CREW CONTROLS AND INDICATORS
Auxiliary Power Unit (APU) Control Box
FUEL SHUT-OFF Switch
This two-position toggle switch controls
electrical power to the APU fuel solenoid
and APU fuel pumps.
When the toggle switch and vehicle
MASTER switch are ON, fuel is supplied
for operation of the APU. When the
switch is positioned to OFF, fuel supply is
The switch should always be turned OFF
when APU is shut down.
Positioning this switch lever to MOMentary-
ON turns on the preheating units in the
APU combustion chamber, and supplies
power to the START switch.
When the switch lever is released, the
switch returns to OFF position, the pre-
heating units turn off, and electrical conti-
nuity to the START switch is broken.
APU GEN Switch
This two-position toggle switch turns APU
generator ON and OFF.
Switch must be OFF when starting the APU.