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A
747-400 MAINTENANCE MANUAL
 D. Procedure
 S 865-002
 (1)  
Make sure all electrical power is off (AMM 24-22-00/201).

 S 865-003

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

 S 715-017

 (3)  
Do a check for the ELEC BCU EICAS messages.

 (a)  
Push the STAT button on the EICAS display panel.

 (b)  
Make sure these status EICAS messages do not show on the EICAS screen: 1) ELEC BCU 1 2) ELEC BCU 2 3) ELEC GEN SYS 1 4) ELEC GEN SYS 2 5) ELEC GEN SYS 3 6) ELEC GEN SYS 4

 (c)  
If you see the status EICAS message(s), do the applicable trouble shooting (Ref FIM 24-Fault Code Index).

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747-400 MAINTENANCE MANUAL
 GENERATOR CONTROL CURRENT TRANSFORMER - REMOVAL/INSTALLATION
____________________________________________________________
 1.  General_______
 A.  This procedure has two tasks. One task is the removal of the generator control current transformers (T4004, T4005, T4006, and T4007). The other task is the installation of the transformers.
 B.  The transformers are installed in the four generator power center panels P514, P515, P614, and P615. The panels are 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 24-23-03-004-001
 2.  Generator Control Current Transformer Removal (Fig. 401)_____________________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AIPC 24-23-03-01, AIPC 24-23-03-02, AIPC 24-23-03-03, AIPC 24-23-03-04

 (3)  
WDM 24-21-12, WDM 24-21-22, WDM 24-21-32, WDM 24-21-42

 (4)  
SSM 24-21-01, SSM 24-21-02, SSM 24-21-03, SSM 24-21-04

 B.  
Access

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

 (2)  
Access Panel
 P514 Generator 1 Power Center - Left
 P614 Generator 2 Power Center - Left
 P515 Generator 3 Power Center - Right
 P615 Generator 4 Power Center - Right

 C.  
Procedure

 S 864-002
 (1)  
Make sure all electrical power is off (AMM 24-22-00/201).

 S 014-015

 (2)  
Open the applicable panel to get access to the transformer. ~....................................... | Equipment Number | ......................................... | Unit | Connector | Panel | ......................................... | T4004 | DT4004 | P514 | | T4005 | DT4005 | P614 | | T4006 | DT4006 | P515 | | T4007 | DT4007 | P615 | 2............….............…............1

 (3)  
Disconnect the electrical connector from the transformer.

 S 024-016
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747-400
MAINTENANCE MANUAL

GENERATOR 1 CONTROL CURRENT TRANSFORMER, T4004
SEE C
SEE B
SEE A P514
P614
GENERATOR 2 CONTROL CURRENT TRANSFORMER, T4005
SEE C
P514 AND P614 GENERATOR 1 AND 2 POWER CENTER - LEFT
GENERATOR 3 CONTROL  A
CURRENT TRANSFORMER, T4006
SEE C
P515
P615
GENERATOR 4 CONTROL CURRENT TRANSFORMER, T4007
SEE C
P515 AND P615 GENERATOR
3 AND 4 POWER CENTER - RIGHT

GENERATOR CONT CURRENT TRANSFORMER (EXAMPLE)
B
C
Generator Control Current Transformer Installation
Figure 401

A44730
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