Bell OH-58A User Manual

TM 55-1520-228-BD
TECHNICAL MANUAL
OPERATORS, AVIATION UNIT,
AND AVIATION
INTERMEDIATE MAINTENANCE
FOR
HELlCOPTER,
OBSERVATION
OH-58A & OH-58C
ITEM NSN
INSIDE FRONT COVER
This publication supersedes
TM 55-1520-228-BD dated
17 August 1990.
CHAPTER 1. GENERAL INFORMATION
CHAPTER 2. ASSESSING BATTLEFIELD DAMAGE
CHAPTER 3. GENERAL REPAIR
CHAPTER 4. AIRFRAME
CHAPTER 5. ALIGHTING GEAR
CHAPTER 6. POWER PLANT
CHAPTER 7. ROTORS
CHAPTER 8. DRIVE TRAIN SYSTEM
CHAPTER 9. HYDRAULIC SYSTEM
CHAPTER 10: INSTRUMENT SYSTEMS
CHAPTER 11. ELECTRICAL SYSTEM
CHAPTER 12. FUEL SYSTEM
CHAPTER 13. FLIGHT CONTROLS
CHAPTER 14. UTILITY SYSTEM
CHAPTER 15. ENVIRONMENTAL CONTROL SYSTEM
CHAPTER 16. MISSION EQUIPMENT
CHAPTER 17. EMERGENCY EQUIPMENT
APPENDIX A . REFERENCES
APPENDIX B. SPECIAL OR FABRICATED TOOLS
APPENDIX C. EXPENDABLE/DURABLE SUPPLIES
& MATERIALS
APPENDIX D. SUBSTITUTE MATERIALS/PARTS
APPENDIX E. BDAR TRAINING PROCEDURES
HEADQUARTERS, DEPARTMENT OF THE ARMY
4 January 1991
APPENDIX F. AVIONICS CONFIGURATIONS

Bell OH-58A Specifications

General

Brand	Bell
Model	OH-58A
Category	Toy
Language	English

Summary

Chapter 1: General Information

Section I. Introduction

Discusses the purpose, scope, application, and definitions related to Battlefield Damage Assessment and Repair (BDAR).

Section II. Standards and Practices

Outlines BDAR characteristics, waiver of precautions, and operating characteristics for mission capability.

Chapter 2: Assessing Battlefield Damage

Section I. Introduction

Provides guidelines for assessing battlefield damage to the OH-58 helicopter and directs to appropriate fixes.

Section II. General Fault Assessment Table

Presents a flowchart to guide the assessment of general aircraft faults and determine next steps.

Chapter 3: General Repairs

Chapter 4: Airframe

Section I. Introduction

Details information on battle damage assessment and expedient repair procedures for the OH-58 helicopter airframe.

Section II. Expedient Structural Repairs

Covers procedures for performing expedient structural repairs and field fixes on the airframe.

Chapter 5: Alighting Gear

Section I. Introduction

Provides information for deferring repair and expedient field fixes for battle-damaged alighting gear assembly.

Section II. Skid Tube

Details information on skid damage and general information regarding hard landings and sudden stops.

Chapter 6: Power Plant

Section I. Introduction

Describes the OH-58 helicopter power plant and lists BDAR repair procedures for engine components.

Section II. Component Expedient Fixes

Provides various expedient fixes to restore helicopter mobility in case of engine failure.

Chapter 7: Rotors

Section I. Introduction

Contains fault assessment and expedient repair procedures for main and tail rotor blades.

Section II. Repairs

Lists limited repairs developed for rotor system components where replacement is not feasible.

Chapter 8: Drive Train System

Section I. Introduction

Describes the drive train system and lists BDAR repair procedures for damage.

Section II. Repair

Details limited repairs for drive train system damage where replacement is not feasible.

Chapter 9: Hydraulic

Section I. Introduction

Explains the OH-58 hydraulic system and lists assessment procedures and repair index.

Section II. Lines and Hoses

Provides field fixes applicable to hydraulic system hoses and tubing.

Chapter 10: Instruments

Chapter 11: Electrical and Avionics System

Section 1. Introduction

Covers methods for assessing battle damage, deferring repair, and repairing electrical and avionics systems.

Section II. Electrical and Avionics Wiring Damage

Provides procedures for repairing damaged electrical and avionics wiring in a combat environment.

Chapter 12: Fuel System

Section I. Introduction

Describes the OH-58 fuel system and lists assessment procedures and repair index.

Section II. Lines and Hoses

Provides general information on replacement lines, hoses, O-rings, and fuel substitutions.

Chapter 13: Flight Controls

Section I. Introduction

Explains the flight control system and lists BDAR procedures for flight control tubes.

Section II. Tubes, Flight Control

Details repair procedures for flight control tubes, including splicing and fabrication.

Chapter 14: Utility System

Section I. Introduction

Describes the de-icing system and lists BDAR fixes for de-icing system components.

Section II. De-Ice Valve or Control

Provides repair options for damage to the de-ice control rod.

Chapter 15: Environmental Control System

Section I. Introduction

Covers BDAR procedures for heat, vent, bleed air, and defogging systems on the OH-58A/C.

Section II. Rigid Plastic Ventilation Duct

Details repair procedures for holes or cracks in rigid plastic ventilation ducts.

Chapter 16: Mission Equipment

Chapter 17: Emergency Equipment

Appendix A References

Appendix B Special or Fabricated Tools

Section I. General

Lists special tools and test equipment contained in BDAR kits.

Section II. Tools

Provides special tool listings to enhance battlefield damage assessment and repairs.

Appendix C Expendable/Durable Supplies and Materials List

Section I. Introduction

Explains the scope and columns of the expendable supplies and materials list for BDAR fixes.

Section II. Expendable Supplies and Materials List

Lists expendable supplies and materials needed to make BDAR fixes on the OH-58 helicopter.

Appendix D Substitute Materials/Parts

Section I. Introduction

Explains the scope and general information regarding substitute materials and parts for BDAR fixes.

Section II. Fuels

Explains the use of substitute fuels for the OH-58 helicopter and lists primary, alternate, and expedient fuels.

Appendix E BDAR Fixes Authorized For Training

Appendix F Avionics Configurations

Section I. Introduction

Lists and depicts avionics components, cable routes, and wiring terminations for the OH-58 helicopter.