operator’smanual armymodeloh-58a/c helicopter · tm 55-1520-228-10, 17 january 1989, is changed...

* TM 55-1520-228-10TECHNICAL MANUAL

OPERATOR’S MANUALARMY MODEL OH-58 A/C

HELICOPTER

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

* THIS MANUAL SUPERSEDES TM 55-1520-228-10 AND TM 55-1520-235-10, 7 APRIL 1978, INCLUDING ALLCHANGES.

HEADQUARTERS, DEPARTMENT OF THE ARMY

17 JANUARY 1989

TM 55-1520-228-10

An operating procedure, practice, etc., which, if not correctly followed, could result in personnelinjury or loss of life.

An operating procedure, practice, etc., which, if not strictly observed, could result in damage to ordestruction of equipment.

NOTE

An operating procedure, condition, etc., which it is essential to highlight.

PRECAUTIONARY DATAPersonnel performing operations, procedures and practices which are included or implied in this technical manualshall observe the following warnings. Disregard of these warnings or precautionary information can cause seriousinjury or loss of life.

STARTING ENGINE

Coordinate all cockpit actions with ground observer. Ensure that rotors and blast areas are clear and re guard isposted, if available.

FIRE EXTINGUISHER

Exposure to high concentrations of monobromotribluoromethane (CF Br) extinguishing agent or toxic fumes pro-duced by the agent should be avoided. The liquid should not be allowed to come into contact with the skin, as it maycause frostbite or low temperature burns.

GROUND OPERATION

Engines will be started and operated only by authorized personnel. Reference AR 95-1.

ELECTROLYTE

Battery electrolyte is harmful to the skin and clothing. Neutralize any spilled electrolyte by ushing contacted areasthoroughly with water.

Change 12 a

TM 55-1520-228-10

CARBON MONOXIDE

When smoke, suspected carbon monoxide fumes, or symptoms of anoxia exist, the crew should immediately venti-late cabin and shut off heater.

HANDLING FUEL AND OILS

Turbine fuels and lubricating oil contain additives which are poisonous and readily absorbed through the skin. Donot allow them to remain on skin longer than necessary.

HANDLING HYDRAULIC FLUID (MIL-H-83282)

Prolonged contact with liquid or mist can irritate eyes and skin. After prolonged contact with skin, immediately washcontacted area with soap and water. If liquid contacts eyes, ush immediately with clean water. If liquid is swallowed,do not induce vomiting; get immediate medical attention. Wear rubber gloves when handling liquid. If prolongedcontact with mist is likely, wear an appropriate respirator. When uid is decomposed by heating, toxic gases arereleased.

HAZARDOUS CARGO

Items of cargo possessing dangerous physical properties, such as explosives, acids, ammable, etc., must be han-dled with extreme caution and in accordance with established regulations. Refer to TM 38-250.

NOISE

Sound pressure levels in this aircraft during some operating conditions exceed the Surgeon General’s hearing con-servation criteria as de ned in TB MED 501. Hearing protection devices, such as the aviator helmet or earplugs arerequired to be worn by all personnel in and around the aircraft during its operation.

b Change 14

TM 55-1520-228-10C17

CHANGE

NO. 17

HeadquartersDepartment of the Army

Washington, D.C.,19 FEBRUARY 2010

OPERATOR’S MANUALARMY MODEL OH-58A/C HELICOPTER

�� !

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� �-��.- 234� ��56 � �-��.- 234� ��56,#) �� ,#' ,#) �� ,#'

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By Order of the Secretary of the Army:

GEORGE W. CASEY, JR.

General, United States Army Chief of Staff

$&&3405

JOYCE E. MORROW Administrative Assistant to the

Secretary of the Army

Official:

Distribution: To be distributed in accordance with the initial distribution number (IDN) 310230 requirements for TM 55-1520-228-10.

TM 55-1520-228-10C16

CHANGE

NO. 16


Washington, D.C.,30 September 2009

OPERATOR’S MANUALARMY MODEL OH-58A/C HELICOPTER


TM 55-1520-228-10, 17 January 1989, 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

A through C/(D blank) A through C/(D blank)9-7 and 9-8 9-7 and 9-8

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


GEORGE W. CASEY, JR.

General, United States Army Chief of Staff

092


Secretary of the Army

Official:

Distribution: To be distributed in accordance with the initial distribution number (IDN) requirements for TM -1520-2 -10.

TM 55-1520-228-10C15

CHANGE

NO. 15


Washington, D.C.,24 December 2007

OPERATOR’S MANUAL ARMY MODEL OH-58A/C HELICOPTER





A through C/(D blank) A through C/(D blank)5-7 and 5-8 5-7 and 5-87-81 through 7-85/(7-86 blank) 7-81 through 7-83/(7-84 blank)8-7 and 8-8 8-7 and 8-89-5 and 9-6 9-5 and 9-69-13 through 9-15/(9-16 blank) 9-13/(9-14 blank)A-1 and A-2 A-1/(A-2 blank)Glossary-1 and Glossary-2 Glossary-1 and Glossary-2

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


GEORGE W. CASEY, JR. General, United States Army

Chief of StaffOfficial:


Secretary of the Army 0733129

DISTRIBUTION:

To be distributed in accordance with Initial Distribution Number (IDN) 310230, requirementsfor TM 55-1520-228-10.

TM 55-1520-228-10C14

CHANGE

NO. 14


Washington, D.C.,31 March 2006






a and b a and bA and B A and B2-1 through 2-4 2-1 through 2-42-7 through 2-10 2-7 through 2-102-13 and 2-14 2-13 and 2-142-23 and 2-24 2-23 and 2-242-29 and 2-30 2-29 and 2-302-35 through 2-38 2-35 through 2-382-46.1 and 2-46.2 2-46.1 and 2-46.22-49 through 2-52 2-49 through 2-522-57 and 2-58 2-57 and 2-583-3 and 3-4 3-3 and 3-45-1 and 5-2 5-1 and 5-2(5-3 blank)/5-4 through 5-12 (5-3 blank)/5-4 through 5-126-1 and 6-2 6-1 and 6-28-5 through 8-8 8-5 through 8-88-11 through 8-14 8-11 through 8-149-1 through 9-13/(9-14 blank) 9-1 through 9-13/(9-14 blank)

Retain this sheet in front of manual for reference purposes.


PETER J. SCHOOMAKER

General, United States Army

Chief of Staff

OFFICIAL:

JOYCE E. MORROW

Administrative Assistant to the

Secretary of the Army0528701

TM 55-1520-228-10C14

DISTRIBUTION: To be distributed in accordance with Initial Distribution Number (IDN) 310230, requirementsfor TM 55-1520-228-10.

TM 55-1520-228-10C13

CHANGE

NO. 13


Washington, D.C.,30 August 2005






A and B A and B2-11 and 2-12 2-11 and 2-12(5-3 blank) and 5-4 (5-3 blank) and 5-4



PETER J. SCHOOMAKER


Chief of Staff

OFFICIAL:

SANDRA R. RILEY




TM 55-1520-228-10C12

CHANGE

NO. 12


Washington, D.C.,10 June 2005






a and b a and bA and B A and B2-1 through 2-12 2-1 through 2-122-27 and 2-28 2-27 and 2-282-37 and 2-38 2-37 and 2-382-43 and 2-44 2-43 and 2-442-49 through 2-52 2-49 through 2-522-55 through 2-60 2-55 through 2-602-63 and 2-64 2-63 and 2-64(5-3 blank)/ 5-4 (5-3 blank)/ 5-47-79 and 7-80 7-79 and 7-808-7 and 8-8 8-7 and 8-89-7 and 9-8 9-7 and 9-8



PETER J. SCHOOMAKER


Chief of Staff

OFFICIAL:

SANDRA R. RILEY




TM 55-1520-228-10C11

CHANGE

NO. 11


Washington, D.C.,1 April 2003






a and b a and bA and B A and Bi through iv i through iv1-1 and 1-2 1-1 and 1-22-1 through 2-4 2-1 through 2-42-11 through 2-14 2-11 through 2-142-17 through 2-20 2-17 through 2-202-23 through 2-26 2-23 through 2-262-27 through 2-30 2-27 through 2-302-33 and 2-34 2-33 and 2-342-43 and 2-44 2-43 and 2-442-46.1 and 2-46.2 2-46.1 and 2-46.22-47 through 2-54 2-47 through 2-542-57 and 2-58 2-57 and 2-582-61 through 2-67/(2-68 blank) 2-61 through 2-67/(2-68 blank)3-1 through 3-8 3-1 through 3-83-8.1/(3-8.2 blank) 3-8.1 and 3-8.2— 3-8.3 and 3-8.43-11 through 3-14 3-11 through 3-143-17 through 3-20 3-17 through 3-203-23 and 3-24 3-23 and 3-243-24.1/(3-24.2 blank) 3-24.1/(3-24.2 blank)3-27 and 3-28 3-27 and 3-283-31 and 3-32 3-31 and 3-323-32.1 and 3-32.2 3-32.1 and 3-32.2— (3-32.3 blank)/3-32.43-33 through 3-36 3-33 through 3-365-1 through 5-10 5-1 through 5-106-1 through 6-7/(6-8 blank) 6-1 through 6-7/(6-8 blank)7-1 through 7-6 7-1 through 7-67-59 through 7-62 7-59 through 7-627-79 and 7-80 7-79 and 7-807-83 and 7-84 (7-83 blank)/7-848-1 through 8-8 8-1 through 8-88-8.1/(8-8.2 blank) —8-9 through 8-12 8-9 through 8-128-15 through 8-17/(8-18 blank) 8-15 through 8-17/(8-18 blank)9-1 and 9-2 9-1 and 9-29-7 and 9-8 9-7 and 9-89-11 through 9-14 9-11 through 9-14A-1/(A-2 blank) A-1 and A-2

TM 55-1520-228-10C11


Index-1 through Index-9/(Index-10blank)

Index-1 through Index-9/(Index-10 blank)



ERIC K. SHINSEKI


Chief of Staff

OFFICIAL:

JOEL B. HUDSON




TM 55-1520-228-10C10

CHANGE

NO. 10


Washington, D.C.,28 July 2000






a and b a and bA/(B blank) A and Bi through iv i through iv1-1 and 1-2 1-1 and 1-22-3 through 2-12 2-3 through 2-122-17 and 2-18 2-17 and 2-182-21 and 2-22 2-21 and 2-22— 2-22.1/(2–22.2 blank)2-23 and 2-24 2-23 and 2-24— 2-26.1 and 2-26.22-27 through 2-36 2-27 through 2-362-39 through 2-44 2-39 through 2-442-49 and 2-50 2-49 and 2-502-55 and 2-56 2-55 and 2-562-63 and 2-64 2-63 and 2-642-65/(2-66 blank) 2-65 and 2-66— 2-67/(2-68 blank)3-1 through 3-4 3-1 through 3-43-7 and 3-8 3-7 and 3-8— 3-8.1/(3-8.2 bank)3-23 and 3-24 3-23 and 3-243-24.1/(3-24.2 blank) 3-24.1/(3-24.2 blank)3-25 through 3-30 3-25 through 3-303-33/(3-34 blank) 3-33 through 3-36— 3-37/(3-38 blank)4-1 through 4-20 4-1/(4-2 blank)5-1 and 5-2 5-1 and 5-25-3 and 5-4 (5-3 blank)/5-45-5 through 5-12 5-5 through 5-126-1 through 6-6 6-1 through 6-66-7 and 6-8 6-7/(6-8 blank)6-9/(6-10 blank) 6-9/(6-10 blank)7-1 through 7-4 7-1 through 7-47-7 through 7-14 7-7 and 7-87-15/(7-16 blank) —7-17 through 7-46 —7-55 and 7-56 7-55 and 7-567-59 through 7-62 7-59 through 7-627-77 and 7-78 7-77 and 7-788-3 through 8-8 8-3 through 8-8— 8-8.1/(8-8.2 blank)8-9 through 8-16 8-9 through 8-16

TM 55-1520-228-10C10


8-17/(8-18 blank) 8-17/(8-18 blank)9-1 and 9-2 9-1 and 9-29-7 through 9-10 9-7 through 9-109-13 and 9-14 9-13/(9-14 blank)9-15/(9-16 blank) 9-15/(9-16 blank)A-1/(A-2 blank) A-1/(A-2 blank)Index-1 through Index-8 Index-1 through Index-8Index-9/(Index-10 blank) Index-9/(Index-10 blank)



ERIC K. SHINSEKI


Chief of Staff

OFFICIAL:

JOEL B. HUDSON




TM 55-1520-228-10C9

URGENTCHANGE

NO. 9








2-33 and 2-34 2-33 and 2-343-23 and 3-24 3-23 and 3-24— 3-24.1/(3-24.2 blank)3-31 and 3-32 3-31 and 3-32— 3-32.1 and 3-32.28-5 and 8-6 8-5 and 8-6



ERIC K. SHINSEKI


Chief of Staff

OFFICIAL:

JOEL B. HUDSON




TM 55-1520-228-10C8

URGENTCHANGE

NO. 8








i and ii i and ii2-29 and 2-30 2-29 and 2-305-7 and 5-8 5-7 and 5-88-5 and 8-6 8-5 and 8-69-15/(9-16 blank) 9-15/(9-16 blank)



DENNIS J. REIMER


Chief of Staff

OFFICIAL:

JOEL B. HUDSON



DISTRIBUTION: To be distributed in accordance with DA Form 12-31-E, block no. 0230, requirements for TM55-1520-228-10.

URGENT

TM 55-1520-228-10C7

URGENTCHANGE

NO. 7








2-47 and 2-48 2-47 and 2-482-51 through 2-54 2-51 through 2-545-7 and 5-8 5-7 and 5-88-5 through 8-8 8-5 through 8-8



GORDON R. SULLIVAN


Chief of Staff

OFFICIAL:

MILTON H. HAMILTON



DISTRIBUTION: To be distributed in accordance with DA Form 12-31-E, block no. 0230, requirements for TM55-1520-228-10.

TM 55-1520-228-10C6

URGENTCHANGE

NO. 6


Washington, D.C.,15 April 1992






2-27 and 2-28 2-27 and 2-28



GORDON R. SULLIVAN


Chief of Staff

OFFICIAL:

MILTON H. HAMILTON



DISTRIBUTION: To be distributed in accordance with DA Form 12-31-E, block no. 0230, -10 and CL mainte-nance requirements for TM 55-1520-228-10.

URGENT

TM 55-1520-228-10C5

URGENTCHANGE

NO. 5








3-27 and 3-28 3-27 and 3-285-11 and 5-12 5-11 and 5-128-17/8-18 8-17/8-18



GORDON R. SULLIVAN


Chief of Staff

OFFICIAL:

PATRICIA P. HICKERSON

Colonel, United States Army

The Adjutant General

DISTRIBUTION: To be distributed in accordance with DA Form 12-31-E, block no. 0230, -10 and CL mainte-nance requirements for TM 55-1520-228-10.

URGENT

TM 55-1520-228-10C4

URGENTCHANGE

NO. 4








2-21 and 2-22 2-21 and 2-222-45 and 2-46 2-45 and 2-46— 2-46.1 and 2-46.23-23 and 3-24 3-23 and 3-243-25 and 3-26 3-25 and 3-26



CARL E. VUONO


Chief of Staff

OFFICIAL:

WILLIAM J. MEEHAN II

Brigadier General, United States Army


DISTRIBUTION: To be distributed in accordance with DA Form 12-31, block no. 0230, -10 and CL mainte-nance requirements for TM 55-1520-228-10.

URGENT

TM 55-1520-228-10C3

URGENTCHANGE

NO. 3


Washington, D.C.,6 March 1990






6-7 and 6-8 6-7 and 6-8



CARL E. VUONO


Chief of Staff

OFFICIAL:




DISTRIBUTION: To be distributed in accordance with DA Form 12-31, block no. 0230, -10 and CL mainte-nance requirements for OH-58A and OH-58C Helicopter, Observation.

URGENT

TM 55-1520-228-10C2

URGENTCHANGE

NO. 2


Washington, D.C.,11 October 1989






5-11 and 5-12 5-11 and 5-128-13 and 8-14 8-13 and 8-14



CARL E. VUONO


Chief of Staff

OFFICIAL:





URGENT

TM 55-1520-228-10C1

CHANGE

NO. 1


Washington, D.C.,1 February 1990






a through c/d a through c/di through iv i through iv1-1 and 1-2 1-1 and 1-22-1 through 2-4 2-1 through 2-42-7 through 2-14 2-7 through 2-142-21 and 2-22 2-21 and 2-222-25 and 2-26 2-25 and 2-262-29 and 2-30 2-29 and 2-302-41 and 2-42 2-41 and 2-422-51 and 2-52 2-51 and 2-522-57 and 2-58 2-57 and 2-583-3 through 3-8 3-3 through 3-84-1 and 4-2 4-1 and 4-24-5 through 4-20 4-5 through 4-205-7 and 5-8 5-7 and 5-86-1 and 6-2 6-1 and 6-26-7 and 6-8 6-7 and 6-8— 6-8.1/6-8.28-1 through 8-8 8-1 through 8-89-1 and 9-2 9-1 and 9-29-9 through 9-15/9-16 9-9 through 9-15/9-16A-1/A-2 A-1/A-2Index 1 through Index 9/10 Index 1 through Index 9/10



CARL E. VUONO


Chief of Staff

OFFICIAL:




TM 55-1520-228-10C1


TM 55-1520-228-10

LIST OF EFFECTIVE PAGES

Dates of issue for original and changed pages are:

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TOTAL NUMBER OF PAGES IN THIS PUBLICATION IS 266, CONSISTING OF THE FOLLOWING:

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*Zero in this column indicates an original page.B Change 17

TM 55-1520-228-10

LIST OF EFFECTIVE PAGES (Cont)Page No. *Change No. Page No. *Change No.

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* TM 55-1520-228-10

TECHNICAL MANUAL U.S. ARMY AVIATIONAND MISSILE COMMAND

No. 55-1520-228-10 17 JANUARY 1989

OPERATOR’S MANUALARMY MODEL OH-58 A/C

HELICOPTER

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTSREPORTING OF ERRORS AND RECOMMENDING IMPROVEMENTS You can improve thismanual. If you f nd any mistakes or if you know of a way to improve these procedures, please letus know. Mail your letter or DA Form 2028 (Recommended Changes to Publications and BlankForms), located in the back of this manual, directly to: Commander, U.S. Army Aviation andMissile Command, ATTN: AMSAM-MMC-MA-NP, Redstone Arsenal, AL 35898-5000. A reply willbe furnished to you. You may also send in your comments electronically to our E-mail address:[email protected] or by fax 256-842-6546/DSN 788-6546. For the World Wide Web use:https://amcom2028.redstone.army.mil. Instructions for sending an electronic 2028 may be foundat the back of this manual immediately preceding the hard copy 2028.

TABLE OF CONTENTSPage

CHAPTER 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1CHAPTER 2 HELICOPTER AND SYSTEMS DESCRIPTION

AND OPERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1Section I HELICOPTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1Section II EMERGENCY EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18Section III ENGINES AND RELATED SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18Section IV FUEL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28Section V FLIGHT CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30Section VI HYDRAULIC SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32Section VII POWER TRAIN SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33Section VIII MAIN AND TAIL ROTOR GROUPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34Section IX UTILITY SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35Section X HEATING AND VENTILATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35Section XI ELECTRICAL POWER SUPPLY AND DISTRIBUTION SYSTEM . . . . . . . . . . . . . . . . . . 2-40Section XII LIGHTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43Section XIII FLIGHT INSTRUMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45Section XIV SERVICING, PARKING, AND MOORING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48

CHAPTER 3 AVIONICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1Section I COMMUNICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5Section II NAVIGATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17Section III TRANSPONDER AND RADAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24.1Section IV AN/ARC-201 SINCGARS RADIO SET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-34

CHAPTER 4 MISSION EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1Section I MISSION AVIONICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1Section II ARMAMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

CHAPTER 5 OPERATING LIMITS AND RESTRICTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1Section I GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1Section II SYSTEMS LIMITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1Section III POWER LIMITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7Section IV LOAD LIMITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8Section V AIRSPEED LIMITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

* THIS MANUAL SUPERSEDES TM 55-152-228-10 AND TM 55-1520-235-10, 7 APRIL 1978, INCLUDING ALL CHANGES.i

TM 55-1520-228-10

TABLE OF CONTENTS (Cont)Page

Section VI MANEUVERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10Section VII ENVIRONMENTAL RESTRICTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12

CHAPTER 6 WEIGHT/BALANCE AND LOADING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1Section I GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1Section II DD FORM 365 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9

CHAPTER 7 PERFORMANCE DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1Section I INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1Section II TEMPERATURE CONVERSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6Section X TORQUE AVAILABLE C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-47Section XI HOVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-56Section XII TAKEOFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-60Section XIII CRUISE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-62Section XIV DRAG C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-76Section XV CLIMB — DESCENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-78Section XVI IDLE FUEL FLOW C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-82

CHAPTER 8 NORMAL PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1Section I MISSION PLANNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1Section II OPERATING PROCEDURES AND MANEUVERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2Section III INSTRUMENT FLIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11Section IV FLIGHT CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11Section V ADVERSE ENVIRONMENTAL CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-14

CHAPTER 9 EMERGENCY PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1Section I AIRCRAFT SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1Section II MISSION EQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12

GLOSSARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Glossary-1INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Index-1

LIST OF ILLUSTRATIONS

Figure Title Page

2-1 General Arrangement A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22-2 General Arrangement C. Typical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42-3 Compartment Diagram A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-62-4 Pilot and Copilot/Observer Station Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-82-5 Principal Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-112-6 Turning Radius and Ground Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-132-7 Float Gear Equipped Helicopter A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-142-8 Locking Devices for Doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-152-9 WSPS Conf guration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

2-11 Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-202-12 Overhead Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-222-12.1 Overhead Console with AN/ARC-201 (Typical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22.12-13 Instrument Panel and Console (Typical) A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-252-14 Instrument Panel and Console C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-262-14.1 Instrument Panel and Console with AN/ARC-201 A. (Typical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26.12-14.2 Instrument Panel and Console with AN/ARC-201 C. (Typical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26.22-15 Auxiliary Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-292-16 Heating and Ventilation A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-362-17 Heater Control and Vent Pull Knobs C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-382-18 Electrical System Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-412-18.1 AAU-32/A Altitude Encode/Pneumatic Altimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-462-19 Warning and Caution Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47

ii

TM 55-1520-228-10

LIST OF ILLUSTRATIONS (Cont)Figure Title Page

2-20 Servicing Diagram A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-492-21 Servicing Diagram C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-512-22 Gravity Refueling With Closed Circuit Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-592-23 Refueling Receptacle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-612-24 Ground Handling Equipment, Covers, Rotor Tiedowns, and Mooring Diagram . . . . . . . . . . . . . . . . . 2-662-25 Paved Surface Mooring Conf guration (OH-58A/C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-67

3-1 Antenna Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-43-2 Communication System Control Panel C-6533/ARC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-63-3 AN/ARC-114 and AN/ARC-114A Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-73-4 AN/ARC-115 Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-93-5 AN/ARC-116 Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-103-6 UHF/AM Radio Sets AN/ARC-164, RT-1167/ARC-1164(V), and RT-1167C/ARC-1164(V) . . . . . . 3-113-8 Voice Security Equipment T/SEC KY-58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-153-9 AN/ARN-89 (ADF) Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

3-10 Radio Bearing Heading Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-203-11 CONUS Navigation Receiver Control Panel C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-223-12 Course Deviation Indicator (CDI) C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-233-13 Transponder APX-72 Control Panel A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-263-14 Transponder Set Control Panel C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-293-16 Radar Altimeter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-313-17 Radar Signal Detecting Set AN/APR-39A(V)1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32.4

3-7 AN/ARC-201 Control Panel & Zeroize Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-375-1 Instrument Markings A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25-2 Instrument Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-45-3 Airspeed Operating Limits Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-95-4 Practice Autorotation Landing Limits Crosswind Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-116-1 Helicopter Station Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16-2 Center of Gravity Limit Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-36-3 Cargo Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-46-4 Fuel Loading Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-56-5 Personnel Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-66-8 Cargo Moment Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8.17-1 Temperature Conversion Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

7-11 Maximum Torque Available (30 Minute Operation) Chart C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-487-12 Torque Available (Continuous Operation) Chart C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-527-13 Hover Chart C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-577-15 Cruise Chart C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-637-16 Drag Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-777-17 Climb-Descent Chart C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-797-18 Climb Performance C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-817-19 Idle Fuel Flow Chart C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-83

8-1 Exterior Check Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-48-2 Effects of Wind Azimuth On Aircraft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-139-1 Emergency Exits and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-39-2 Autorotational Glide Characteristics Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-59-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-6

iii/(iv Blank)

TM 55-1520-228-10

CHAPTER 1INTRODUCTION

1-1. GENERAL.

These instructions are for use by the operator. Theyapply to Army OH58-A/C Helicopters.

1-2. WARNINGS, CAUTIONS, AND NOTESDEFINED.

Warnings, cautions, and notes are used to emphasizeimportant and critical instructions and are used for thefollowing conditions:

Highlights an essential operating or mainte-nance procedure, practice, condition, state-ment, etc. which if not strictly observed, couldresult in injury to, or death of, personnel or longterm health hazards.

Highlights an essential operating or mainte-nance procedure, practice, condition, state-ment, etc., which, if not strictly observed, couldresult in damage to or destruction of equipmentor loss of mission effectiveness.

NOTE

Highlights an essential operating or mainte-nance procedure, condition, or statement.

1-3. DESCRIPTION — MANUAL

This manual contains the complete operating instruc-tions and procedures for the Army OH-58A/C helicopter.The primary mission of this helicopter is that of obser-vation and is designed for landing and take off fromprepared and unprepared surfaces. The observanceof procedures is mandatory except when modif cation

is required because of multiple emergencies, adverseweather, terrain, etc. Your f ying experience is recog-nized, and therefore, basic f ight principles are not in-cluded. It is required that THIS MANUAL BE CARRIEDIN THE HELICOPTER AT ALL TIMES.

1-4. APPENDIX A, REFERENCES.

Appendix A is a listing of off cial publications cited withinthe manual applicable to and available for f ight crews.

1-5. INDEX.

The index lists, in alphabetical order, every titled para-graph, f gure (F), and table (T) contained in this man-ual, Chapter 7 performance data has an additional indexwithin the chapter.

1-6. ABBREVIATIONS.

Designator symbols and abbreviations shall be used inconjunction with text contents, headings, and titles toshow effectivity of the material. Chapter 7 contains alist of abbreviations used in this publication.

1-7. ARMY AVIATION SAFETY PROGRAM.

Reports necessary to comply with the safety programare prescribed in AR 385-40.

1-8. DESTRUCTION OF ARMY MATERIAL TOPREVENT ENEMY USE.

For information concerning destruction of Army materielto prevent enemy use, refer to TM 750-244-1-5.

1-9. FORMS AND RECORDS.

Army aviators f ight record and helicopter maintenancerecords which are to be used by crewmembers are pre-scribed in DA PAM 738-751 and TM 55-1500-342-23.

Change 11 1-1

TM 55-1520-228-10

1-10. HELICOPTER DESIGNATION SYSTEM.

The designation system prescribed by AR 70-50 is usedin helicopter designations as follows:

EXAMPLE OH-58A

The designation system prescribed by AR 70-50 is usedin helicopter designations as follows:

1-11. DESIGNATOR SYMBOLS.

NOTE

All OH-58A and OH-58C model aircraft are nowequipped with the T63-A-720 Engine.

Designator symbols A. OH-58A and C. OH-58C areused in conjunction with text contents, text headingsand illustrations titles to show limited effectivity of the

material. One or more designator symbols may follow atext heading or illustration title to indicate proper effec-tivity, unless the material applies to all series and conf g-urations within the manual. If the material applies to allseries and conf gurations, no designator symbols will beused. Where practical, descriptive information is con-densed and combined for all models to avoid duplica-tion.

NOTE

Armament subsystems are no longer applicableto OH-58A/C aircraft. All references to arma-ment subsystems have been removed from thismanual.

1-12. USE OF WORD SHALL, SHOULD, AND MAY.

Within this technical manual the word “shall” is used toindicate a mandatory requirement. The word “should” isused to indicate a non-mandatory, but preferred, methodof accomplishment. The word “may” is used to indicatean acceptable method of accomplishment.

1-2 Change 10

TM 55-1520-228-10

CHAPTER 2HELICOPTER AND SYSTEMS DESCRIPTION

AND OPERATIONS

SECTION I HELICOPTER

2-1. GENERAL.

The OH-58A/C helicopter (f gure 2-1 A. and f gure 2-2C.) is a single engine, observation type helicopter de-signed for landing and takeoff from prepared or unpre-pared surfaces. The fuselage consists of the forwardsection, intermediate or transition section, and the aftor tailboom section. The forward section provides thecabin and fuel cell enclosure as well as pylon support.Entrance to the cabin is provided by two doors on eachside. The pilot station (f gure 2-3 A. and f gure 2-4 C.)is located on the right and the copilot/observer station islocated on the left side of the helicopter. The area aft ofthe pilot and copilot may be used as a cargo/passen-ger compartment. The intermediate section supportsthe engine and includes the equipment and electroniccompartment. The tailboom supports the horizontal sta-bilizer, vertical stabilizer, and tail rotor. The basic struc-ture of the forward section consists of a lower-curvedhoneycomb sandwich panel and an upper longitudinalaluminum beam. The core of the sandwich structure isaluminum alloy throughout. The faces are aluminum al-loy except in the fuel cell region, where they are f ber-glass. The aluminum alloy sandwich panel is capable ofwithstanding the specif ed design cargo loadings, whilethe f berglass sandwich supports the fuel cell pressures.The rotor, transmission, and engine are supported bythe upper longitudinal beam. The upper and lower struc-tures are interconnected by three fuselage bulkheadsand a centerpost to form an integrated structure. Themost forward and aft bulkheads act as carry-throughstructure for the skid landing gear crosstubes. The tail-boom is a monocoque structure with aluminum skin andaluminum substructure.

a. Dimensions. Principal dimensions of the heli-copter areas are shown in f gure 2-5.

b. Turning Radius and Ground Clearance. (Referto f gure 2-6.)

c. Weights. The helicopter weight empty and grossoperating weight will change according to the conf gu-ration or equipment installed for the type of mission tobe performed. Refer to Chapter 6, Weight/Balance andLoading.

d. Crew Con guration. The crew consists of thepilot alone, pilot and copilot, or pilot and observer.

2-2. PASSIVE DEFENSE.

The armor protection is a combination of ceramic andf berglass composite with a small amount of dual hard-ness steel. The armor protection is removable.

Crew Protection.Armor protection is furnished forthe pilot and copilot and consists of panels on seat bot-tom, seat back, and outboard side of each seat.

2-3. LANDING GEAR SYSTEM.

a. Standard System. The landing gear system isa skid type, consisting of two laterally mounted archedcrosstubes, attached to two formed longitudinal skidtubes. Then landing gear structure members are madefrom formed aluminum alloy tubing with steel skid shoesto minimize skid wear. The gear assembly is attachedwith straps/clamps at four points to the fuselage struc-ture, therefore, gear removal for maintenance can easilybe accomplished. The manually retractable and quicklyremovable wheel assemblies have been provided tofacilitate helicopter ground handling operations.

b. High Skid Gear. The high skid gear, when in-stalled, will provide an approximate additional 14 inchesof ground clearance. This will improve landings to beaccomplished in snow and rough terrain areas.

Change 14 2-1

TM 55-1520-228-10

1. Anti-Collision Light 11. Fuel Filler Cap

2. Main Rotor Hub and Blades 12. Aft Engine Cowling

3. Engine Oil Tank Drain Access Door 13. Position Light (Green)

4. Tail Rotor Hub and Blade 14. Horizontal Stabilizer

5. Position Light (White) 15. Vertical Fin

6. Tail Skid 16. Battery and Avionics Compartment Door

7. Position Light (Red) 17. Passenger Door (Left)

8. Forward Transmission Fairing 18. Copilot Door

9. Pitot Tube 19. Left Static Port

10. Landing Gear

Figure 2-1. General Arrangement A. (Sheet 1 of 2)

2-2 Change 12

TM 55-1520-228-10

20. Windshield 31. Lower Cutter Assembly21. Tail Rotor Driveshaft 32. Pilot Door22. Tail Rotor Gearbox 33. Passenger Door (Right)23. Tail Rotor Driveshaft and Cover (if installed) 34. FM Homing Antenna (Right Side)24. Engine Exhaust 35. Battery Vent25. Engine Air Inlet 36. External Power Receptacle26. Forward Transmission Fairing Inspection Door 37. Ground Receptacle27. Upper Cutter Assembly 38. FM Homing Antenna (Left Side)28. Free Air Temperature (FAT) Gage 39. Landing Light29. Windshield Def ector/Cutter Assembly30. Right Static Port

Figure 2-1. General Arrangement A. (Sheet 2 of 2)

Change 10 2-3

TM 55-1520-228-10

1. Position Light (Green) 17. Vertical Fin2. Horizontal Stabilizer 18. Lower Anti-Collision Light3. Aft Engine Cowling 19. Aft Proximity Warning Antenna4. Infrared Suppression Shield 20. ADF Sensor Antenna5. Aft Engine Cowling 21. ADF Loop Antenna6. Upper Anti-Collision Light 22. Landing Gear7. Forward Transmission Fairing 23. Radar Warning Blade Antenna8. Pilot Tube 24. Radar Altimeter Antenna9. Right Forward Radar Warning Antenna 25. Marker Beacon Antenna10. Door Lock 26. Transponder Antenna11. Fuel Filler Cap 27. UHF Antenna12. Left Forward Radar Warning Antenna 28. Landing Light13. Left Aft Radar Warning Antenna 29. Upper Cutter Assembly14. Position Light (Red) 30. Windshield Def ector/Cutter Assembly15. Position Light (White) 31. Lower Cutter Assembly16. Tail Skid

Figure 2-2. General Arrangement C. Typical (Sheet 1 of 2)2-4 Change 14

TM 55-1520-228-10

32. Infrared Engine Exhaust 45. Tail Rotor Driveshaft Cover33. FM No. 2 Antenna 46. Tail Rotor Blade and Hub34. Windshield (Flat Glass) 47. Tail Rotor Gearbox35. Right Static Port 48. VOR Antenna36. Pilot Door 49. Battery and Avionics Compartment Door37. Passenger Door 50. Step38. Battery Vent 51. FM Homing Antenna39. External Power Receptacle 52. Passenger Door40. Main Rotor Blades and Hub 53. Copilot Door41. Free Air Temperature (FAT) Gage 54. Left Static Port42. Forward Transmission Fairing Inspection Door 55. NVG Position Lights43. Engine Air Inlet 56. Tail Cone44. Engine Oil Tank Drain Access Door

Figure 2-2. General Arrangement C. Typical (Sheet 2 of 2)

Change 12 2-5

TM 55-1520-228-10

1. Copilot Door Emergency Jettison Handle 9. Pilot Cyclic Stick

2. Overhead Console 10. Pilot Seat

3. Fuel Shutoff Valve 11. Inertia Reel Control Handle

4. Free Air Temperature (FAT) Gage 12. Pilot Collective Stick

5. Pilot Door Emergency Jettison Handle 13. Collective Friction Control Adjustment

6. Instrument Panel 14. Pedestal

7. Magnetic Compass 15. Copilot Seat

8. Anti-Torque Pedals 16. Ignition Key Lock Switch

Figure 2-3. Compartment Diagram A. (Sheet 1 of 2)

2-6

TM 55-1520-228-10

17. Governor RPM Switch 25. Radio Transmit Switch

18. Search/Landing Lights 26. Not Used

19. Starter Switch 27. Not Used

20. Engine Idle Release Control 28. Not Used

21. Inertia Reel 29. Not Used

22. Inertia Reel Control Handle 30. Force Trim Switch

23. Not Used 31. Throttle

24. ICS Switch 32. Controllable Landing Light Switch

Figure 2-3. Compartment Diagram A. (Sheet 2 of 2)

Change 14 2-7

TM 55-1520-228-10

NOTE

Round glass model shown

1. Copilot Door Emergency Jettison Handle 12. Anti-Torque Pedal Adjuster

2. Overhead Console 13. Inertia Reel Control Handle

3. Fuel Shutoff Valve 14. Pilot Collective Stick

4. Free Air Temperature (FAT) Gage 15. Collective Friction Control Adjustment

5. Pilot Door Emergency Jettison Handle 16. Console

6. Instrument Panel 17. Copilot Seat

7. Magnetic Compass 18. Copilot Collective Stick

8. Pilot Cyclic Stick 19. Copilot Anti-Torque Pedals

9. Pilot Anti-Torque Pedals 20. Copilot Cyclic Stick

10. Cyclic Friction Control Adjustment 21. Glareshield

11. Pilot Seat

Figure 2-4. Pilot and Copilot/Observer Station Diagram (Sheet 1 of 3)2-8 Change 14

TM 55-1520-228-10

22. Not Used 26. ICS Switch

23. Not Used 27. Radio Transmit Switch

24. Not Used 28. Not Used

25. Force Trim Switch 28.1 Not Used

25.1 Not Used

Figure 2-4. Pilot and Copilot/Observer Station Diagram (Sheet 2 of 3)

Change 10 2-9

TM 55-1520-228-10

29. Deleted

30. Starter Switch

31. Governor RPM Switch

32. Search/Landing Lights

33. Engine Idle Release Control

34. Controllable Landing Light Switch

35. Deleted

Figure 2-4. Pilot and Copilot/Observer Station Diagram (Sheet 3 of 3)

2-10 Change 14

TM 55-1520-228-10

Figure 2-5. Principal Dimensions (Sheet 1 of 2)

Change 13 2-11

TM 55-1520-228-10

HEIGHT STANDARDSKID GEAR

HIGH SKIDGEAR

FLOATGEARA.

1. Forward Tip of Main Rotor (Static Position to Groundwith Droop) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9 ft. 6.0 in. 10 ft. 0.0 in. 9 ft. 7.9 in.

2. Forward Tip of Main Rotor to Ground (Tie-Down) . 12. ft. 0.0 in. 12 ft. 6.0 in. 12 ft. 1.9 in.

3. Forward Tip of Main Rotor to Ground (Tie-Down) . 6 ft. 8.0 in. 7 ft. 2.0 in. 6 ft. 10.0 in.

4. Ground to Top of Main Rotor Reservoirs . . . . . . . . . 9 ft. 7.0 in. 10 ft. 9.0 in. 10 ft. 10.0 in.

5. Bottom of Cabin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.0 in. 27.0 in. 28.0 in.

6. Top of Vertical Stabilizer . . . . . . . . . . . . . . . . . . . . . . . . 8 ft. 1.5 in. 10 ft. 1.5 in. 11 ft. 1.0 in.

7. Tail Skid to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ft. 4.4 in. 3 ft. 4.4 in. 4 ft. 4.0 in.

8. Lower Cutter to Ground . . . . . . . . . . . . . . . . . . . . . . . . 12.0 in. 2 ft. 2.0 in. 2 ft. 3.0 in.

9. Upper Cutter to Ground . . . . . . . . . . . . . . . . . . . . . . . . 7 ft. 9.5 in. 9 ft. 9.5 in. 9 ft. 10.5 in.

WIDTH

10. Skid Gear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 ft. 5.4 in. 7 ft. 3.0 in. 11 ft. 6.1 in.

11. Horizontal Stabilizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 ft. 5.2 in. No Change No Change

DIAMETERS

12. Main Rotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 ft. 4.0 in. No Change No Change

13. Tail Rotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 ft. 5.0 in. No Change No Change

LENGTH

14. Overall (Main Rotor Fore and Aft) to Aft End of TailSkid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

40 ft. 11.8 in. No Change No Change

15. Nose of Cabin to Aft End of Tail Skid . . . . . . . . . . . . . 32 ft. 2.0 in. No Change No Change

16. Nose of Cabin to Center Line 8 ft. 10.1 of MainRotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8 ft. 10.1 in. No Change No Change

17. Skid Gear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 ft. 1.3 in. 10 ft. 4.2 in. 19 ft. 5.0 in.

18. Nose of Cabin to Center Line of Forward CrossTube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 ft. 0.0 in. 5 ft. 9.4 in. 5 ft. 11.7 in.

19. Nose of Cabin to Center Line of Aft Forward CrossTube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10 ft. 9.0 in. 10 ft. 6.3 in. 10 ft. 8.7 in.

20. Pitot Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.8 in. No Change No Change

* Check antennas that may protrude lower

Figure 2-5. Principal Dimensions (Sheet 2 of 2)

2-12 Change 12

TM 55-1520-228-10

Figure 2-6. Turning Radius and Ground Clearancec. A. Float Gear. The f oat landing gear (f gure 2-7)

consists of two streamlined multi-cell inf atable f oats,f oat support tubes, crosstubes, and necessary f ttingsrequired to equip the helicopter for water landings. Atriangular plate is attached to the tail skid for added con-trollability and protection of the tail rotor in the event of atail low water landing. Landing may be made on smoothsurfaces that do not have protrusions that could damagef oats.

d. Tail Skid. A tubular steel tail skid is attached tothe lower section of the vertical f n and provides protec-tion for the tail rotor in landings by indicating a tail lowcondition.

2-4. COCKPIT AND CABIN DOORS.

Inadvertent jettisoning of cockpit doors is pos-sible if jettison handle is utilized as a handhold,or hand rest during f ight.

Four entrance doors are provided for access to the air-craft interior. The doors are of bonded sheet metal con-struction with acrylic plastic windows. Each door maybe jettisoned by means of emergency jettison handle.All four doors are provided with door lock devices. Thepilot door has a padlock while the other three doors haveloop locking devices (f gure 2-8).

Change 14 2-13

TM 55-1520-228-10

Figure 2-7. Float Gear Equipped Helicopter A.

2-14

TM 55-1520-228-10

Figure 2-8. Locking Devices for Doors

2-15

TM 55-1520-228-10

2-5. SEATS.

a. Pilot and Copilot/Observer Seats. The pilotand copilot/observer seats are constructed of tubingand stretched nylon material. Each seat is equippedwith provisions for cushions, safety belts, and shoulderharness. An inertia reel, with a manually operated con-trol handle, is incorporated on each seat. The inertiareel is a mechanical restraining device that is designedto hold pilot in a normal seated position during anymaneuver which would tend to pitch the pilot forward.Each reel is connected to a shoulder harness with aweb strap. An automatic locking mechanism, a webbingroller, and a manual control are incorporated in eachunit (f gure 2-3).

b. Passenger Seats. The passenger seats areconstructed of aluminum honeycomb panels and forman integral part of the airframe. The center panel of theseat back is removable to gain access to fuel cell. Seatsare equipped with shoulder harness, safety belts, andcushions. Seating is provided for two passengers orwithout seats, space is provided for cargo (f gure 2-3).

2-6. WIRE STRIKE PROTECTION SYSTEM(WSPS).

Flight with the landing light in other than the fullystowed position on OH-58A/C aircraft may de-grade the effectiveness of the Wire Strike Pro-tection System (WSPS). When use of the con-trollable landing light is not anticipated, it shouldbe in the fully stowed position.

The WSPS provides protection against frontal impactswith horizontally strung mechanical and power trans-

mission wires. The basic system consists of an uppercutter assembly, a windshield def ector/cutter assembly,and a lower cutter assembly (f gure 2-1 and f gure 2-2).The windshield def ector/cutter assembly, consisting ofa sawtooth equipped aluminum extrusion, provides de-f ection mechanism into the upper cutter while simul-taneously abrading thus weakening wire and providesadditional structural support for the upper cutter mount-ing. The mechanical cutter assembly (upper and lower)(f gure 2-9) consists of a sawtooth equipped def ectorsection, providing def ection/abrading feature similar tothe windshield def ector section, leading into the primarywire cutting mechanism — wedge type cutting bladespositioned to provide the nec

operator’smanual armymodeloh-58a/c helicopter · tm 55-1520-228-10, 17 january 1989, is changed...

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