TM 9-2350-256-20
CHAPTER 13
MAINTENANCE OF AUXILIARY POWER UNIT (APU)
CHAPTER OVERVIEW
This chapter describes how to remove, service, and install the APU components.
This chapter consists of the following paragraphs:
Para.
Task
Page
13-1
Replace APU Pressure Switch Assembly............................................................................................... 13-1
13-2
Replace/Service APU Engine Air Cleaner, Filter, and Air Intake Tubes.................................................. 13-2
13-3
Replace APU Cooling Air Exhaust ........................................................................................................ 13-4
13-4
Replace APU Identification (ID) Plate ..................................................................................................... 3-5
13-5
Replace APU Engine Fuel Filters........................................................................................................... 13-5
13-6
Replace APU Engine Oil Filter............................................................................................................... 13-8
13-7
Replace/Repair APU Control Box .......................................................................................................... 13-8
When working on the APU, the following must be observed:
WARNING
Unless the APU access door is properly secured by a strap, the access door can swing shut and injure
personnel working on the unit, especially if the spare roadwheel is mounted in place on the hull. To
secure the door, refer to TM 9-2350-256-10. The strap is routed through the lower access door ring
handle and stowed roadwheel hub, and tied to secure the door in the open position.
13-1 REPLACE APU PRESSURE SWITCH ASSEMBLY
THIS TASK COVERS
a. Removal
b. Installation
INITIAL SET-UP
Tools:
Parts:
Equipment Condition:
Tool kit, general mechanic's
Lockwashers (4) (Appendix G,
Center front air inlet grilles
(Appendix C, item 53)
item 130)
removed (see paragraph 9-57)
a. REMOVAL
WARNING
Do not attempt to loosen, tighten, or remove hydraulic fittings or lines when system is pressurized.
13-1
