(6)  
IPC 24-11-51 Fig. 1

 (7)  
IPC 71-71-01 Fig. 1

 (8)  
IPC 75-32-00 Fig. 5

 (9)  
WDM 24-11-11, 24-11-12, 24-11-13, 24-11-14

 (10)
 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

 C.
Procedure:

 S 434-017
 (1)  
Install the heat exchanger valve on the heat exchanger (Ref 24-11-14/401).

 (2)  
Install the heat exchanger (Ref 24-11-14/401).

 S 724-019

 (3)  
Do a Test of the IDG Air/Oil Heat Exchanger Valve:

 (a)  
Supply electrical power (Ref 24-22-00/201).

 S 424-004
 NOTE:  Perform this test if the IDG Air/Oil Heat Exchanger Valve was not tested before installation.
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747-400 MAINTENANCE MANUAL
 (b)  
Make sure that the applicable engine is stopped.

 (c)  
Get access to the INPUT MONITORING page on the CMCS.

 (d)  
Use the CDU keyboard to write the PORT LBL SDI word as follows: 1) For engine 1 and 2, write "E/086/271/00". 2) For engine 3 and 4, write "E/008/271/00".

 (e)  
Push the 1L key to start the CMCS sequence.

 (f)  
Make sure that the bit for the applicable engine is 1.

 NOTE: Engine 1 is bit 20 (top line - 4th from the right)
____ Engine 2 is bit 21 (top line - 5th from the right) Engine 3 is bit 22 (top line - 6th from the right) Engine 4 is bit 23 (top line - 7th from the right)
 (g)  
Start the applicable engine (Ref 71-00-00/201).

 (h)  
With the applicable engine at idle speed, make sure that the engine bit is 1.

 (i)  
Increase the engine speed to 90% N2.

 (j)  
Make sure that the bit changes to a 0 and remains 0 at 80 - 90% N2.

 (k)  
Stop the engine (Ref 71-00-00/201).

 (4)  
Remove electrical power, if it is not necessary (Ref 24-22-00/201).

 S 864-016
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747-400 MAINTENANCE MANUAL
 IDG AIR/OIL HEAT EXCHANGER VALVE OVERRIDE PRESSURE SWITCH -
___________________________________________________________ REMOVAL/INSTALLATION
____________________
 1.  General_______
 A.  This procedure has two tasks. One task is the removal of the override pressure switch (S1611) for the IDG air/oil heat exchanger valve. The other task is the installation of the pressure switch.
 B.  The pressure switch is installed on the intermediate case of each engine at the 1 o'clock position.
 C.  You must open the right thrust reverser half to get access to the pressure switch.
 TASK 24-11-16-004-001
 2.  IDG Air/Oil Heat Exchanger Valve Override Pressure Switch Removal (Fig. 401)_________________________________________________________________
 A.  References
 (1)
72-34-03/401, Fan Exit Liner Segment

 (2)
78-31-00/201, Thrust Reverser System

 (3)
AIPC 71-00-01-426, AIPC 71-00-01-451

 (4)
WDM 24-11-11, WDM 24-11-12, WDM 24-11-13, WDM 24-11-14

 (5)
SSM 24-11-01, SSM 24-11-02, SSM 24-11-03, SSM 24-11-04

 B.  
Access

 (1)  
Location Zone
 412 Engine 1 - Intermediate Case 1 o'clock
　
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