D.  
Procedure

 S 864-003
 (1)  
Make sure the APU control switch on the P5 panel is OFF and attach a DO-NOT-OPERATE tag.

 S 014-004

 (2)  
Open the APU access doors:

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

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A

747-400
MAINTENANCE MANUAL

A 
RING 2. RETAINER 
(REF) DRIVE SHAFT (REF) DRIVE PAD GENERATOR GENERATOR  SEAL 1. PLAIN  A 
LIP 

A-A

AC Generator Drive Oil Seal - Removal/Installation
Figure 401

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 (b)  
Open the APU access doors.

 (c)  
Engage the support rods for the APU access doors.

 S 864-006
 (3)  
Remove the electrical power from the airplane (Ref 24-22-00/201).

 S 034-007

 (4)
Disconnect the electrical plugs for the applicable AC generator:

 (a)  
Generator No. 1
 1) DG2A
 2) DG2B

 (b)  
Generator No. 2
 1) DG3A
 2) DG3B

 S 864-008
 (5)  
Apply electrical power to the airplane if it is necessary for other operations (Ref 24-22-00/201).

 S 034-010

 (6)  
Disconnect the coupling that attaches the air exhaust duct on the generator to the upper air exhaust duct.

 S 014-011

 (7)  
Remove these components:

 (a)  
The APU generator QAD ring (Ref 24-21-02/401)

 (b)  
The APU generator (Ref 24-21-03/401).

 S 024-012
 (8)  
Remove the plain seal (1):

 (a)  
Remove the retainer ring (2) from the generator drive shaft on the load gearbox.

 (b)  
Remove the plain seal (1) from the generator drive shaft with the extractor. 1) Discard the seal (1).

 TASK 49-27-05-404-002
 3.  Install AC Generator Drive Oil Seal (Fig. 401)___________________________________
 A. Consumable Materials
 (1)  D00418 Oil - Aircraft Turbine Engine
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 B. References
 (1)  
AMM 24-21-02/401, APU Generator QAD Ring

 (2)  
AMM 24-21-03/401, APU Driven Generator

 (3)  
AMM 24-22-00/201, Manual Control

 (4)  
AMM 49-11-00/201, Auxiliary Power Unit

 C. Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | Plain Seal | 49-27-05 | 01 | 50 | 2.......….......…...................................…...........…......….......1
 D. Access
 (1)  
Location Zone 318 APU Compartment-Load Gearbox Forward Face

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

 E.
Procedure

 S 424-031
 (1)  
Install the plain seal (1):

 (a)  
Lubricate the new plain seal (1) with engine oil.
　
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