APU - Auxilary Power Unit

Question 1

Type

Answer 1

Honeywell(Garret) GTCP 36-150

Question 2

MAX RPM

Answer 2

107%

Question 3

MAX EGT

Answer 3

743C

Question 4

START 1 and 2 - Battery

Answer 4

Start 1 - 30 seconds
Start 2 - 30 seconds
–followed by 20min off

Question 5

Start 1 and 2 - Ground Power

Answer 5

Start 1 - 15 Seconds
Start 2 - 15 Seconds
–followed 20 min off

Question 6

Delay between cranking

Answer 6

A two minute delay should be observed between cranking attempts to allow for cooling of starter and start contactor and for APU drainage.

Question 7

APU Bleed Air - Air conditioning

Answer 7

Bleed Air not permitted above 15,000

Question 8

APU Bleed Air - Enine start during ground operations

Answer 8

No Bleed Air extraction limitation. Each engine may be started using the APU bleed Air, then the operating engines thrust must not exceed 70% N2.

Question 9

Engine start during flight

Answer 9

During single engine operations, APU bleed Air extraction for an engine start is not permitted.

During double engine failure conditions, APU bleed Air extraction for engine starts is permitted. However, APU bleed Air extraction is 13,000ft and below.