TM 1-1520-238-23
15-4
Change 3
SECTION I.
AUXILIARY POWER SYSTEM MAINTENANCE
15.1.
AUXILIARY POWER SYSTEM COMPONENTS INSPECTION
15.1.1. Description
This task covers:
Inspection.
15.1.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
9/64-inch L-handle socket head screw key (item 188,
App H)
Personnel Required:
67R
Attack Helicopter Repairer
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 1-1500-204-23
TM 1-2835-213-23
TM 55-1500-323-24
TM 55-1500-335-23
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access panels removed as necessary
15.1.3. Inspection
NOTE
For APU limits or allowable repairs not listed in this chapter refer to TM 1-2835-213-23.
a. Check APU enclosure for delaminated or cracked panels, covers, and bulkhead (para 2.12).
b. Check APU enclosure for loose, missing, or damaged hook-and-pile fasteners, stud fasteners, turn-
lock receptacles, nutplates, doublers, seals, and clips (TM 1-1500-204-23).
c. Check all APU components for dents, cracks, damaged connectors, loose or missing hardware, and
leaks. Check gear case line for leakage, five drops per hour maximum allowable.
d. Check all APU electrical connectors and wiring for security, damage, loose or missing hardware,
fraying, and chaffed or missing insulation (TM 55-1500-323-24).
e. Check all APU components for crossed, stripped, or galled threads. None allowed.
f. Check APU hydraulic starter mounting areas for cracks. None allowed.
(1) Fluorescent-penetrant inspect if cracks are suspected (TM 55-1500-335-23).
g. Check APU hydraulic starter for leaks. Outboard seal shall not exceed one drop in FIVE MINUTES.
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