S 794-074

 (29)
 Do this task:  Test No. 3 - Ground Test - Idle Leak Test (AMM 71-00-00/501).

 S 414-045
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 24-11-14
 ALL  ú ú 01P Page 421 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 IDG AIR/OIL HEAT EXCHANGER VALVE - REMOVAL/INSTALLATION
_______________________________________________________
 1.  General_______
 A.  This procedure contains two tasks:
 (1)
The IDG Air/Oil Heat Exchanger Valve (valve) Removal.

 (2)
The Valve Installation.

 B.  
The installation task includes an operational test of the valve. A high-power engine operation is necessary to do the test. You can do the test immediately after you install the valve or you can do the test during the first usual engine operation.

 C.  
You must remove and install the valve and the IDG air/oil heat exchanger (referred to as the heat exchanger) as an assembly (Ref 24-11-14/401). After you remove the assembly, you can disassemble the valve from the heat exchanger.

 D.  
The heat exchanger and the valve are installed on the engine intermediate case at the 4 o'clock position.

 E.  
Open the right thrust reverser half to get access to the valve.

 TASK 24-11-15-004-001
 2.  IDG Air/Oil Heat Exchanger Valve Removal (Fig. 401)________________________________________
 A.  References
 (1)
24-11-14/401, IDG Air/Oil Heat Exchanger

 (2)
IPC 24-11-01 Fig. 1

 (3)
IPC 24-11-14 Fig. 1

 (4)
IPC 24-11-51 Fig. 1

 (5)
IPC 71-71-01 Fig. 1

 (6)
IPC 75-32-00 Fig. 5

 (7)
WDM 24-11-11, 24-11-12, 24-11-13, 24-11-14

 (8)
SSM 24-11-01, 24-11-02, 24-11-03, 24-11-04

 B.  
Access

 (1)  
Location Zone
 412 Engine 1 - Intermediate Case 4 o'clock
 422 Engine 2 - Intermediate Case 4 o'clock
 432 Engine 3 - Intermediate Case 4 o'clock
 442 Engine 4 - Intermediate Case 4 o'clock

 (2)  
Access Panel
 416 Right Thrust Reverser Half - Engine 1
 426 Right Thrust Reverser Half - Engine 2
 436 Right Thrust Reverser Half - Engine 3
 446 Right Thrust Reverser Half - Engine 4

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 24-11-15
 ALL  ú ú 01P Page 401 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

INTERMEDIATE CASE
SEE A
FWD BSEE 
A 
PORT OIL-OUT HEAT EXCHANGER IDG AIR/OIL CONNECTOR ELECTRICAL  VALVE, V350 HEAT EXCHANGER IDG AIR/OIL 
B 
IDG Air/Oil Heat Exchanger Valve Installation Figure 401 PORT OIL-IN 

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 24-11-15
 ALL  ú ú 01P Page 402 ú Oct 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 C. Procedure
 S 034-002
 (1)  
Remove the heat exchanger (Ref 24-11-14/401).

 S 024-018

 (2)  
Disconnect the valve from the heat exchanger (Ref 24-11-14/401).

 TASK 24-11-15-404-003
 3.  IDG Air/Oil Heat Exchanger Valve Installation (Fig. 401)_____________________________________________
 A. References
 (1)  
24-11-14/401, IDG Air/Oil Heat Exchanger

 (2)  
24-22-00/201, Manual Control

 (3)  
71-00-00/201, Power Plant

 (4)  
IPC 24-11-01 Fig. 1

 (5)  
　
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