24-11-00
 ALL  ú ú 01 Page 102 ú Dec 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
FAULT ISOLATION/MAINT MANUAL

RIGHT THRUST SEE F
REVERSER HALF 416 (ENG 1)
426 (ENG 2) INTERMEDIATE 436 (ENG 3) CASE (REF) 446 (ENG 4)
SEE D
FWD
SEE EIDG AIR/OIL HEAT EXCHANGER
IDG AIR/OIL HEAT EXCHANGER VALVE, V350 D
E
INTERMEDIATE CASE (REF)
FWD
IDG AIR/OIL HEAT EXCHANGER VALVE OVERRIDE PRESSURE SWITCH, S1611
F
Generator Drive System - Component Location Figure 102 (Sheet 2)
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747-400 MAINTENANCE MANUAL
 GENERATOR DRIVE SYSTEM - MAINTENANCE PROCEDURES
_______________________________________________
 1.  General_______
 A.  This procedures contains two tasks.
 B.  The first task is the procedure to release the pressure from the
 integrated drive generator (IDG) oil system.

 (1)  
You must release pressure from the IDG oil system before you do maintenance on the system components.

 (2)  
Open the service access door, for the IDG, on the left core cowl panel.

 C.  
The second task is the procedure to do a static leak check of the IDG oil system.

 (1)  
It will be necessary to fill the IDG oil system frequently, if there is a leak in the system.

 (2)  
The static leak check applies compressed air or nitrogen to the IDG oil system through the IDG pressure fill fitting. Then you monitor the gas pressure to find out if the system has a leak.

 (3)  
Get access to the IDG oil system through the thrust reverser halves.

 TASK 24-11-00-862-001
 2.  Release the Pressure from the IDG Oil System____________________________________________
 A.  Standard Tools and Equipment
 (1)  
Adapter - Outlet, OMP2505-3, Ozone Metal Products, 101-32 101th Street, Ozone Park, Long Island, NY 11416

 (2)  
Hose - To connect to outlet adapter

 (3)  
Container - 5 U.S. gallon (20 liter) capacity, suitable to collect oil drainage from IDG

 B.  
References

 (1)  
AIPC 24-11-01, Fig. 1

 (2)  
AIPC 24-11-01, Fig. 2

 C.  
Access

 (1)  
Location Zone 412 Engine 1 - Main Gearbox Aft Face 7 o'clock 422 Engine 2 - Main Gearbox Aft Face 7 o'clock 432 Engine 3 - Main Gearbox Aft Face 7 o'clock 442 Engine 4 - Main Gearbox Aft face 7 o'clock

 (2)  
Access Panel
 417B IDG Service Pressure Relief Access Door
 427B IDG Service Pressure Relief Access Door
 437B IDG Service Pressure Relief Access Door
 447B IDG Service Pressure Relief Access Door

 D.  
Procedure

 S 012-002
 (1)  
Open the service access door, for the IDG, on the left core cowl panel.

 (2)
Remove the cover from the overflow drain coupling on the IDG.

 S 032-004
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 24-11-00
 ALL  ú ú 01 Page 201 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

SEE B
SEE A
OIL SUPPLY TO EXTERNAL OIL CIRCUIT  IDG (619)  GEARBOX MAIN  FWD  ECSEE (IDG) (G19) DRIVE GENERATOR INTEGRATED 
A 
OIL RETURN FROM EXTERNAL OIL CIRCUIT 
COUPLING PRESSURE FILL 
CONTAINER  OVERFLOW DRAIN COUPLING WITH TUBE 
B 
Figure 201 Integrated Drive Generator Depressurization 

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