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747-400 MAINTENANCE MANUAL
C. Procedure
S 864-002
(1)
Make sure all electrical power is off (AMM 24-22-00/201).
S 034-003
(2)
If the circuit breaker is on the P7 circuit breaker panel, remove the lightplates:
(a)
Remove the two screws that attach the lightplate to the P7 panel.
NOTE: If you remove more than one lightplate, attach an
____ identification tag to each lightplate.
S 014-004
(3)
Open the access door for the applicable panel.
S 034-018
(4)
Disconnect the electrical leads from the circuit breaker:
(a)
Attach an identification tag to each electrical lead.
(b)
Remove the screws that attach the electrical leads to the circuit breaker.
(c)
Remove the electrical leads from the circuit breaker.
S 024-019
(5)
Remove the circuit breaker:
(a)
If the circuit breaker is connected to a bus bar, do these steps: 1) Remove the screws that attach the bus bar to the circuit
breakers. 2) Disconnect the bus bar from the circuit breakers.
(b)
Remove the nut that attaches the circuit breaker to the panel.
NOTE: Use a socket wrench to prevent scratches on the panel.
____
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747-400 MAINTENANCE MANUAL
(c) Remove the circuit breaker from the panel.
TASK 24-50-01-404-010
3. Circuit Breaker Installation (Fig. 401)____________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(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
P514 Generator 1 Power Center - Left
P515 Generator 3 Power Center - Right
P614 Generator 2 Power Center - Left
P615 Generator 4 Power Center - Right
P714 Aux/Ext No. 1 Power Center
P715 Aux/Ext No. 2 Power Center
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747-400 MAINTENANCE MANUAL
C. Procedure
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