SPLIT SYSTEM BREAKER (C961)
SEE F
SCREW  SCREW
(4 LOCATIONS) (4 LOCATIONS) P92 SPLIT SYSTEM BREAKER PANEL C
AUXILIARY POWER AUXILIARY POWER BREAKER 1 (C955) BREAKER 2 (C956)
SEEF  SEEF
SCREW
(2 LOCATIONS)

COVER
NUT)
(6 LOCATIONS) LOCKWASHER P715 AUX/EXT
NO. 1 POWER CENTER P714 AUX/EXT
(6 LOCATIONS) NO. 2 POWER CENTER WASHER
D
(6 LOCATIONS) E
CIRCUIT BREAKER (EXAMPLE)
ELECTRICAL
CONNECTOR
RECEPTACLE

NOTE:  TERMINAL LEADS ARE NOT SHOWN.
F
Generator, Bus Tie, Split System, and Auxiliary Power Breakers Installation
Figure 401 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 D. Procedure
 S 864-024
 (1)
Make sure that the electrical power is off (Ref 24-22-00/201).

 S 864-002

 (2)  
Make sure the BATTERY switch, on panel P5, is OFF.

 (a)  
Make sure you attach a DO NOT OPERATE placard.

 S 014-004
 (3)  Open the applicable panel, in the table below, to get access to the breaker that you will remove.
 ~............................................ | Equipment Number | .............................................. | Circuit Breaker | Connector | Panel | .............................................. | C951 | DC951 | P514 | | C952 | DC952 | P614 | | C953 | DC953 | P515 | | C954 | DC954 | P615 | | C955 | DC955 | P714 | | C956 | DC956 | P715 | | C957 | DC957 | P514 | | C958 | DC958 | P614 | | C959 | DC959 | P515 | | C960 | DC960 | P615 | 2.................….............…............1
 S 034-005
 (4)  
Disconnect the control cable connector from the breaker.

 S 034-025

 (5)  
Disconnect the terminal leads from the breaker:

 (a)  
Remove the screws that attach the terminal covers to the breaker.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (b)  
Remove the six nuts and washers that attach the six terminal leads to the breaker.

 (c)  
Attach a label to identify each terminal lead.

 (d)  
Disconnect the leads from the terminal block.

 (e)  
Install the nuts and washers on the terminal block.

 (f)  
Tighten the nuts with your hand.

 (g)  
Install the terminal covers on the breaker.

 S 024-026
 (6)  
Remove the breaker:

 (a)  
Remove the four screws that attach the breaker to the panel.

 (b)  
Remove the breaker.

 TASK 24-22-02-404-012
 3. Breaker Installation (Fig. 401)
____________________
 A. General
 (1)  
The installation task is almost the same for all breakers. The operational tests are different and the breakers are found in different panels.

 B.
References

 (1)  
24-22-00/201, Manual Control

 (2)  
49-11-00/201, Auxiliary Power Unit

 (3)  
71-00-00/201, Power Plant

 (4)  
IPC 24-22-02, 24-50-01

 (5)  
WDM 24-21-11 thru 24-21-71, 24-22-11 thru 24-22-41

 (6)  
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