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 49-52-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 
747-400 
MAINTENANCE MANUAL
 S 864-031
 (3)  Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a) P83 Panel, E8 Aft Equipment Center
 1) APU PRIMARY CONT
 (b) P6 Main Power Supply Panel
 1) 6K18 APU ALTN CONT
 S 864-032
 (4)  Remove the DO-NOT-OPERATE tag from the APU control switch on the P5
 panel.
 S 794-034
 (5)  Examine the IGV actuator installation for leakage:
 (a) Do this task: "APU Starting and Operation" (Ref 49-11-00/201).
 (b) During the APU operation, examine the IGV actuator for fuel
 leakage.
 (c) Do this task: "APU Usual Shutdown" (Ref 49-11-00/201).
 (d) If you found fuel leakage, repair the cause of it.
 S 414-033
 (6)  Close the APU access doors:
 (a) Do a visual check of the EGT 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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 49-52-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 DIVERTER VALVE - REMOVAL/INSTALLATION
_____________________________________
 1.  General_______
 A.  This procedure contains the tasks for the removal and the installation of the APU diverter valve.
 B.  The diverter valve is on the lower aft section of the APU engine. You can get access to the diverter valve through the APU access doors.
 TASK 49-52-04-004-001
 2.  APU Diverter Valve Removal (Fig. 401)__________________________
 A.  References
 (1)  
AIPC 49-52-00, Fig. 1, AIPC 49-52-04, Fig. 1, AIPC 49-52-08, Fig. 1

 B.  
Access

 (1)  
Location Zone 317 APU Compartment-Aft Lower Side of Engine, LH 318 APU Compartment-Aft Lower Side of Engine, RH

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

 C.  
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 Main Power Supply Panel
 1) 6K18 APU ALTN CONT

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

 

 S 014-004
 (3)  
Open the APU access doors:

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

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 49-52-04
 ALL  ú ú 01 Page 401 ú Jun 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

SEE A
4. CLAMP 
3.  DIVERTER 2. PACKING VALVE 
PACKING2. 
1. ADAPTER 
4. CLAMP  SEE  B 
13. LINK  A STRAIGHT PIN 11. PIN 12. COTTER  10. 9. 8. PACKING NIPPLE P3 TUBE  P3 TUBE 6. NIPPLE 5. 
7. PACKING 
B  PORTS (REF) P3 CONNECTION 
Diverter Valve Installation Figure 401 

F58238
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