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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 424-005
 (1)  Install the relay as follows:
 (a)  
Install the relay.

 (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 864-006
 (1)
Supply electrical power to the main ac buses (AMM 24-22-00/201).

 S 714-008

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

 S 864-007

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

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757 MAINTENANCE MANUAL
 INSTRUMENT BUS VOLTAGE SENSING UNIT (IBVSU) REMOVAL/INSTALLATION
________________________________________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task removes the instrument bus voltage sensing unit (referred to as the unit) from the airplane. The second task installs the unit on the airplane.
 TASK 24-51-08-024-001
 2.  Remove the Instrument Bus Voltage Sensing Unit (Fig. 401)
______________________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Electrical Power Control

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

 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).

 S 024-004

 (3)  
Remove the unit as follows:

 (a)  
Open the P6 panel.

 (b)  
Remove the electrical connector from the unit.

 (c)  
Remove the four screws which attach the unit to the P6 panel.

 (d)  
Remove the unit..

 TASK 24-51-08-424-005
 3.  Install the Instrument Bus Voltage Sensing Unit (Fig. 401)
_______________________________________________
 A.  References
 (1)  AMM 24-22-00/201, Electrical Power Control
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757
MAINTENANCE MANUAL

Instrument Bus Voltage Sensor Unit Installation
Figure 401

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757 MAINTENANCE MANUAL
 (2)  AMM 31-41-00/201, Engine Indicating Crew Alerting System
 B. Access
　
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