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 49-52-05
 ALL  ú ú 01 Page 701 ú Jun 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 APU DIVERTER VALVE CONTROL - REMOVAL/INSTALLATION
_________________________________________________
 1.  General_______
 A.  This procedure contains the tasks for the removal and the installation of the diverter valve control.
 B.  The diverter valve control is on the top right side of the load compressor case. There is sufficient space on the side of the APU to get access to the diverter valve control.
 C.  You can get access to the diverter valve control through the APU access doors.
 TASK 49-52-06-004-001
 2.  APU Diverter Valve Control Removal (Fig. 401)__________________________________
 A.  Equipment
 (1)  
Container - for fuel, 1 U. S. quart (1 liter) capacity

 B.  
References

 (1)  
WDM 49-11-18, 49-52-11

 (2)  
SSM 49-11-01, 49-52-01

 (3)  
AIPC 49-16-00, Fig. 2, AIPC 49-52-06, Fig. 1

 C.  
Access

 (1)  
Location Zones
 221 Control Cabin - Left
 222 Control Cabin - Right
 310 Fuselage - Station 2360 to Station 2792

 (2)  
Access Panels
 317AL APU Access Door - Left
 318AR APU Access Door- Right

 D.  
Procedure

 S 864-002
 (1)  
Make sure the APU control switch on the P5 panel is OFF and attach a DO-NOT-OPERATE tag.

 S 864-003

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

 (a)  
P6-2 Main Power Distribution Panel
 1) 6K18, APU ALTN CONT

 (b)  
P83 Aft APU Equipment Control and Circuit Breaker Panel 1) APU PRIMARY CONT

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 49-52-06
 ALL  ú ú 01 Page 401 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

B
5. FUEL SUPPLY TUBE 
6. FUEL RETURN TUBE 
7. NIPPLE 
7. NIPPLE  8. PACKING 
25. ADAPTER  2. BRACKET  9. FUEL RETURN PORT 
24A. PACKING  1A. BOLT  8. PACKING  11. DIVERTER VALVE 

3. BOLT CONTROL
4. FUEL SUPPLY 10. NUT
PORT 26. PACKING
10. NUT 27. RING
30. SENSE LINE
28.
NUT

29.
ELBOW

12. PACKING
24. PACKING
15. Pc AIR
3. BOLT PORT1. BOLT
23. ELECTRICAL SOCKET 13. REDUCER
14. Pc AIR22. ELECTRICAL 10. NUT21. DRAIN
CONNECTOR,  TUBE
PORTP21 16. PACKING
20. DRAIN TUBE  17. RING
18. NUT
LOAD COMPRESSOR CASE 19. ELBOW FWD
B

Diverter Valve Control Installation
Figure 401

F58399
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 49-52-06
 ALL  ú ú 03 Page 402 ú Feb 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 014-004
 (3)  
Open the left APU access door, 317AL, and right APU access door, 318AR:

 (a)  
While you hold the two APU access doors in the closed position, open the six latches on the right access door.

 NOTE: The left access door will open fully and the right
____ access door will drop approximately one inch (2.5 cm) from the fuselage frame when the last latch is opened.
 NOTE: A lanyard is attached to the aft end of the right access
____ door to hold the access door to the APU compartment bulkhead.
 CAUTION: BE CAREFUL NOT TO MOVE THE TWO APU ACCESS DOORS TO THE
_______ OUTBOARD SIDE FROM THE FULL OPEN POSITION. THE FULL OPEN POSITION IS WHERE THE APU ACCESS DOOR IS DOWN AND THE TWO HOLD-OPEN RODS ARE CONNECTED TO THE TWO BRACKETS ON THE APU COMPARTMENT BULKHEAD. DAMAGE TO THE ELEVATOR CONTROL SURFACES CAN OCCUR.
 (b)  
Open the left access door to the fully open position and remove the two hold-open rods from the two clips.
　
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