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 BELOW MINIMUM IDLE SPEED.  THE IDG CAN BE DAMAGED IF IT DOES
 NOT DISENGAGE CORRECTLY.
 DO NOT PUSH THE IDG DISCONNECT SWITCH FOR MORE THAN 3 SECONDS.
 THE DISCONNECT SOLENOID CAN BE DAMAGED BY HEAT.
 IF THE IDG DOES NOT DISENGAGE, STOP FOR 60 SECONDS BEFORE YOU
 PUSH THE IDG DISCONNECT SWITCH AGAIN.  THE DISCONNECT SOLENIOD

 CAN BE DAMAGED BY HEAT.
 (2)  
Open the switch guard for the applicable DRIVE DISC 1, 2, 3, or 4 switch and push the switch.

 S 715-025

 (3)  
Make sure that the applicable DRIVE light on the DRIVE DISC switch is on.

 S 865-026

 (4)  
Make sure that the EICAS screen for the applicable IDG shows:

 (a)  
zero AC-V

 (b)  
FREQ of zero Hz

 (c)  
LOAD is 0.00

 S 865-027
 (5)  
Stop the engine (Ref 71-00-00/201).

 S 015-028

 (6)  
Open the left thrust reverser half (AMM 78-31-00/201).

 S 795-057

 (7)  
Check the IDG and the external cooling circuit for oil leaks.

 S 985-030
 CAUTION: MAKE SURE THAT THE N1 AND N2 ROTORS STOP BEFORE YOU TRY TO SET
_______ THE IDG CLUTCH. MOVEMENT CAN CAUSE DAMAGE TO THE IDG.
 (8)  
To set the IDG disconnect clutch, pull the reset ring out until you feel or hear a click from the IDG.

 S 415-032

 (9)  
Close the left thrust reverser half (AMM 78-31-00/201).

 (10)
 Erase the EICAS message "DRIVE DISC X" (AMM 45-10-00/001).

 S 865-045
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 24-11-00
 ALL  ú ú 02 Page 507 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 G.  Put the Airplane Back to the Usual Condition S 865-035
 (1) Remove electrical power, if it is not necessary (AMM 24-22-00/201).
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 24-11-00
 ALL  ú ú 03 Page 508 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 INTEGRATED DRIVE GENERATOR - MAINTENANCE PRACTICES
__________________________________________________
 1.  General_______
 A. This procedure has these tasks:
 (1)  
Disconnect the input drive shaft of the IDG from the main gearbox. The engine must be running to disconnect the IDG from the main gearbox.

 (2)  
Connect the drive shaft to the main gearbox.

 (3)  
Flush the IDG external oil cooling circuit.

 (4)  
IDG oil leak check procedure.

 NOTE: This procedure is used for large oil leaks.
____
 B. The engine must operate to disconnect the drive shaft.
 TASK 24-11-01-752-001
 2.  Disconnect Integrated Drive Generator (Fig. 201)_____________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 71-00-00/201, Power Plant

 (3)  
AMM 78-31-00/201, Thrust Reverser System

 (4)  
WDM 24-11-11 thru WDM 24-11-14

 (5)  
SSM 24-11-01 thru SSM 24-11-04

 B.
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 221 Control Cabin, LH

 (2)  
Access Panel
 415 Left Thrust Reverser Half - Engine 1
 425 Left Thrust Reverser Half - Engine 2
 435 Left Thrust Reverser Half - Engine 3
 445 Left Thrust Reverser Half - Engine 4

 C.
Procedure

 S 862-002
 (1)  
Supply external electrical power or APU electrical power (AMM 24-22-00/201).

 S 212-015

 (2)  
Examine these flight compartment switches:

 (a)  
　
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