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MAINTENANCE MANUAL

INTERNAL THREAD FORM AND DIRECTION

Spiralock Nut
Figure 402

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MAINTENANCE MANUAL

 (2)
AIPC 24-11-01, Fig. 2

 (3)
AIPC 24-11-01, Fig. 11

 (4)
AIPC 71-71-01, Fig. 1

 (5)
AMM 24-11-00/201, Generator Drive System

 (6)
AMM 24-22-00/201, Manual Control

 (7)
AMM 78-31-00/201, Thrust Reverser System

 (8)
WDM 24-11-11, WDM 24-11-12, WDM 24-11-13, WDM 24-11-14

 (9)
SSM 24-11-01, SSM 24-11-02, SSM 24-11-03, SSM 24-11-04

 (10)
 SWPM 20-10-14

 D.  Access
 (1)  
Location Zone
 412 Engine 1 - Main Gearbox Aft Face 6 o'clock
 422 Engine 2 - Main Gearbox Aft Face 6 o'clock
 432 Engine 3 - Main Gearbox Aft Face 6 o'clock
 442 Engine 4 - Main Gearbox Aft Face 6 o'clock

 (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

 E.  Procedure
 S 864-063
 (1)
Put the appropriate BUS TIE switch, on the P5 panel, to ISLN.

 S 944-064

 (2)
Remove electrical power (AMM 24-22-00/201).

 NOTE: If you want to keep airplane power available during a IDG
____ removal, you can pull the circuit breakers according to the steps that follow. You only need to pull the circuit breakers applicable to the IDG you remove or install.
 (a) Open these circuit breakers and attach the DO-NOT-CLOSE tags:
 NOTE: Open these circuit breakers when you remove IDG 1.
____
 1)  On the P180 or P180-1 panel:
 a) C8 or M4, GCU 1
 b) B25, GCU 1 ALT

 2)  On the P514 panel:
 a) GCU 1 PHASE C SYNCH BUS

 (b) Open these circuit breakers and attach the DO-NOT-CLOSE tags:
 NOTE: Open these circuit breakers when you remove IDG 2.
____
 1)  On the P180 or P180-1 panel:
 a) C9 or M5, GCU 2
 b) B26, GCU 2 ALT

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747-400 MAINTENANCE MANUAL
 2)  On the P614 panel:
 a) GCU 2 PHASE C SYNC BUS

 (c) Open these circuit breakers and attach the DO-NOT-CLOSE tags:
 NOTE: Open these circuit breakers when you remove IDG 3.
____
 1)  On the P180 or P180-1 panel:
 a) C10 or M6, GCU 3
 b) B27, GCU 3 ALT

 2)  On the P515 panel:
 a) GCU 3 PHASE C SYNC BUS

 (d) Open these circuit breakers and attach the DO-NOT-CLOSE tags:
 NOTE: Open these circuit breakers when you remove IDG 4.
____
 1)  On the P180 or P180-1 panel:
 a) C11 or M7, GCU 4
 b) B28, GCU 4 ALT

 2)  On the P615 panel:
 a) GCU 4 PHASE C SYNCH BUS

 S 014-003
 (3)  
Open the left thrust reverser half (AMM 78-31-00/201).

 S 864-004

 (4)  
Release the pressure from the IDG oil system (AMM 24-11-00/201).

 S 684-005

 (5)  
Drain the oil from the IDG:

 (a)  
Remove the cap (cover) (38) from the overflow drain
 coupling (37) on the IDG (1).

 (b)  
Put the free end of the outlet hose into a container.

 WARNING: BE CAREFUL WHEN YOU CONNECT THE OUTLET ADAPTER TO THE
_______ OVERFLOW DRAIN COUPLING. USE A RAG AROUND THE FITTING TO PREVENT A SPRAY CAUSED BY PRESSURE IN THE IDG CASE. HOT OIL CAN CAUSE INJURIES.
　
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