747-400
FAULT ISOLATION/MAINT MANUAL

AND THE ACCESSORY GEARBOX) BETWEEN FUEL PUMP OIL SEAL IS INSTALLED (DRIVE SPUR GEARSHAFT FUEL PUMP 
FWD 
F 
CARBON ADAPTER BREATHER SEAL 
FWD G  ACCESSORY GEARBOX 

APU Engine Lubrication System - Component Location
Figure 102 (Sheet 3)

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A
747-400 MAINTENANCE MANUAL
 ACCESSORY GEARBOX BREATHER ADAPTER CARBON FACE SEAL
___________________________________________________ REMOVAL/INSTALLATION
____________________
 1.  General_______
 A.  This procedure contains the tasks for the removal and the installation for the carbon face seal in the breather adapter on the accessory gearbox.
 B.  The face seal is referred to as the carbon seal.
 C.  The seal is on the breather adapter that connects the breather tube to the accessory gearbox. You can get access to the seal through the APU access doors.
 TASK 49-27-01-004-015
 2.  Accessory Gearbox Breather Adapter Carbon Face Seal Removal (Fig. 401)___________________________________________________________
 A.  Special Tools and Equipment
 (1)  PWC41343 Puller - Pratt and Whitney Canada Inc.
 1000 Marie Victorin
 Longueuil, Quebec
 Canada J4G 1A1
 Attention: Parts Division

 OR
 Kell-Strom Tool Company Inc. 214 Church Street Wethersfield, CT 06109 USA
 (2)
PWC41445 Support - Pratt and Whitney Canada Inc

 B.  
References

 (1)
IPC 49-31-03 Fig. 1

 C.  
Access

 (1)
Location Zone

 318  APU Compartment-Bottom Side of Air Inlet Plenum, On Accessory Gearbox

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

 D.  
Procedure

 (1)
Do this task: "Drain the APU Oil" (Ref 12-22-02/301).

 S 684-019
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747-400
MAINTENANCE MANUAL

SEE A
3.  VENT TUBE ADAPTER
2. TUBE TRANSFER 
1. ADAPTER BREATHER 
5. PACKING 
9. CLAMP 7. WASHER 6. PACKING 8. NUT  4.  GEARBOX ACCESSORY 
HOSE 10. FLEXIBLE 
BREATHER TUBE (REF) 
A 
Replacement of Breather Adapter Carbon Seal Figure 401 

F58217
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747-400
MAINTENANCE MANUAL

2. BREATHER ADAPTER
Removal of Breather Adapter Carbon Seal
Figure 402

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747-400
MAINTENANCE MANUAL

2. BREATHER ADAPTER
Installation of Breather Adapter Carbon Seal
Figure 403

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