G. Load Shed Relay Installation Test
SUBTASK 24-51-11-710-001
(1) If the MAIN BUS 1 or MAIN BUS 2 load shed relay was replaced, test the relay per the steps
that follow:
(a) Do this task: Supply External Power, TASK 24-22-00-860-813.
(b) Reference the wiring diagram listed below to find an electrical load for the load shed relay
that was replaced:
NOTE: Choose a load that is easy to verify if power is being supplied or removed.
1) WDM 24-51-11
2) WDM 24-51-21
(c) Make sure that the applicable load is being supplied power.
(d) If the MAIN BUS 1 load shed relay was replaced in the P91 panel.
1) Open this circuit breaker and install safety tag:
Power Distribution Panel Number 1, P91
Row Col Number Name
C 7 C01288 GEN 1 LOAD SHED
(e) If the MAIN BUS 2 load shed relay was replaced in the P92 panel.
1) Open this circuit breaker and install safety tag:
Power Distribution Panel Number 2, P92
Row Col Number Name
C 7 C01289 GEN 2 LOAD SHED
(f) Make sure that power is removed from the applicable load.
1) Remove the safety tag and close this circuit breaker:
Power Distribution Panel Number 1, P91
Row Col Number Name
C 7 C01288 GEN 1 LOAD SHED
2) Remove the safety tag and close this circuit breaker:
Power Distribution Panel Number 2, P92
Row Col Number Name
C 7 C01289 GEN 2 LOAD SHED
SUBTASK 24-51-11-710-002
(2) If a GALLEY BUS load shed relay was replaced, test the relay per the steps that follow:
(a) Do this task: Supply External Power, TASK 24-22-00-860-813.
(b) Set the GALLEY switch on the P5-13 panel to the ON position.
NOTE: On some airplanes, the switch name is CAB/UTIL.
(c) Make sure that the applicable galley is being supplied power.
NOTE: There may be a power switch on the galley module that needs to be set to the
ON position also.
(d) Set the GALLEY switch on the P5-13 panel to the OFF position.
NOTE: On some airplanes, the switch name is CAB/UTIL.
(e) Make sure that power is removed from the applicable galley.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
24-51-11
Page 419
D633A101-ILF Jun 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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