OPERATIONS MANUAL

Auxiliary Power
APU Control:
Battery switch
ON Enables APU operation.
Connects the main battery
and the APU battery with the
respective battery busses.
APU selector
OFF Closes the APU bleed air isolation
valve (if not closed by other
means) and disconnects both APU
generators. Starts the automatic
APU shutdown program. After
automatic fault shutdown, erases
related EICAS messages unless the
fault is an APU bleed duct leak.
ON Opens the APU air inlet door
and the APU fuel valve for APU
operation. Arms the APU bleed air
isolation valve control. Activates an
AC fuel pump system if AC power
is available, otherwise a DC fuel
pump.
START (spring loaded to ON position;
hold for 2 seconds) Activates the
automatic APU start program.
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