747-400 MAINTENANCE MANUAL
SEE A
SEE B
EXT 1 APU 1 APU 2 EXT 2
SSB ISLN BUS TIE
UTILITY
UTILITY UTILITY
UTILITY
GALLEY
GALLEY GALLEY
GALLEY BUS 1 BUS 2 BUS 3 BUS 4
GEN CONT OFF
TEMP/ PRESS DRIVE DRIVE
1 2 3 4
ELECTRICAL SYSTEM CONTROL MODULE ELECTRICAL SYSTEM SYNOPTIC DISPLAY
AB
Electrical System Control Module/Synoptic Display Location
Figure 501
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A 747-400 MAINTENANCE MANUAL
(5) S 715-011Do a test of the ELCUs: (a) Push the ELEC switch on the EICAS display panel to get access to the synoptic page for the electrical system. (b) Make sure the ELCUs 1, 2, 3, and 4 for the utility power indicate that they are closed. (c) Make sure the ELCUs 1, 2, 3, and 4 for the galley power indicate that they are closed.
(6) S 865-009Remove electrical power, if it is not necessary (Ref 24-22-00/201).
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747-400 MAINTENANCE MANUAL
AC ELECTRICAL LOAD DISTRIBUTION
_______________________________ CIRCUIT BREAKER - REMOVAL/INSTALLATION
______________________________________
1. General_______
A. This procedure has two tasks. One task is the removal of a typical circuit breaker located on an airplane panel. The other task is the installation of the circuit breaker.
B. The tasks have instructions for single and three-phase circuit breakers.
C. The circuit breaker panels are in these areas:
(1)
The flight compartment
(2)
The aft passenger cabin
(3)
The crew rest area
(4)
The electrical and electronics (E/E) compartment
(5)
The area between nose gear wheel well and the fuselage
(6)
The forward cargo compartment
(7)
The aft cargo compartment.
D.
If you remove a circuit breaker from the P7 panel, you must remove the lightplate first.
TASK 24-50-01-004-001
2. Circuit Breaker Removal (Fig. 401)_______________________
A. References
(1) AMM 24-22-00/201, Manual Control
THREE-PHASE CIRCUIT BREAKER SINGLE-PHASE CIRCUIT BREAKER
Circuit Breaker Installation
Figure 401
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747-400
MAINTENANCE MANUAL
(2)
WDM 24-51-11 thru WDM 24-51-73, WDM 24-53-21 thru WDM 24-53-62, WDM 24-54-07 thru WDM 24-54-86
(3)
SSM 24-51-01 thru SSM 24-51-08, SSM 24-53-01, SSM 24-53-02, SSM 24-54-01 thru SSM 24-54-07
B. Access
(1)
Location Zone 116 Area Between Nose Gear Well and Fuselage, RH 117 Electrical and Electronics Compartment, LH 118 Electrical and Electronics Compartment, RH 122 Forward Cargo Container Compartment Forward Half, RH 142 Aft Cargo Container Compartment, RH 221 Control Cabin, LH 222 Control Cabin, RH 271 Passenger Cabin, LH 273 Area Above Ceiling, LH
(2)
Access Panel
P6 Main Power Distribution Panel
P7 Overhead Circuit Breaker Panel
P54 Center Equipment Panel
P59 Aft Equipment Panel
P83 Panel
P84 Panel
P85 Panel
P86 Equipment Panel Lower Forward Cargo
P180 DC Power Distribution Panel
P183 E33 Equipment Center Panel
P414 Power Distribution Center - Left
P415 Power Distribution Center - Right
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