Allison T63-A-5A / T63-A-700 Turboshaft Engine Maintenance Manual – TM 55-2840-231-23

Description

Allison T63-A-5A / T63-A-700 Turboshaft Engine Maintenance Manual

This is the complete Aviation Unit and Aviation Intermediate Maintenance Manual, TM 55-2840-231-23, covering the Allison T63-A-5A (NSN 2840-00-923-6023) and T63-A-700 (NSN 2840-00-179-5536) turboshaft engines. Dated 27 February 1981 and reprinted current through Change 13, this Allison T63 Turboshaft Engine Maintenance Manual was written for technicians supporting the OH-6A and OH-58A observation helicopters, and it goes far beyond a general overview into the actual chapter-by-chapter maintenance detail a shop needs to keep these engines running.

File Details

• Manual type: Aviation Unit (AVUM) and Aviation Intermediate (AVIM) Maintenance Manual
• Document number: TM 55-2840-231-23
• Publication date: 27 February 1981, reprinted current through Change 13
• Language: English
• Page count: 590 pages
• File format: PDF (digital download)
• Brand/models: Allison T63-A-5A and T63-A-700 Turboshaft Engine

Chapters Covered

• Chapter 1 – Engine General
  • Section I – General Information
  • Section II – Equipment Description and Data
  • Section III – Repair Parts, Special Tools, TMDE and Support Equipment
  • Section IV – Service Upon Receipt
  • Section V – Preventive Maintenance Inspections
  • Section VI – Troubleshooting
  • Section VII – General Maintenance Procedures
  • Section VIII – Engine Testing in Mobile or Fixed Facilities
• Chapter 2 – Compressor Section
• Chapter 3 – Combustion Section
• Chapter 4 – Power Turbine
• Chapter 5 – Accessory Gearbox
• Chapter 6 – Fuel System
• Chapter 7 – Electrical System
• Chapter 8 – Oil System
• Chapter 9 – Miscellaneous Equipment/Air System
• Appendix A – References
• Appendix B – Maintenance Allocation Chart
• Appendix C – Special Tools and Test Equipment
• Appendix D – Expendable Supplies and Materials List
• Appendix G – Torque Values and Dimensional Limits, Overhaul and Retirement Schedule
• Appendix H – General Maintenance Practices
• Glossary
• Index

Taken as a whole, this Allison T63-A-700 maintenance manual gives a technician everything needed to work through service upon receipt, preservation and storage, preventive maintenance inspection intervals, symptom-based troubleshooting logic, and section-by-section teardown and reassembly of the compressor, combustion, power turbine, gearbox, fuel, electrical, and oil systems, closing with the torque values and overhaul/retirement schedule an AVIM shop relies on to sign off major work.

Inside the Engine Systems

Section II of Chapter 1 walks through the free-turbine architecture of the T63 – the gas producer fuel control and power turbine governor relationship, the lubrication system, ignition system, anti-icing air, and acceleration bleed air system – with supporting figures for the fuel and control system schematic, the compressor and power turbine sections, and the lubrication schematic. Table 1-3 lists the engine’s leading particulars (dimensions, oil consumption, fuel specifications, design speeds) and Table 1-4 lays out performance ratings at takeoff, normal, 90% normal, 75% normal, start/idle, and flight autorotation conditions – figures a technician needs on hand rather than looking up elsewhere.

Troubleshooting Depth

Section VI of Chapter 1 is built around a Symptom Index (Table 1-8) that maps more than fifty numbered engine, oil system, and anti-icing symptoms – overspeeds, low or high oil pressure, exhaust smoking, faulty torquemeter indication, high TOT, and more – directly to the correct logic-diagram troubleshooting procedure. This is the kind of engine troubleshooting reference that turns a vague pilot report into a specific probable-cause list and a documented corrective action.

Torque Values and Overhaul Data

Appendix G provides the torque values and dimensional limits an intermediate-level shop needs for reassembly: minimum and maximum torque figures in both kg/m and in-lb for shipping container hardware, compressor mounting bolts, combustion case splitline nuts, ignition lead brackets, governor and control air tube fittings, and fuel tube connections, organized by figure reference number, along with the overhaul interval and retirement schedule for time-limited components.

Why This Manual Belongs In Your Shop

Whether you’re supporting an OH-6A, an OH-58A, or simply maintaining a T63-A-5A or T63-A-700 in a museum, collection, or training environment, this Engine Assembly maintenance manual supplies the correct Army-issued procedures, specifications, and torque data rather than guesswork. Getting these numbers right protects the engine and the aircraft it powers – undertorqued fittings and misapplied procedures are exactly what this manual exists to prevent. This T63 turboshaft engine manual downloads instantly as a PDF after purchase, with no shipping and no waiting: read it on a laptop, tablet, or phone in the hangar, or print any page you need at the bench.