and x
x.1/(x.2 blank)
xi and xii
xv and xvi
xvii and xviii
xviii.1/(xviii.2 blank)
xix and xx
FO-42
FO-53
FO-54.1 through FO-54.4
FO-63
FO-82
FO-83
FO-85
TM 55-1520-236-23-4
C 1 2
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FO-88
FO-98
FO-104
FO-112
FO-121
FO-130
FO-138
Insert pages
FO-88
FO-98
FO-104
FO-112
FO-121
FO-130
FO-138
2. Retain this sheet in front of manual for reference purposes.
By Order of the Secretary of the Army:
Official:
MILTON H. HAMILTONAdministrative Assistant to the
Secretary of the Army07293
GORDON R. SULLIVANGeneral, 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.
CHANGE
NO. 11
TM 55-1520-236-23-4C11
HEADQUARTERSDEPARTMENT OF THE ARMY
WASHINGTON, D.C., 30 SEPTEMBER 1992
AVIATION UNIT AND INTERMEDIATEMAINTENANCE MANUAL
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.
Remove pages Insert pages
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
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 .
By Order of the Secretary of the Army:
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
HEADQUARTERSDEPARTMENT OF THE ARMY
WASHINGTON, D.C. 21 February 1991
AVIATION UNIT AND INTERMEDIATEMAINTENANCE MANUAL
ARMY MODELAH-1P (PROD)AH-1E (ECAS)
AH-1F (MODERNIZED COBRA)HELICOPTERS
TM 55-1520-236-23-4, 8 May 1980, is changed as follows:
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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a and bI n t r o d u c t i o ni t h r o u g h v i- - - - -
v i i a n d v i i i- - - - -
ix and x- - - - -
x i t h rough xv i- - - - -- - - - -
x i x t h r o u g h x x i iFO-2FO-42FO-53FO-82FO-83FO-85FO-88FO-104FO-138Cover 1/2
a and bI n t r o d u c t i o ni t h r o u g h v iv i . 1 / v i . 2v i i a n d v i i iv i i i . 1 / v i i i . 2ix and xx . 1 / x . 2x i t h r o u g h x v ix v i . 1 / x v i . 2x v i i i . 1 / x v i i i . 2x i x t h r o u g h x x i / x x i iFO-2FO-42FO-53FO-82FO-83FO-85FO-88FO-104FO-138Cover 1/2
2. Reta in th i s shee t in f ron t o f manua l fo r re fe rence purposes .
TM 55-1520-236-23-4C 1 0
By Order of the Secretary of the Army:
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
NO. 9
TM 55–1520-236-23-4C 9
HEADQUARTERSDEPARTMENT OF THE ARMY
WASHINGTON, D.C., 24 May 1990
AVIATION UNIT AND INTERMEDIATEMAINTENANCE MANUAL
ARMY MODELAH-1P (PROD)AH-1E (ECAS)
AH-1F (MODERNIZED COBRA)HELICOPTERS
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 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 .
Remove pages Insert pages
FO-119 FO–119
2. Reta in th i s shee t in f ron t o f manua l fo r re fe rence purposes .
By Order of the Secretary of the Army:
official:
CARL E. VUONOGeneral, United States Army
Chief of Staff
WILLIAM J. MEEHAN IIBrigadier General, United States Army
The Adjutant General
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
No. 8
TM 55-1520-236-23-4C 8
HEADQUARTERSDEPARTMENT OF THE ARMY
WASHINGTON D.C., 29 December 1988
Av ia t ion Un i t and In te rmed ia teMaintenance Manual
ARMY MODELAH-1P (PROD)AH-1E (ECAS)
AH-1F (MODERNIZED COBRA)HELICOPTERS
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.
Remove pages Insert pages
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
2. Reta in th i s shee t in f ron t o f manua l fo r re fe rence purposes .
By Order of the Secretary of the Army:
Official:
WILLIAM J. MEEHAN IIBrigadier General, United States Army
The Adjutant General
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
No. 7
TM 55-1520-236-23-4C 7
HEADQUARTERSDEPARTMENT OF THE ARMY
WASHINGTON, D.C., 2 December 1988
Av ia t ion Un i t and In te rmed ia teMaintenance Manual
AH-1F
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 .
Remove pages Inser t pages
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
2. Reta in th i s shee t in f ron t o f manua l fo r re fe rence purposes .
By Order of the Secretary of the Army:
Official:
CARL E. VUONOGeneraI, United States Army
Chief of Staff
WILLIAM J. MEEHAN IIBrigadier General, United States Army
The Adjutant General
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
NO. 6
HEADQUARTERSDEPARTMENT OF THE ARMY
WASHINGTON, D.C., 18 July 1988
Av ia t ion Un i t and In te rmed ia teMaintenance Manual
ARMY MODELAH-1P (PROD)AH-1E (ECAS)
AH-1F (MODERNIZED COBRA)HELICOPTERS
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 mater ia li s ind 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.
Remove pages Insert pages
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
2. Reta in th i s shee t in f ron t o f manua l fo r re fe rence purposes .
By Order of the Secretary of the Army:
Official:
R. L. DILWORTHBrigadier GeneraI, United States Army
The Adjutant General
CARL E. VUONOGeneraI, United States Army
Chief of Staff
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, Attack.
TM 55-1520-236-23-4C 5
CHANGE
NO. 5
HEADQUARTERSDEPARTMENT OF THE ARMY
WASHINGTON, D.C., 31 August 1987
Av ia t ion Un i t and In te rmed ia teMaintenance Manual
ARMY MODELAH-1P(PROD)AH-1E(ECAS)
AH-1F(MODERNIZED COBRA)HELICOPTERS
TM 55-1520-236-23-4, 8 May 1980, is changed as follows:
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.
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FO-18FO-20- - - - -- - - - -
FO-28FO-30FO-33- - - - -- - - -
FO-52FO-60FO-68 and FO-69- - - - -
FO-87FO-90FO-93- - - - -- - - - -- - - - -
FO-103FO-109FO-115FO-122FO-124FO-130FO-138
FO-18FO-20FO-21.1FO-22.1FO-28FO-30FO-33FO-50.1FO-51.1FO-52FO-60FO-68 and FO-69FO-81.1FO-87FO-90FO-93FO-100.1FO-101.1FO-102.1FO-103FO-109FO-115FO-122FO-124FO-130FO-138
3 . Retain these sheets in f ront of manual for reference purposes.
TM 55-1520-236-23-4C 5
By Order of the Secretary of the Army:
Official:
CARL E. VUONOGeneral, United States Army
Chief of Staff
R. L. DILWORTHBrigadier General, United States Army
The Adjutant General
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.
TM 55-1520-236-23-4C 4
CHANGE
No. 4
HEADQUARTERSDEPARTMENT OF THE ARMY
WASHINGTON, D.C., 22 April 1985
Av ia t ion Un i t and In te rmed ia teMaintenance Manual
ARMY MODELAH-1S(PROD)AH-1S(ECAS)
AH-1S(MODERNIZED COBRA)HELICOPTERS
TM 55-1520-236-23-4, 8 May 1980, is changed as follows:
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.
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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
2. Reta in th i s shee t in f ron t o f manua l fo r re fe rence purposes .
By Order of the Secretary of the Army:
Official:
JOHN A. WICKHAM, JR.GeneraI, United States Army
Chief of Staff
DONALD J. DELANDROBrigadier General, United States Army
The Adjutant General
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
NO. 3
TM 55-1520-236-23-4C3
HEADQUARTERSDEPARTMENT OF THE ARMY
WASHINGTON, D.C., 2 November 1984
Aviat ion Unit and IntermediateMaintenance Manual
ARMY MODELAH-1S(PROD)AH-1S(ECAS)
AH-1S(MODERNIZED COBRA)HELICOPTERS
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 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.
Remove pages Insert pages
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
The Adjutant General
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
NO. 2
HEADQUARTERSDEPARTMENT OF THE ARMY
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 .
Remove pages I n s e r t p a g e s
F o l d O u t s F O - 8 7 F O - 8 7
2 . N e w o r c h a n g e d t e x t m a t e r i a l i s i n d i c a t e d b y a v e r t i c a l b a ri n t h e m a r g i n . 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 d b y a m i n i a t u r ep o i n t i n g h a n d .
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 .
By Order of the Secretary of the Army:
Official:
ROBERT M. JOYCEMajor GeneraI, United States Army
The Adjutant General
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
No. 1
TM 55-1520-236-23-4C 1
HEADQUARTERSDEPARTMENT OF THE ARMY
WASHINGTON, D.C., 10 September 1982
Av ia t ion Un i t and In te rmed ia teMaintenance Manual
ARMY MODELAH-1S(PROD)AH-1S(ECAS)
AH-1S(MODERNIZED COBRA)HELICOPTERS
TM 55-1520-236-23-4, 8 May 1980, is changed as follows:
1. Remove and insert pages as indicated below.
Remove pages Insert pages
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
2. New or changed tex t mate r ia l i 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 d b y a m i n i a t u r e p o i n t i n g h a n d .
3. Re ta in th i s shee t in f ron t o f manua l fo r re fe rence purposes .
By Order of the Secretary of the Army:
Official:
ROBERT M. JOYCEBrigadier General, United States Army
The Adjutant General
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.
NOTE
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.
a
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.
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 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
HEADQUARTERSDEPARTMENT OF THE ARMY
WASHINGTON, D.C., 8 May 1980
Aviation Unit and IntermediateMaintenance Manual
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, 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)
AH-1F (MODERNIZED COBRA)HELICOPTERS
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.
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited
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
3-1
4-1
1-11-411-451-581-871-89
2-12-1132-2292-2452-258
3-1
3-29
3-29
3-293-29
4-1
4-17
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
4-24
4-394-59
4-984-114
5-3
5-85-475-725-79
5-895-1075-114
6-16-56-206-75
6-96
6-113
6-129
8-18-10
8-1148-185
8-198
8-285
9-19-37
9-119
9-238
9-246
9-2549-340
9-412
PAGE
4-18
4-364-50.2
4-694-694-79
5-1
5-2.25-103
5-1385-1415-1485-1705-181
6-1
6-76-246-75
6-86
6-103
6-120.1
7-1
8-18 -78-25
8-368-38
8-52
9-19-27
9-56
9-739-75
9-769-102
9-122
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9-442
9-496
10-1
10-73
11-1
11-145
12-1
12-9
12-10
12-11
13-1
13-125
14-1
15-1
16-1
17-1
E-1
E-6
E-10E-14
9-154
9-185
10-1
10-17
11-1
11-81
12-1
12-4
12-4
12-5
13-1
13-37
14-1
15-1
16-1
17-1
A-1
B-1
C-1
D-1
E-1
E-2
E-4E-11
F-1
G-1
Index-1
FO-1
FO-143
Change 13 iii
TM 55-1520-236-23
LIST OF ILLUSTRATIONS
PAGE
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
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
Change 13 v
TM 55-1520-236-23
2-782-79
2-79.12-79.22-79.32-79.42-79.52-80
2-81
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
2-105
3-13-1.13-23 -3
3-4.13-53 -6
vi
LIST OF ILLUSTRATIONS (CON'T)
TITLE PAGE2-2092-210
2.212.22-212.32-212.32-212.42-212.42-214
2-215
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
2-256
3-23-4 .13-53-63-93-10.23-123-15
Change 13
NUMBER
3-4
TM 55-1520-236-23
LIST OF ILLUSTRATIONS (CON'T)
NUMBER3-73-83-93-103-114-14-24-34-3.14 -44 -54-64-7
4-7.1
4-8
4-8.1
4-9
4-104-10.1
4-114-12
4-13
4-144-15
4-15.14-15.24-164-17
4-17.1
4-184-18.14-194-19.14-19.24-19.34-20
PAGE3-173-193-213-233-254-24-2.24-4
4-74-134-16
4-19
4-22.2
4-23
4-24.1
4-264-30
4-30.14-34
4-37
4-384-40
4-414-44.104-44.114-45
4-47
4-504-50.14-50.34-54.34-54.4
4-54.64-57
Change 13 vi.1
TM 55-1520-236-23
NUMBER4-214-224-234-244-254-264-274-284-294-304-314-324-33
LIST OF ILLUSTRATIONS (CON'T)
PAGE4-604-614-644-664-704-734-754-794-814-834-844-85
4-86
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
5-18
5-195-19.15-205-20.15-21
5-225-235-245-24.15-24.25-255-265-27
PAGE4-874-894-914-924-934-954-964-974-1005-25-45-65-75-85-8.15-8.25-95-115-135-145-165-175-185-235-255-275-30.15-31
5-32
5-335-36.25-375-385-38.1
5-395-405-435-525-52.15-52.35-545-565-60
Change 13 vii
TM 55-1520-236-23
PAGE5-28
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
5-89
5-525-52.1
5-108
viii Change 13
TM 5-1520-236-23
LIST OF ILLUSTRATIONS (CON'T)
5-53PAGE5-108.15-108.45-108.5
5-53.15-53.25-54
5-109
5-54.1
5-55
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
LIST OF ILLUSTRATIONS (CON'T)
5 -865-875-885-895-905-915-925-935-945-955-965-975-985-99
PAGE5-1695-1715-1725-1735-1745-1765-1785-1825-1835-1855-1875-1885-1895-1915-1945-1955-1965-1985-2005-2015-2025-2035-204
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
5-205
5-2085-2095-2105-2125-2145-2155-2176-46-56-6.3
6-86-106-116-136-14.16-176-186-206-20.16-20.26-20.26-20.36-256-276-29
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
LIST OF ILLUSTRATIONS (CON'T)
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
PAGE6-826-856-876-886-90.26-916-996-1036-1056-1066-1086-1156-116
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
LIST OF ILLUSTRATIONS (CON'T)
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
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
PAGE6-1416-1426-1436-1446-1466-1476-1486-1496-1496-1506-1516-153
6-154.36-154.46-1556-1586-159
7-3
7-87-97-28
7-297-317-377-417-42
7-437-467-47
7-497-527-537-55
7-597-617-627-637-667-677-68.4
Change 13 xi
TM 55-1520-236-23
LIST OF ILLUSTRATIONS (CON'T)
NUMBER7-22.27-237-247-25
7-26
7-27
7-287-29
7-30
7-31
7-32
7-33
7-347-357-367-377-387-387-40
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
TITLE PAGE
7-68.67-737-75
7-80
7-81
7-817-84
7-92
7-95
7-987-98
7-997-1027-1047-1057-1077-1087-109
7-111
7-117
7-144
7-149
8-28-26.38-26.48-26.58-428-43
8-448-44.48-44.58-44.68-49
9-2
9-3
9-4
9-6
xii Change 13
TM 55-1520-236-23
LIST OF ILLUSTRATIONS (CON'T)
NUMBER TITLE PAGE
9 - 5
9 - 6
9 - 7
9 - 8
9 - 9
9-10
9-119-12
9-139-14
9-14.1
9-15
9-8
9-10
9-13
9-13
9-18
9-209-23
9-66
9-80.1
9-80.1
9-81
9-82.1
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
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
LIST OF ILLUSTRATIONS (CON’T)
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
LIST OF ILLUSTRATIONS (CON’T)
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
TITLE
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE
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
LIST OF ILLUSTRATIONS (CON’T)
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
TITLE
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE
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
LIST OF ILLUSTRATIONS (CON’T)
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE
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
FO-22.1
FO-23
FO-24
FO-25t
FO-26
FO-27
FO-28
FO-29
FO-30
FO-31
FO-32
FO-33
FO-34
FO-35
FO-36
FO-37
FO-38
FO-39
FO-40
FO-41
FO-42
FO-43
FO-44
FO-45
LIST OF ILLUSTRATIONS (CON'T)
TITLE PAGE
FO-18
FO-19
FO-20
FO-21
FO-21.1
FO-22
FO-22.1
FO-23
FO-24
FO-25
FO-26
FO-27
FO-28
FO-29
FO-30
FO-31
FO-32
FO-33
FO-34
FO-35
FO-36
FO-37
FO-38
FO-39
FO-40
FO-41
FO-42
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
FO-46
FO-47
FO-48
FO-49
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
FO-53
FO-54
FO-54.1FO-54.1FO-54.2FO-54.3FO-54.4
FO-54.2
FO-54.3
FO-54.4
FO-55
FO-56
FO-57
FO-58
FO-59
FO-60
FO-61
FO-62
FO-63
FO-64
FO-65
FO-66
FO-67
FO-68
FO-69
FO-70
FO-71
FO-72
FO-73
FO-55
FO-56
FO-57FO-58
FO-59
FO-60
FO-61
FO-62
FO-63
FO-64
FO-65
FO-66
FO-67
FO-68
FO-69
FO-70
FO-71
FO-72
FO-73
FO-74FO-74
FO-75
FO-76
FO-77
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
FO-92FO-93FO-94FO-95FO-96FO-97FO-98FO-99
LIST OF ILLUSTRATIONS (CON'T)PAGE
FO-78
FO-79
FO-80
FO-81FO-81.1
FO-82
FO-83
FO-84
FO-85
FO-86
FO-87
FO-88
FO-89
FO-90
FO-91
FO-92
FO-93
FO-94
FO-95
FO-96
FO-97
FO-98
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
FO-103FO-104FO-105FO-106FO-107FO-108FO-109FO-110
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
PAGE1-31-41-10.11-191-24.11-24.1
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 - 3
7 - 4
7-15
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
7 - 7
7 - 8
7 - 9
7-10
7-11
7-12
7-13
7-14
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
9 - 5
9 - 6
9 - 7
9 - 8
9 - 9
9-10
xx
7-76
7-77
7-79
7-84
7-957-97
7-122
7-125
7-1428-8
8-148-208-228-268-26.18-26.18-298-308-328-348-388-398-438-48
8-519-299-34
9-37
9-419-44.2
9-46
9-48
9-50
9-58
9-629-74
U.S. GOVERNMENT PRINTING OFFICE : 1996 - 755-025/40064Change 13 PIN: 045514-014
TM 55-1520-236-23
LIST OF TABLES (CON'T)
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
PAGE
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
LIST OF TABLES (CON'T)
NUMBER TITLE PAGE
9-32.9
9-33
9-34
9-35
9-36
9-36.1
9-36.2
9-36.3
9-36.4
9-36.5
9-36.6
9-36.7
9-36.8
9-37
9-38
9-39
9-40
9-41
9-42
9-43
9-44
10-111-112-112-213-113-216-1
16-2
16-3
F-1
F-2
F-3
F-4
F-5
F-6
xxii
9-122.16
9-1439-1459-150
9-152
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
16-13
16-16
16-39
F-9
F-15F-19
F-26F-32F-39
Change 13
TM 55-1520-236-23-4
By Order of the Secretary of the Army:
Official:
E. C. MEYERGeneral, United States Army
Chief of Staff
J. C. PENNINGTONMajor General, United States Army
The Adjutant General
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-1
FO-2
FO-2.1
FO-3
FO-4
FO-5
FO-6
FO-7
FO-8
FO-9
FO-10
FO-11
FO-12
FO-14
FO-15
FO-16
FO-17
FO-18
FO-19
FO-20
FO-21
FO-21.1
FO-22
FO-22.1
FO-23
FO-23.1
FO-24
FO-25
FO-26
FO-27
FO-28
FO-29
FO-30
FO-31
FO-32
FO-33
FO-34
FO-35
FO-36
FO-37
FO-38
FO-11 F FO-39
FO-40
FO-41
FO-42
FO-43
FO-44
FO-45
FO-46
FO-47
FO-48
FO-49
FO-50
FO-50.1
FO-51
FO-51.1
FO-52
FO-53
FO-54
FO-54.1
FO-54.2
FO-
FO-FO-54.3
FO-
FO-FO-54.4
FO-55
FO-56
FO-57
FO-58
FO-59
FO-60
FO-61
FO-62
FO-62FO-63
FO-62FO-64
FO-65FO-64
FO-65FO-66
FO-67
FO-68
FO-69
FO-70
FO-71
FO-72
FO-73
FO-73FO-74
FO-73FO-75
FO-77
FO-78
FO-79
FO-80
FO-81
FO-81.1
FO-82
FO-83
FO-84
FO-85
FO-86
FO-87
FO-88
FO-89
FO-90
FO-91
FO-92
FO-93
FO-94
FO-95
FO-96
FO-97
FO-99
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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