APU

Question 1

Max alt to start APU?

Answer 1

FL300

Question 2

Max alt use for engine start?

Answer 2

FL210

Question 3

Max alt use for AC electrical power?

Answer 3

FL 330

Question 4

When is air and AC power available after APU start?

Answer 4

When reaching 95% plus three seconds.

Question 5

On ground starting sequence?

Answer 5

FADEC initiates ignition after approximately 6% RPM and fuel flow after .5 second. Bat two energizes electronic starter controller. After light off FADEC commands starter cut out at 50% rpm.

Question 6

GPU air start sequence.

Answer 6

Ignition starts at 7 to 17% and fuel flow at .5 second. Starter cut off at 50%.

Question 7

Shutdown sequence

Answer 7

When knob rotated to off pneumatic power removed immediately. Electrical power removed at end of two minute cool down period. APU SHUTTING DOWN message appears at end of that period.

Question 8

FADEC APU protection on ground

Answer 8

Overspeed
Under speed
FADEC Critical fault
APU FIRE
APU EGT over temp 
High oil temp 
Low oil pressure
Sensor fail

Question 9

APU FADEC protection in the air

Answer 9

Overs speed
Under speed
FADEC critical fault

Question 10

Max altitude to provide air for conditioning?

Answer 10

15,000