TM 9-2350-256-20
CHAPTER 6: MAINTENANCE OF ELECTRICAL SYSTEMS AND CIRCUITS
6-75 REPLACE/REPAIR BULKHEAD TO AUXILIARY POWER UNIT (APU),
MASTER RELAY, AND RIGGER'S LIGHTS WIRING HARNESS (DUAL VOLTAGE) (11672412)
THIS TASK COVERS
a. Removal
b. Disassembly
c. Assembly
d. Installation
INITIAL SET-UP
Tools:
Parts:
Equipment Condition:
Tool kit, general mechanic's
Lockwashers (20) (Appendix
Air inlet doors removed (see
(Appendix C, item 53)
C, item 116)
paragraph 9-56)
Lockwashers (4) (Appendix G,
item 103)
Lockwashers (4) (Appendix G,
item 105)
WARNING
Be certain MASTER switch is OFF when working on electrical systems to avoid electrical shock and bums.
Connector No.
Electrical Lead To:
Wire No.
1
Bulkhead disconnect
420, 420A, 493, 421,
65, 487, 65, 17, 26
2
Hydraulic pressure switch
61
3
Hydraulic pressure switch
61A
4
APU engine disconnect
421, 65, 487, 65, 66,
62, 478A, 61
5
APU engine disconnect
420, 420A, 493
6
APU wiring harness (11672417)
GND
7
Batteries to master relay, voltage regulators, slave receptacle,
GND
and engine disconnect wiring harness (dual voltage)
(11672413)
8
APU voltage regulator
478A, 62, 61
9
Master relay
81
10
Rigger right service light
17
11
Rigger left service light
17
12
Bulkhead to main engine bracket and rear fuel tank transmitter
26
wiring harness (dual voltage) (11672411)
13
Circuit breaker
K
14
Bulkhead disconnect
48
15
Bulkhead to main engine wiring harness and starter relay
61
wiring harness
16
Bulkhead to main engine wiring harness and starter relay
61A
wiring harness
6-194
