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24-22-01
ALL ú ú 04 Page 410 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
GENERATOR, BUS TIE, SPLIT SYSTEM, AND AUXILIARY POWER BREAKERS -
________________________________________________________________ REMOVAL/INSTALLATION
____________________
1. General_______
A. This section contains tasks for the removal and the installation of these breakers:
(1)
The four generator circuit breakers (GCB) C951, C952, C953, and C954
(2)
The four bus tie breakers (BTB) C957, C958, C959, and C960
(3)
The split system breaker (SSB) C961
(4)
The two auxiliary power breakers (APB) C955 and C956.
B.
An operational test of the breakers is included in the installation task.
C.
One GCB and one BTB is installed in each of the four generator power center panels (P514, P515, P614, and P615). Two APBs are installed in the auxiliary power center panel (P714) Two APBs are installed in the external power center panel (P715). The SSB is installed in the split system breaker panel (P92).
NOTE: All of these panels are found in the E/E compartment.
____
D. Get access to the E/E compartment through the door behind the nose wheel or through the forward cargo compartment.
TASK 24-22-02-004-001
2. Breaker Removal (Fig. 401)_______________
A. General
(1)
The removal task is almost the same for all the breakers. You get access to the breakers in different panels.
B.
References
(1)
24-22-00/201, Manual Control
(2)
IPC 24-22-02, 24-50-01
(3)
WDM 24-21-11 thru 24-21-71, 24-22-11 thru 24-22-41
(4)
SSM 24-21-01 thru 24-21-06, 24-22-01 thru 24-22-04
C.
Access
(1)
Location Zone 117 Electrical and Electronics Compartment, LH 118 Electrical and Electronics Compartment, RH
(2)
Access Panel
P92 Split System Breaker Panel
P514 Generator 1 Power Center - Left
P515 Generator 2 Power Center - Right
P614 Generator 3 Power Center - Left
P615 Generator 4 Power Center - Right
P714 Aux/Ext No. 1 Power Center
P715 Aux/Ext No. 2 Power Center
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400 MAINTENANCE MANUAL
SEE C
SEE E
GENERATOR CIRCUIT
BREAKER 1 (C951) BUS TIE
SEE F BREAKER 1 (C957)
SEE B SCREW SEE F
(4 PLACES)
SEE A SCREW
(4 PLACES)
SEE D
P514
P614
GENERATOR CIRCUIT BREAKER 2 (C952) SCREW
BUS TIE (4 PLACES) SCREW
BREAKER 2SEE F (4 PLACES)(C958)
SEE F
P514 AND P614 GENERATOR 1 AND 2 POWER CENTER-LEFT
A
BUS TIE BREAKER 3
SCREW (C959)
(4 PLACES)
GENERATOR CIRCUIT SEE F BREAKER 3 (C953)
SCREW
(4 PLACES) SEE F
P515
P615
SCREW BUS TIE
(4 PLACES) GENERATOR CIRCUIT BREAKER 4 (C960)
BREAKER 4 (C954)
SCREW SEE F (4 PLACES) SEE F
P515 AND P615 GENERATOR 3 AND 4 POWER CENTER-RIGHT
B
Generator, Bus Tie, Split System, and Auxiliary Power Breakers Installation Figure 401 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
