APU

Question 1

The APU starting envelope is limited to _____ ft.

Answer 1

30,000 Ft

Question 2

The APU can be starting using which two electrical sources?

Answer 2

Batt 2

DC GPU

Question 3

The APU operation is limited to ______ ft.

The APU provides what at this altitude?

Answer 3

33,000 ft.

AC Electrical Power

Question 4

Air is provided for engine starting up to ______ ft.

Answer 4

21,000 ft.

Question 5

Air is provided fr the air management system (AMS) up to _______ ft.

Answer 5

15,000 ft.

Question 6

(T/F) The APU has FADEC and is automatically controlled

Answer 6

True

Question 7

The APU will do a normal shutdown when in the OFF position after a __ min. cooldown

Answer 7

2 Minute

Question 8

Turning the APU switch from OFF to ON during start, what happens?

Answer 8

FADEC turns on

Aircraft APU fuel shut of valve opens

Question 9

Turning the APU switch from ON to START during start, what happens?

Answer 9

The Starter Controller is started which energizes the starter

Question 10

At __% the fuel is introduced for APU start

Answer 10

~7%

Question 11

At __% the exciter and starter cutout when starting the APU

Answer 11

~50%

Question 12

When the APU reaches __% for __ seconds electrical and pneumatic power become available

Answer 12

97% for 3 seconds

Question 13

(T/F) If the APU GEN is not the only source of AC power then the APU GEN will be taken off-line as soon as the APU MASTER switch is rotated from ON to OFF

Answer 13

True

Question 14

(T/F) If the APU GEN is the only source of AC power then the APU GEN will remain on-line for the entire shutdown process

Answer 14

True

Question 15

(T/F) When the APU MASTER switch is rotated from ON to OFF the pneumatic power is always removed immediately

Answer 15

True

Question 16

When will the APU automatically shutdown when on the ground? (8)

Answer 16

APU Overspeed
APU Underspeed
APU Fire
EGT Overtemperature
High Oil Temp.
Low Oil Press.
FADEC Critical Fault
Sensor Fail

Question 17

When will the APU automatically shutdown when in flight? (3)

Answer 17

APU Overspeed
APU Underspeed
FADEC Critical Fault

Question 18

APU FAIL message is what color?

What does it mean?

Answer 18

Amber

APU automatic shutdown

Question 19

APU FAULT message is what color?

What does it mean?

Answer 19

Blue

A major fault is active but shutdown is inhibited due to inflight situation