Auxiliary Power Unit

Question 1

APU type

Answer 1

Honeywell RE220-RJ

Question 2

Where is it located

Answer 2

Tail cone

Question 3

What does the APU do?

Answer 3

Powers an electrical generator and supplies compressed pneumatic air for use on the ground and in flight.

Question 4

What do you do if theres a fire in the APU compartment

Answer 4

On a two loop fire detection system with self discharging bottle (while on the ground)

Question 5

Primary function

Answer 5

to drive the electrical generator and supply bleed air for engine starting and AC

Question 6

Fuel is fed to the APU from what tank?

Answer 6

Left, and is DC powered and allows the APU to operate without any ground equipment.

Question 7

MAX RPM

Answer 7

106%

Question 8

Min main and APU voltage required to start?

Answer 8

22v

Question 9

Max operating Alt

Answer 9

41,000 ft

Question 10

Max starting Alt

Answer 10

37,000 ft

Question 11

APU door open limitations

Answer 11

220kts or APU running

Question 12

ECU performs what functions?

Answer 12

Protects the APU from abnormal operation,

Monitors all functions of the APU

performs the APU start up and shutdown

Question 13

How is the APU normally started while on the ground?

Answer 13

Electric start