(o)  
Disconnect the P17 connector (37) from the IGV actuator.

 (p)  
Remove the nut (34), the bolt (35) and the clamp (36) from the bracket on the oil scavenge tube.

 (q)  
Remove the nut (27), the bolt (28), the clamp (29) and the grommet (30) from the bracket on the upper vent tube.

 (r)  
Remove the nut (41) and the bolt (42) and the clamp (43) from the bracket on the lower vent tube.

 (s)  
Disconnect the P22 connector (45) from the J22 connector at the lower bracket (44).

 (t)  
Remove the four screws (49) that attach the J2 connector (48) to the harness bracket.

 (u)  
Disconnect the J2 connector (48) from the harness bracket.

 (v)  
Remove the bolt (46), clamp (47) and lower bracket (44) from the harness bracket.

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

 S 494-176
 (5)  
Install caps and plugs on all the electrical receptacles and connectors for protection.

 S 554-177

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

 S 554-178

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

 TASK 49-14-00-004-179
 7.  APU WITHOUT A WIRE HARNESS JUMPER (POST-PWC-SB 16142); APU Rear Wire Harness Removal (Fig. 404)_____________________________
 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
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 49-14-00
 ALL  ú ú 04 Page 425 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400 MAINTENANCE MANUAL
SEE A 4. P10 CONNECTOR
1.
 BOLT

2.
 SPACER

3.
 CLAMP

20.
 BOLT

21.
 SPACER

22.
 CLAMP

OIL TEMPERATURE
GROUND WIRE (REF)  SENSOR 
19. P11 CONNECTOR  20. BOLT  6. P7 CONNECTOR 
22. CLAMP  5. P5 CONNECTOR 

OIL PRESSURE SWITCH 18. P12 CONNECTOR
17. P9 CONNECTOR
SEE B
7.
 NUT

8.
 BOLT

9.
 CLAMP

SEE C
10.
 P3 CONNECTOR

11.
 BOLT

15. BOLT
12. CLAMP
16. CLAMP
(2 LOCATIONS)
14. J1 CONNECTOR
13. SCREWS (4 LOCATIONS)
A
C36330
APU Rear Wire Harness Installation Figure 404 (Sheet 1)
K64946
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. APU WITHOUT A WIRE HARNESS JUMPER ú

 49-14-00
 (POST-PWC-SB 16142)  ú ú 04 Page 426 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
IGNITION
23. P6 CONNECTOR
EXCITER
1
2
B  24. NUT 27. GROMMET 26. CLAMP 25. BOLT 
28. NUT 30. CLAMP 29. BOLT 

31. P4 CONNECTOR 
41. P22 CONNECTOR 40. SCREW (4 LOCATIONS)  39. J22 CONNECTOR  38. CLAMP 37. SPACER 36. BOLT 35. NUT  34. CLAMP 33. BOLT 32. NUT 
2 1  POST-PWC-SB 16202 PRE-PWC-SB 16202  C  C36340 (MOD) 

APU Rear Wire Harness Installation
Figure 404 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. APU WITHOUT A WIRE HARNESS JUMPER ú

 49-14-00
 (POST-PWC-SB 16142)  ú ú 04 Page 427 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
K62633
A
747-400
MAINTENANCE MANUAL

 (2)  
　
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