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A
747-400 MAINTENANCE MANUAL
 S 864-014
 (10) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
 AUXILIARY GENERATOR CONTROL UNIT - REMOVAL/INSTALLATION
_______________________________________________________
 1.  General_______
 A.  This procedure has two tasks. One task is the removal of the auxiliary generator-control unit (AGCU) (G26 and G27). The other task is the installation of the unit.
 B.  The installation task includes an operational test of the units.
 C.  The AGCUs are installed on the top shelf of the E/E rack in the E/E compartment. Access to the E/E compartment is through the door behind the nose wheel or through the forward cargo compartment.
 TASK 24-23-05-004-001
 2.  Auxiliary Generator Control Unit Removal (Fig. 401)________________________________________
 A.  References
 (1)  
20-11-22/401, Rack-Mounted Electrical/Electronic Module

 (2)  
IPC 24-23-01 Fig. 10

 (3)  
WDM 24-21-51, 24-21-52, 24-21-61, 24-21-62, 24-22-31, 24-22-32

 (4)  
SSM 24-21-05, 24-21-06, 24-22-03

 B.  
Access

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

 C.  
Procedure

 S 864-002
 (1)  
Make sure the APU switch, on the P5 panel, is set to OFF and install a DO-NOT-OPERATE tag.

 S 864-003

 (2)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P180 DC Power Distribution Panel
 1) 180B12 AGCU 1
 2) 180B13 AGCU 2

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A

747-400
MAINTENANCE MANUAL

SEEA
AGCU NO. 2 (G27) SEE B
AGCU NO. 1 (G26) SEE B
ELECTRICAL AND ELECTRONICS RACK 
A 
AGCU 
(TYPICAL) 

B
Auxiliary Generator Control Unit (AGCU) Installation Figure 401
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 24-23-05
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747-400 MAINTENANCE MANUAL
 S 024-004
 (3) Remove the applicable AGCU from the E/E rack (Ref 20-11-22/401).
 TASK 24-23-05-404-005
 3.  Auxiliary Generator Control Unit Installation (Fig. 401)_____________________________________________
 A. References
 (1)  
20-11-22/401 Rack-Mounted Electrical/Electronic Module

 (2)  
24-22-00/201, Manual Control

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

 (4)  
IPC 24-23-01 Fig. 10

 (5)  
WDM 24-21-51, 24-21-52, 24-21-61, 24-21-62, 24-22-31, 24-22-32

 (6)  
SSM 24-21-05, 24-21-06, 24-22-03

 B.
Access

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

 C.
Install the Auxiliary Generator Control Unit

 S 424-006
 (1)
Install the applicable AGCU in the E/E rack (Ref 20-11-22/401).

 S 864-007

 (2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
　
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