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 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 864-003
 WARNING: REMOVE ELECTRICAL POWER FROM THE AIRPLANE WHEN YOU REMOVE OR
_______ INSTALL COMPONENTS IN THE POWER PANELS. HIGH VOLTAGES CAN CAUSE INJURY TO PERSONS OR DAMAGE EQUIPMENT.
 (2)  Remove electrical power (AMM 24-22-00/201).
 D.  Procedure
 S 024-004
 (1)  Remove the relay as follows:
 (a)  
Open the applicable electrical equipment panel.

 (b)  
Identify the wires that are necessary for the installation.

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A-A
Utility Bus Relays Installation Figure 401
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 (c)  
Remove the wires from the relay.

 (d)  
Remove the screws that attach the relay to the panel.

 (e)  
Remove the relay.

 TASK 24-51-02-404-005
 3.  Install the Utility Bus Relay (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
 119/120 Main Equipment Center

 (2)  
Access Panel
 119AL Main Equipment Center

 C. Procedure
 S 424-006
 (1)  Install the relay as follows:
 (a)  
Attach the relay to the panel with the installation screws.

 (b)  
Connect the wires to the relay.

 (c)  
Close the applicable electrical equipment 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 864-008

 (2)  
Make sure the applicable circuit breaker on the overhead circuit breaker panel P11 is closed.

 (a)  
11R4, UTIL BUS L or UTIL BUS LEFT

 (b)  
11R31, UTIL BUS R or UTIL BUS RIGHT

 S 864-010
 (3)  
Push the applicable UTILITY BUS switch on the pilots' overhead panel P5 to the ON position.

 (4)  
Make sure the yellow OFF light is off.

 S 714-011
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 (5)  S 864-012Push the UTILITY BUS switch to the OFF position.
 (6)  S 714-013Make sure the yellow OFF light is on.
 (7)  S 864-014Remove electrical power if it is not necessary (AMM 24-22-00/201).

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