APU Flashcards
The APU provides ____.
a. electrical power
b. pneumatic air
c. both electrical power and pneumatic air
d. preconditioned air
C. both electrical power and pneumatic air
The APU start cycle may take as long as ____.
a. 120 seconds
b. 25 seconds
c. 60 seconds
d. 180 seconds
A. 120 seconds
With the APU operating, turning OFF the battery switch will cause the APU to ____.
a. continue running without supplying electrical power or bleed air
b. unload the APU generator
c. begin a 60 second cool down period
d. shutdown immediately
D. shutdown immediately
Fire protection for the APU is provided by ____ fire extinguishing bottle(s)
a. 1
b. 2
c. 3
d. 4
A. 1
The APU fire extinguishing agent discharges ____.
a. either automatically or manually
b. manually only
c. automatically only
d. both automatically and manually
B. manually only
The APU can be started with electrical power from ____.
a. AC Emergency Bus or the airplane battery
b. TR Bus 1 and the AC Emergency Transfer Bus
c. AC Transfer Bus 1 or the airplane battery
d. its own internal battery
C. AC Transfer Bus 1 or the airplane battery
With the APU blue MAINT light illuminated, the crew ____.
a. should move the start switch to OFF momentarily
b. should restart the APU after the auto shutdown
c. pull the APU fire handle
d. may continue to use the APU if needed
D. may continue to use the APU if needed
The APU EGT is displayed on the ____.
a. not displayed
b. lower MFD screen
c. forward overhead panel
d. upper MFD screen
C. forward overhead panel
In order to start the APU on a cold, dark airplane, the ____.
a. Battery switch must be ON and the cockpit APU fire handle must be IN. The ground control panel fire handle may be PULLED
b. battery switch must be ON, the cockpit APU fire handle must be IN, and the ground control panel fire handle must be IN
c. Battery switch must be OFF. The cockpit APU fire handle and the ground control panel fire handle may be IN or PULLED
d. Ground Service Bus must be powered by an external power source
B. battery switch must be ON, the cockpit APU fire handle must be IN, and the ground control panel fire handle must be IN
The APU can be started at altitudes up to ____ feet
a. 17,000
b. 41,000
c. 10,000
d. 25,000
B. 41,000
The APU Start Switch has ____ positions labeled.
a. OFF and ON
b. OFF, RUN, and START
c. OFF, ON, and START
d. OFF, ON and RUN
C. OFF, ON, and START
An automatic APU shutdown will occur for ____.
a. overspeed, fire, high oil pressure
b. low oil pressure, fault, overspeed
c. fault, overheat, low oil quantity
d. fire, high oil pressure, fault
B. low oil pressure, fault, overspeed
Which of the following will cause the APU to shut down?
a. Overspeed
b. High oil temperature
c. Fault
d. All of the above
D. All of the above
a. Overspeed
b. High oil temperature
c. Fault
d. All of the above
The maximum altitude for use of APU bleed air and electrical power is _____ feet.
a. 17,000
b. 25,000
c. 10,000
d. 14,000
C. 10,000
The maximum altitude for use of APU bleed air only is _____ feet.
a. 25,000
b. 14,000
c. 10,000
d. 17,000
D. 17,000
If airborne and the battery is the only available power source, APU start attempts are not recommended above ____ feet.
a. 25,000
b. 17,000
c. 10,000
d. 32,000
A. 25,000
On the ground, the APU ____.
a. attempts to carry a partial electrical load
b. cannot shed the galley
c. will power both transfer busses
d. will not power the main busses
C. will power both transfer busses
You observe these lights on after starting the APU, and they were not on prior to start. Which statement is the most correct?
a. The APU failed a self-check overspeed test and should not be used.
b. The APU had an overspeed fault and shut down automatically.
c. The APU overspeed light comes on during start and should extinguish shortly, indicating a good test.
d. You should shut down the APU for five minutes, and then attempt a second start.
B. The APU had an overspeed fault and shut down automatically.
If this light came on shortly after placing the APU start switch to on, __.
a. this is normal and the light will extinguish after the APU cooling time has commenced
b. this indicates the APU has overspeed and shut down
c. the overspeed shutdown protection feature has failed a self-test during a normal APU shutdown
d. this light informs the crew that overspeed protection is lost and the APU may be used if they monitor the EGT and Frequency meter
C. the overspeed shutdown protection feature has failed a self-test during a normal APU shutdown
After shutting off the APU that has an illuminated Overspeed light, the light will __.
a. extinguish immediately
b. remain on for five minutes and then extinguish
c. not extinguish until maintenance resets the system
d. blink to indicate that the system needs to be reset
B. remain on for five minutes and then extinguish
After 3 consecutive aborted start attempts on the APU, how long of a cooling period must be observed?
a. 15 mins
b. 10 mins
c. 3 mins
d. No limitations
A. 15 mins
(MAX) The blue MAINT light:
a. DOOR light has replaced the MAINT light on the control panel.
b. Has not changed in function.
c. Monitors APU door only.
d. Now monitors Exhaust Gas Temperature since the gauge has been removed.
A. DOOR light has replaced the MAINT light on the control panel.
