(v)  
Remove the front wire harness from the APU engine.

 S 494-127
 (5)  
Install caps and plugs on all the electrical receptacles and connectors for protection.

 (6)  
Seal the APU wire harness in a plastic bag.

 S 554-129

 (7)  
Keep the plastic bag in a strong container until it is time to install the wire harness.

 S 554-128
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A
747-400 MAINTENANCE MANUAL
 TASK 49-14-00-004-132
 3.  APU WITH A WIRE HARNESS JUMPER (PRE-PWC-SB 16142); APU Rear Wire Harness Removal (Fig. 402)_____________________________
 A.  References
 (1)  
WDM 49-11-16, 49-11-17, 49-11-18

 (2)  
SSM 49-11-01

 (3)  
IPC 49-14-00 Fig. 1

 B.  
Access

 (1)  
Location Zone 317 APU Compartment-Aft of Air Inlet Plenum on APU Engine, LH

 318  APU Compartment-Aft of Air Inlet Plenum on APU Engine, RH

 (2)  
Access Panel
 317AL APU Access Door
 318AR APU Access Door

 C.  
Procedure

 S 864-133
 (1)  
Make sure the APU control switch on the P5 panel is OFF and attach a DO-NOT-OPERATE tag.

 S 864-134

 (2)  
Open the circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Supply Panel
 1) 6K18 APU ALTN CONT

 (b)  
P83 Panel, E8 Aft Equipment Center
 1) APU PRIMARY CONT

 S 014-135
 (3)  
Open the APU access doors:

 (a)  
Open the latches on the APU access doors.

 (b)  
Open the APU access doors.

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747-400
MAINTENANCE MANUAL

4. NUT
3. BOLT
SEE A LACING
2. P5 CONNECTOR
TAPE
1. P6 CONNECTOR
IGNITION
SEE B EXCITER
5. WIRE HARNESS
10. BOLT  JUMPER
6. CLAMP
3. BOLT
7.
 NUT

8.
 NUT

18. BOLT
6. CLAMP
9. CLAMP
17. P7A CONNECTOR
16. CLAMP
8. NUT
1  FROM SHEET 2
7. NUT
15. P7 CONNECTOR
14. P3 CONNECTOR
2  FROM SHEET 2
13. J7 CONNECTOR
10. BOLT
8. NUT FWD 11. CLAMP
12. BOLT
11.
 CLAMP

12.
 BOLT

VIEW ON RIGHT SIDE OF ENGINE - REAR WIRE HARNESS

A
APU Rear Wire Harness Installation
Figure 402 (Sheet 1)

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747-400 MAINTENANCE MANUAL
19.
 P10 CONNECTOR

20.
 CLAMP

21.
 BOLT

22.
 BOLT

36. SPACER
20. CLAMP
23. P11 CONNECTOR
31. CLAMP
22. BOLT GROUND TERMINAL (REF)
24. P12 CONNECTOR
29. CLAMP SEE
25. P9 CONNECTOR SHEET 1 1
8. NUT
12. BOLT 26. BOLT
27 CLAMP8. NUT
26.
 BOLT

27.
 CLAMP

29. CLAMP
8. NUT HARNESS 10. BOLT
8. NUT SUPPORT 28. BOLT BRACKET
29.
 CLAMP

30.
 P4 CONNECTOR

34. J1 CONNECTOR  FUEL 
8. NUT  METERING 
35. SCREW  33. BOLT  32. CLAMP  26. BOLT  UNIT  FWD 
　
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