P0WER DISTRIBUTION PANEL P6
K107 CENTER BUS TRANSFER RELAY

Center Bus Transfer Relay Installation
Figure 401

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A

757
MAINTENANCE MANUAL

 (2)  AMM 24-22-00/201, Electrical Power - Control
 B. Access
 (1)  Location Zones
 211/212 Flight Compartment

 C. Procedure
 S 424-007
 (1)  
Install the relay in the P6 panel.

 S 414-008

 (2)  
Close the P6 panel.

 S 864-009

 (3)  
Remove the DO-NOT-CLOSE tags and close these P6 panel circuit breakers:

 (a)  
6D2, BAT XFR CONT

 (b)  
6L12, CENTER BUS DC

 D. Do a test of the relay installation
 S 864-010
 (1)
Supply electrical power to the main ac buses (AMM 24-22-00/201).

 S 724-011

 (2)  
DO the isolation test on the autoland bus within the MCDP test code 40 - Autoland System (AMM 22-41-00/501).

 (3)
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 864-012
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A
757 MAINTENANCE MANUAL
 CENTER BUS ISOLATION RELAY - REMOVAL/INSTALLATION
_________________________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task removes the center bus isolation relay (referred to as the relay) from the airplane. The second task installs the relay on the airplane.
 TASK 24-51-06-024-001
 2.  Remove the Center Bus Isolation Relay (Fig. 401)
_____________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Electrical Power - Control

 (2)  
AMM 27-61-00/201, Speedbrake/Spoiler Control System

 B.  Access
 (1)  Location Zones
 211/212 Flight Compartment

 C.  Prepare for the Removal
 S 044-002
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE SPOILERS OR MOVE ALL
_______ PERSONS AND EQUIPMENT AWAY FROM THE SPOILERS. THE SPOILERS CAN RETRACT QUICKLY AND CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  Do the deactivation procedure for the spoilers (AMM 27-61-00/201) or move all persons and equipment away from the spoilers.
 S 044-003
 WARNING: REMOVE THE ELECTRICAL POWER FROM THE AIRPLANE WHEN YOU REMOVE
_______ OR INSTALL COMPONENTS IN THE POWER PANELS. HIGH VOLTAGES CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  Remove electrical power (AMM 24-22-00/201).
 D.  Procedure
 S 024-004
 (1)  Remove the relay as follows:
 (a)  
Make sure the BAT switch on the pilot's overhead panel P5 is OFF. Attach a DO-NOT-OPERATE tag on the switch.

 (b)  
Open the P6 panel.

 (c)  
Remove the relay from the P6 panel.

 TASK 24-51-06-424-005
 3.  Install the Center Bus Isolation Relay (Fig. 401)
______________________________________
 A.  References
 (1)  
AMM 22-41-00/501, Maintenance Monitor

 (2)  
AMM 24-22-00/201, Electrical Power - Control

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