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 S 226-010
 (5)  Use a feeler gage to make sure the clamp opening for the QAD ring is 0.103-0.330 inch.
 NOTE: If the mounting flange for the APU-driven generator shows
____ worn areas, a opening tolerance of 0.062-0.330 inch is permitted.
 S 436-011
 (6)  
Install lockwire on the tension bolt on the QAD ring.

 S 416-018

 (7)  
Close the APU access doors:

 (a)  
Do a visual check of the APU bus bars:
 1) Make sure the bus bars are not damaged.
 2) Make sure no metal parts touch the bus bars.
 3) Make sure the bus bars do not touch each other.

 (b)  
Disengage the support rods for the APU access doors.

 (c)  
Put the support rods in the clips on the inner side of the APU access doors.

 (d)  
Make sure the insulation covers correctly attach to the APU compartment firewall.

 (e)  
Close the APU access doors.

 (f)  
Close the latches on the APU access doors.

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 24-21-02
 ALL  ú ú 03 Page 605 ú Feb 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 APU-DRIVEN GENERATOR - REMOVAL/INSTALLATION
___________________________________________
 1.  General_______
 A.  This procedure has two tasks. One task is the removal of the APU-driven generator (G2 or G3). The other task is the installation of the generator.
 B.  The APU-driven generators are installed on the load gearbox of the APU. They are attached with quick attach-detach (QAD) rings.
 C.  Access to the APU-driven generators is through the APU access doors.
 TASK 24-21-03-004-001
 2.  APU-Driven Generator Removal (Fig. 401)____________________________
 A.  Special Tools and Equipment
 (1)  
OHME65B98605-1 - Sling, APU Generator (with telescoping spreader bar)

 B.  
Standard Tools and Equipment

 (1)  
Fishpole Hoist - PF Industries Inc., 9320 15th Avenue South, Seattle, WA 98108

 C.  
References

 (1)  
AIPC 24-21-03 Fig. 1

 (2)  
AIPC 49-51-02 Fig. 1

 (3)  
WDM 24-21-51, WDM 24-21-61

 (4)  
SSM 24-21-05

 (5)  
SSM 24-21-06

 D.  
Access

 (1)  
Location Zone
 317 APU Compartment, LH
 318 APU Compartment, RH

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

 E.  
Procedure

 S 424-103
 (1)  Make sure the APU switch, on the P5 panel, is set to OFF and install DO-NOT-OPERATE identifier.
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 ALL  ú ú 06 Page 401 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

SEE A
SEE B
A
2.  APU GENERATOR 2, G3
4.  WASHER
1.  ELECTRICAL SEE C (4 LOCATIONS)
CONNECTOR, 5. SCREW
DG3B (4 LOCATIONS)

6.  AIR INLET DUCT
3.  AIR
EXHAUST DUCT

7.  
CLAMP

8.  
COOLING FAN EXIT MANIFOLD

25. ELECTRICAL CONNECTOR, DG3A
24. CLAMP
21.
NUT

22.
WASHER

23.
SCREW
(2 LOCATIONS)

 

10. ELECTRICAL CONNECTOR, DG2B
20. EXHAUST DUCT 11. APU GENERATOR 1, G2
EXTENSION
SEE D
19. WASHER
(4 LOCATIONS)

12. PHASE LEAD
18. SCREW
(2 LOCATIONS)

13. PHASE LEAD
17. TERMINAL NUT
(4 LOCATIONS)

14. ELECTRICAL CONNECTOR, DG2A
16. TERMINAL 15. CLAMP
BLOCK COVER FWD
APU LOAD GEARBOX
B
APU-Driven Generator Installation
Figure 401 (Sheet 1)

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