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24-11-01
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A
747-400 MAINTENANCE MANUAL
SEE A
ELECTRICAL SYSTEM CONTROL MODULE A
SEE B
MAIN GEARBOX INTEGRATED DRIVE GENERATOR
FWD IDG RESET RING
B
Electrical System Control/IDG Reset Ring Location Figure 201
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747-400 MAINTENANCE MANUAL
(b)
Make sure the OFF lights on the GEN CONT switches are on.
(c)
Make sure the DRIVE lights on the DRIVE DISC 1, 2, 3, and 4 switches, on the P5 panel, are on.
S 862-019
(3) Start the applicable engine(s) (AMM 71-00-00/201).
S 212-005
CAUTION: THE "DRIVE" LIGHT IN THE DRIVE DISC SWITCH MUST GO OFF AFTER
_______ YOU START THE ENGINE. IF THE "DRIVE" LIGHT STAYS ON, PUSH THE DRIVE DISC SWITCH TO REMOVE INPUT POWER TO THE IDG. HIGH OIL TEMPERATURE OR LOW OIL PRESSURE CAN CAUSE DAMAGE TO THE IDG.
(4) Make sure the DRIVE light on the applicable DRIVE DISC switch goes out when the engine gets near minimum idle.
S 862-007
CAUTION: DO NOT PUSH THE DRIVE DISC WHEN THE ENGINE RPM IS LESS THAN THE
_______ MINIMUM IDLE. IT IS POSSIBLE THAT THE IDG WILL NOT DISCONNECT FULLY. THIS CAN CAUSE DAMAGE TO THE IDG.
DO NOT PUSH THE DRIVE DISC SWITCH FOR LONGER THAN THREE SECONDS. DAMAGE TO THE DISCONNECT SOLENOID CAN OCCUR.
IF THE IDG DOES NOT DISCONNECT, LET 60 SECONDS ELAPSE BEFORE YOU PUSH THE DRIVE DISC SWITCH AGAIN. IF YOU DO NOT, DAMAGE TO THE DISCONNECT SOLENOID CAN OCCUR.
(5)
Disconnect the IDG.
(a)
Open the switch guard on the applicable DRIVE DISC switch.
(b)
Push the DRIVE DISC switch.
S 212-016
(6)
Make sure the IDG is disconnected.
(a)
Make sure the DRIVE light on the applicable DRIVE DISC switch comes on.
(b)
Make sure the applicable advisory EICAS message shows on the main EICAS screen: 1) DRIVE DISC 1 2) DRIVE DISC 2 3) DRIVE DISC 3 4) DRIVE DISC 4
S 862-010
(7)
Stop the engine(s) (AMM 71-00-00/201).
S 862-020
(8)
Remove electrical power, if it is not necessary (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
TASK 24-11-01-752-022
3. Connect Integrated Drive Generator (Fig. 201)
__________________________________
A. References
(1)
AMM 78-31-00/201, Thrust Reverser System
(2)
WDM 24-11-11 thru WDM 24-11-14
(3)
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 012-011
(1) Open the left thrust reverser half (AMM 78-31-00/201).
S 862-013
CAUTION: MAKE SURE THE N1 AND N2 ROTORS STOP BEFORE YOU PULL THE IDG
_______
RESET RING. DAMAGE TO THE IDG CAN OCCUR.
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