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TM 9-2350-287-34
CHAPTER 12
AUXILIARY POWER UNIT
Paragraph
Page
Number
Paragraph Title
Number
12-1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... 12-1
12-2
APU Chain Cover Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-1
12-3
APU Gearcase Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-4
12-4
APU Generator Brushes Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-17
12-1. GENERAL
This chapter provides maintenance instructions to repair the auxiliary power unit (APU) chain cover and APU
gearcase. APU engine maintenance is covered in TM 9-2815-221-34&P, and APU generator maintenance is covered
in TM 9-2920-224-34&P.
12-2. APU CHAIN COVER REPAIR.
This Task Covers:
a. Removal
b. Cleaning and Inspection
c. Installation
Initial Setup:
Tools/Test Equipment:
• Sealing compound (Item 22, Appendix B)
• Drain pan (Item 12, Appendix D)
• Gasket (Item 20, Appendix H)
• General mechanic’s tool kit (Item 19, Appendix D)
• Gasket (Item 31, Appendix H)
• Lockwasher (17) (Item 44, Appendix H)
Materials/Parts:
• Drycleaning solvent (Item 9, Appendix B)
Equipment Conditions:
• Sealant adhesive (Item 3, Appendix B)
• APU on crew work surface.
a.
1.
2.
3.
4.
REMOVAL
Position drain pan under drain plug (7). Remove
plug (7) and gasket (8) from chain cover (2) and
drain. Discard gasket.
NOTE
Perform steps 2 and 3 only if replacing
cover.
Remove four screws (5) and data plate (6) from
cover (2).
Remove breather(1), breather elbow (10), and fill
plug (9) from cover (2).
Remove 15 screws (4) and Iockwashers (3) from
cover (2). Discard Iockwashers.
12-1
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