APU limitations

Question 1

Min Temp Start

Answer 1

-40°C -40°C -40°C

Question 2

Max Ops Alt for the APU

Answer 2

37,000 ft 39,000 ft (SW) 39,000 ft (SW)

Question 3

Max Start Alt

Answer 3

30,000 ft 37,000 ft 37,000 ft

Question 4

Max Alt Bleed use

Answer 4

15,000 ft 25,000 ft 25,000 ft

Question 5

Max Alt Eng Start

Answer 5

13,000 ft 21,000 ft 21,000 ft

Question 6

Max Door Open with APU not operating

Answer 6

300 KIAS 220 KIAS 220 KIAS

Question 7

CRJ 200 APU STARTER DUTY CYCLE

Answer 7

Question 8

CRJ 700/900 APU STARTER DUTY CYCLE

Answer 8

• No more than three starts/start attempts in one hour
• A two minute delay must be observed between cranking attempts