SUBTASK 24-21-00-010-002
(2) Do these steps to remove external power from the 115V AC transfer buses:
(a) Set the GRD PWR switch on the P5-4 panel to the OFF position.
(b) Make sure the GRD PWR AVAILABLE light on the P5-4 stays on.
(c) Make sure these lights on the P5-4 panel come on:
1) 1 SOURCE OFF
2) 2 SOURCE OFF
3) 1 TRANSFER BUS OFF
4) 2 TRANSFER BUS OFF
(d) Make sure the EXTERNAL POWER NOT IN USE light on the P19 panel comes on.
(e) Remove power from the external power cable.
(f) Make sure the EXTERNAL POWER CONN light on the P19 panel goes off.
WARNING
REMOVE ELECTRICAL POWER FROM THE EXTERNAL POWER
SOURCE. IF YOU DO NOT REMOVE ELECTRICAL POWER, YOU CAN
CAUSE INJURIES TO PERSONNEL AND DAMAGE TO EQUIPMENT.
(g) Remove the external power cable.
(h) Make sure the EXTERNAL POWER NOT IN USE light on the P19 panel goes off.
(i) Close the External Power Receptacle Door.
SUBTASK 24-21-00-480-001
WARNING
PUT A DO-NOT-OPERATE TAG ON THE EXTERNAL POWER RECEPTACLE.
IF YOU DO NOT OBEY THIS INSTRUCTION, INJURIES TO PERSONS CAN
OCCUR.
(3) Attach a DO NOT OPERATE tag, STD-858 to the external power receptacle.
F. AC Generation and Load System - Tryout
NOTE: This tryout is to make sure the AC Generation and Load system is in a zero energy state.
SUBTASK 24-21-00-211-001
(1) Make sure the External Power Plug is removed from the receptacle and a DO NOT OPERATE
tag, STD-858 is installed.
SUBTASK 24-21-00-010-003
(2) Open this access panel:
Number Name/Location
117A Electronic Equipment Access Door
SUBTASK 24-21-00-211-002
(3) Verify that the power warning lights are off on the power distribution panels (P91, P92)
END OF TASK
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
24-21-00
Page 202
D633A101-ILF Oct 15/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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