APU Flashcards
T/F: The APU can be used during flight.
FALSE, Ground Only operation
T/F: The APU can only be used on the ground.
TRUE
On which side of the fuselage is the APU air intake located?
Right rear side of the tailcone
Which of the following combinations causes the highest fuel burn while operating the APU?
Highest fuel burn is Generator ON and Bleed Air ON (270 lbs/hr)
When will the fuel shut off valve automatically close on the APU?
PWR switchlight pushed OFF Airplane airborne Fire detected in tailcone EXTG (Extinguish) pushlight is pushed APU fire test button is pushed Starter-Generator overheats APU fault is detected
The APU is started with _____.
Main & Aux batteries
or
External power
Pressing the PWR switchlight on the APU control panel, in preparation for APU start, does which of the following?
Opens APU fuel shut off valve
Arms start circuits
Performs a brief self-test
T/F: The APU cannot be used as a source of bleed air on the ground.
FALSE, it can be used as a bleed air source
T/F: APU bleed air can operate in conjunction with engine bleed air.
FALSE, it cannot be used in conjunction
T/F: APU bleed air cannot operate in conjunction with engine bleed air.
TRUE
T/F: The APU can be used while the aircraft is airborne.
FALSE, the APU is limited to ground operations only
T/F: The APU can be used on the ground for electrical, pneumatic, and hydraulic power.
FALSE, the APU does not provide hydraulic power
When ready to start the APU, what should be accomplished after pressing the PWR switchlight?
Verify green APU fuel valve open advisory light illuminates
The green ON light illuminates on the APU GEN switchlight when the APU is running at full speed and can supply which of the following?
28VDC power
Where can the APU’s electrical load be monitored?
MFD electrical page
T/F: Once the APU is at normal operating speed, APU bleed air is automatically supplied with no pilot input.
FALSE, the APU BL AIR switchlight must be pressed and “OPEN” illuminated
What color is the light that illuminates when the APU Fuel valve is OPEN?
Green advisory light on APU fire protection panel
T/F: If the APU generator overheats, the APU will automatically shut down.
TRUE
What will happen if an APU generator fault is detected?
Generator disconnected from DC electrical system,
ON light extinguishes from switchlight,
GEN WARN advisory light illuminates on switchlight
Fuel for the APU operation is supplied from which fuel tank?
Left wing collector bay
What does the APU GEN WARN light indicate?
Any of the following:
Generator has not been selected with the APU running
Generator is selected on but does not come on-line
Generator is taken off line due to a malfunction
