How long after APU shutdown can the battery be switched to off ?
Immediately, no limit
30 Seconds
20 Seconds
1 Minute
If the blue MAINT light illuminates while the APU is being operated, which answer is correct ?
The APU will automatically shut down
The crew must immediately shut down the APU
The APU may continue to be operated until maintenance can perform service
The APU may be operated for no more than 5 minutes after the light illuminates
The APU may be used as the sole source of electrical power to an altitude of ?
41,000 feet.
35,000 feet.
17,000 feet.
10,000 feet.
The APU may be used as a source of bleed air to what altitude ?
17,000 feet.
10,000 feet.
35,000 feet.
41,000 feet.
The APU may be used as a source of bleed air and electrical power to what altitude ?
10,000 feet.
17,000 feet.
35,000 feet.
41,000 feet.
The APU can power both AC transfer busses ?
on the ground or airborne.
on the ground only.
when airborne only.
After starting, how long should the APU be allowed to run before using it as a bleed source ?
1 minute.
20 seconds.
2 minutes.
APU bleed air may be used immediately after start.
AC electrical power is used to start the APU
directly from an AC ground power source if the battery switch is ON.
if transfer bus 1 is powered and the battery switch is ON.
if a ground service bus is powered.
if transfer bus 2 is powered.
The APU start cycle may be as long as ?
2 minutes.
1 minute.
20 seconds.
45 seconds.
The APU generator is available for use ?
when the APU GEN OFF BUS light is illuminated.
when the APU EGT has stabilized after the start sequence is complete.
when the ammeter shows acceptable volts and frequency.
1 minute after the start cycle is complete.
If the APU OVERSPEED light illuminates during shutdown
the overspeed shutdown protection has failed a self test.
the APU has experienced an RPM overspeed during the shut down cycle.
an overspeed self test is in progress during the shut down cycle.
the overspeed protection self test was successful during the shut down sequence.
Which of these four lights will not cause an automatic shutdown of the APU ?
MAINT
FAULT
LOW OIL PRESSURE
OVERSPEED
After an APU start using battery power what indications will be read on the electrical metering panel before the APU generator is placed on the bus(ses) ?
0 Volts and 0 CPS.
115 Volts, 400 CPS and 0 AC AMP.
0 Volts, 400 CPS and 0 AC AMP.
115 Volts, 0 CPS and 0 AC AMP.
Turning the battery switch to OFF ?
will shut down the APU.
will shut down the APU in flight only.
will shut down the APU on the ground only.
has no effect on APU operation once the start cycle is complete.
If the APU GEN OFF BUS is not illuminated after the start cycle is complete
the electrical metering panel must be used to check that the APU generator is ready to be placed on line.
a fault exists and the FAULT light illuminates.
a fault exists and the MAINT light illuminates.
the APU generator is available if the start cycle is complete.
How many APU start attempts may initiated on the ground ?
One.
Two, with a four minute interval between the next attempt.
Four, with a two minute interval between the first and subsequent attempts.
No limitation is specified.
If electrical demand on the ground exceeds the overload value, the APU generator automatic load shedding will ?
shed both main busses first.
shed one galley bus and one main bus first.
initiate the automatic shut down sequence.
shed both galley busses first.
What automatic shutdown protections are provided by the APU Electronic Control Unit (ECU) ?
EGT exceedance, overspeed, low oil pressure, high oil temperature, APU fire, fuel control unit failure, fault.
High oil temperature, overspeed, APU fire, fuel control unit failure, electrical overload.
EGT exceedance, overspeed, low oil pressure, high oil temperature, fault.