737 Flight Crew Operations Manual
Electrical -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
6.10.8 D6-27370-866-EGP
8 APU Generator Off Bus (GEN OFF BUS) Light
Illuminated (blue) – APU is running and not powering a bus.
9 APU Generator (GEN) Switches
Three position switch, spring–loaded to neutral.
OFF –
• APU generator powering both AC transfer busses
• moving a single APU GEN switch to OFF illuminates related
SOURCE OFF light. APU continues to power AC transfer busses
• subsequently moving other APU GEN switch to OFF disconnects
APU generator from tie bus and removes APU power from AC
transfer busses
• APU generator powering one AC transfer bus; IDG powering one AC
transfer bus
• moving related APU GEN switch to OFF disconnects APU generator
from tie bus and AC transfer bus. IDG powers AC transfer busses.
ON –
• Neither AC transfer bus powered by IDG – moving a single APU GEN
switch to ON:
• connects both AC transfer busses to the APU generator
• disconnects external power, if connected
• opposite SOURCE OFF light illuminates until the other APU GEN
switch is moved to ON.
• Both AC transfer busses powered by IDGs – moving an APU GEN
switch ON:
• powers the related AC transfer bus from the APU generator
• other AC transfer bus continues to receive power from the IDG.
Ground Service Switch
September 24, 2015
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