3.5 APU

Question 1

APU Starting Limitations on Battery <-200>

Answer 1

Start

Max Time ON

Followed By

1

30 seconds

2 minutes OFF

2

30 seconds

20 minutes OFF

3

30 seconds

2 minutes OFF

4

30 seconds

40 minutes OFF

The 2 minutes delay must be observed between cranking attempts to allow for cooling of the starter and start contactor and APU fuel drainage

Question 2

APU Starting Limitations using DC Ground Power <-200>

Answer 2

Start

Max Time ON

Followed By

1

15 seconds

2 minutes OFF

2

15 seconds

20 minutes OFF

3

15 seconds

2 minutes OFF

4

15 seconds

40 minutes OFF

The 2 minutes delay must be observed between cranking attempts to allow for cooling of the starter and start contactor and APU fuel drainage

Question 3

APU Starting Limitations <-701>, <900>

Answer 3

The APU starter motor duty cycle is limited to not more than three (3) attempts in one (1) hour with a two (2) minute delay between cranking attempts

Question 4

Bleed air extraction from the APU is not permitted above <-200>

Answer 4

15,000 ft

Question 5

Bleed air extration from the APU is not permitted above <-701>, <900>

Answer 5

25,000 ft

Question 6

If both engines are to be started using the APU bleed air, the operating engine’s thrust must not exceed 70% N2 <-200>

Answer 6

70% N2

Question 7

WIth the APU door not closed or the door position is unknown, the airplane must be limited to_______, or________<-200>

Answer 7

300 KIAS or the APU must remain in operation

Question 8

With the APU door not closed or the door position is unknown, the airplane must be limited to_______ , or_________<-701>, <900>

Answer 8

220 KIAS or the APU must remain in operation