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____ removal, you can pull the circuit breakers according to the steps that follow. You only need to pull the circuit breakers applicable to the GCU you remove or install. This alternative method is applicable only for a GCU removal/installation. If you remove or install a BCU, you must remove all electrical power from the airplane.
 CAUTION: MAKE SURE THE ENGINE FOR THE RELATED GCU (ENGINE 1 FOR GCU
_______ 1, ENGINE 2 FOR GCU 2, ENGINE 3 FOR GCU 3, AND ENGINE 4 FOR GCU 4) IS NOT OPERATING. THE IDG SUPPLIES PERMANENT MAGNET GENERATOR (PMG) POWER TO THE GCU WHEN THE ENGINE OPERATES. IF YOU REMOVE THE GCU WHILE THE IDG SUPPLIES PMG POWER TO THE GCU, DAMAGE TO THE GCU MAY OCCUR.
 (a)  
If the engine related to the GCU you remove is operating, stop the engine.

 (b)  
Open these circuit breakers and attach the DO-NOT-CLOSE tags:

 NOTE: Open these circuit breakers when you remove GCU 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

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

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747-400 MAINTENANCE MANUAL
 b) B26, GCU 2 ALT 2) On the P614 panel: a) GCU 2 PHASE C SYNC BUS
 (d)  Open these circuit breakers and attach the DO-NOT-CLOSE tags:
 NOTE: Open these circuit breakers when you remove GCU 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
 (e)  Open these circuit breakers and attach the DO-NOT-CLOSE tags:
 NOTE: Open these circuit breakers when you remove GCU 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
 D.  Remove the Control Unit
 S 864-016
 (1)  
Make sure the BATTERY switch, on the P5 panel, is set to OFF and attach a DO-NOT-OPERATE tag.

 S 024-003

 (2)  
Remove the applicable GCU or BCU from the E/E rack (AMM 20-11-22/401).

 TASK 24-23-01-404-004
 3.  Generator and Bus Control Unit Installation (Fig. 401)
___________________________________________
 A.  References
 (1) AMM 20-11-22/401 Rack-Mounted Electrical/Electronic Module
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MAINTENANCE MANUAL

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 45-10-00/201, Central Maintenance Computer System

 (4)  
AIPC 24-23-01, Fig. 20

 (5)  
AIPC 24-23-01, Fig. 30

 (6)  
WDM 24-11-11 thru WDM 24-11-14, WDM 24-21-12, WDM 24-21-22, WDM 24-21-32, WDM 24-21-42, WDM 24-22-11 thru WDM 24-22-74, WDM 24-23-11 thru WDM 24-23-22, WDM 24-27-51 thru WDM 24-27-52, WDM 24-41-12 thru WDM 24-41-23

 (7)  
SSM 24-11-01 thru SSM 24-11-04, SSM 24-21-01 thru SSM 24-21-04, SSM 24-22-01 thru SSM 24-22-07, SSM 24-23-01 thru SSM 24-23-02, SSM 24-23-04, SSM 24-27-01 thru SSM 24-27-07, SSM 24-32-02, SSM 24-34-01 thru SSM 24-34-03, SSM 24-41-01 thru SSM 24-41-02

 B.
Access

 (1)  
Location Zone
 117 Electrical and Electronics Compartment, LH
 118 Electrical and Electronics Compartment, RH

 C.
Install the Generator Control Unit or the Bus Control Unit

 S 424-005
 (1)  
Install the applicable GCU or BCU in the E/E rack
 (AMM 20-11-22/401).

 S 864-017

 (2)  
Remove the DO-NOT-OPERATE tag from the BATTERY switch.
　
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