APU Flashcards
The APU is a source of _______ and ________ power on the ground or in flight
Bleed Air
Electrical
The EMB-135BJ is equipped with a Sundstandar ___________ APU.
T-62T-40C14
Control of the C14 is performed by a ____________
FADEC
Fuel Supply for the APU normally comes from the _____ wing
Right
The APU is located in the tailcone of the aircraft and isolated by a _________ firewall
Titanimum
The APU FADEC control receives electrical power from the __________ DC bus.
Essential
Overspeed or underspeed is specified as ___________ faults that will result in immediate ____________ of the APU on the ground or in flight.
Critical
Shutdown
The Max EGT for APU start _______ ºC, and _______ ºC for steady state operations which can be exceeded up to a temperature of _________ ºC for 3 minutes or ________ ºC for 5 minutes
884
680
732
717
The APU starter-generator is rated at ______ amps below ___________ feet and _______ amps above __________ feet. The starter-generator operates in __________ with the aircraft battery and/or with the main engine generators during all phases of flight.
400
30,000
300
30,000
Parallel
The APU Fuel Shutoff guarded overhead button shuts off fuel to the APU via the APU fuel line _______________
Shutoff Valve
The APU fire extinguishing button closes the ______________ valve and discharges the APU ___________
APU Shutoff
Fire Bottle
Turning the APU Master knob on energizes the __________ and commands the ____________ valve to open
FADEC
APU Main Fuel
The pneumatic system gives priority to _______ bleed air over _______ bleed air.
Engine
APU
When the APU generator is operative, it is normally connected in ___________ to the ____________
2 Main
Parallel
Pressing the APU _______ button is the normal method of shutting down the APU.
Stop
The APU Master knob should not be moved to the off position until the APR RPM has dropped below ______ %
10
The maximum altitude for APU starting is ___________ feet.
30,000
The maximum altitude for APU Operation is ____________ feet, If extracting bleed air, the maximum altitude is reduced to _________ feet.
39,000
37,000
The minimum battery temperature for APU start is ______ ºC
-20
The rest period after the first two APU start attempts is _____ sec and _______ minutes after the third attempt.
60
30
List the APU critical faults:
___________ ____________
___________ ____________
___________ ____________
FADEC Failure
Overspeed / Underspeed
Failure to light / start
External Short
Failure to Accelerate
Loss of Speed Data
List the APU major faults:
_____________ ___________
_____________ ___________
_____________ ___________
Low oil pressure
EGT overtemperature
High oil temperature
Oil pressure switch shorted
Shorted / Open thermocouple
Loss of EGT
In case of an APU FIRE message, the memory item is:
APU FUEL SHUTOFF VALVE PUSH OUT
