P0WER DISTRIBUTION PANEL P6
K123 CENTER BUS ISOLATION RELAY

Center Bus Isolation Relay Installation
Figure 401

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757
MAINTENANCE MANUAL

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

 C. Procedure
 S 424-006
 (1)  Install the relay as follows:
 (a)  
Install the relay in the P6 panel.

 (b)  
Close the P6 panel.

 (c)  
Remove the DO-NOT-OPERATE tag from the BAT switch on the P5 panel.

 D. Do a test of the relay installation
 S 864-007
 (1)
Supply electrical power to the main ac buses (AMM 24-22-00/201).

 S 724-008

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

 S 864-009

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

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 ISOLATION REQUEST RELAY - REMOVAL/INSTALLATION
______________________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task removes the isolation request relay from the airplane. The second task installs the isolation request relay on the airplane.
 TASK 24-51-07-024-001
 2.  Remove the Isolation Request 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 864-009
 WARNING: REMOVE THE ELECTRICAL POWER FROM THE AIRPLANE WHEN YOU REMOVE
_______ OR INSTALL COMPONENTS IN THE POWER CENTERS. 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 in the OFF position. Attach a DO-NOT-OPERATE tag on the switch.

 (b)  
Open the P6 Panel.

 (c)  
Remove the relay.

 TASK 24-51-07-424-003
 3.  Install the Isolation Request Relay (Fig. 401)
___________________________________
 A.  References
 (1)  AMM 22-41-00/501, Maintenance Monitor
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757
MAINTENANCE MANUAL

P0WER DISTRIBUTION PANEL P6
K122 ISOLATION REQUEST RELAY

Isolation Request Relay Installation
Figure 401

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