APU

Question 1

After 3 consecutive APU start attempts, the flight crew must wait how long until performing a new start ?

Answer 1

1 hour

Question 2

Maximum N (rotor) Speed ?

Answer 2

107%

Question 3

Maximum EGT for APU Start (below 35,000ft) ?

Answer 3

1,090°C

Question 4

Maximum EGT for APU Start (above 35,000ft) ?

Answer 4

1,120°C

Question 5

Maximum EGT for APU Running ?

Answer 5

675°C

Question 6

APU Start permitted with following restrictions during REFUELLING/ DEFUELLING ?

Answer 6

• if APU fails to Start following an Automatic Shutdown - DO NOT START APU !
• if a Fuel Spill occurs - Perform a NORMAL APU Shutdown

Question 7

APU Ground Operation between which Altitudes ?

Answer 7

-1,000ft & 14,500ft

Question 8

Maximum Altitude for APU Start on Batteries ONLY ?

Answer 8

25,000ft

Question 9

Maximum APU Operation & Normal Start Altitude ?

Answer 9

41,000 ft

Question 10

ELEC PWR ONLY from APU Altitude .. ?

Answer 10

Above 25,000ft

Question 11

APU Supplies BLEED & ELEC PWR below which Altitude ?

Answer 11

Below 25,000ft

Question 12

Maximum Altitude to Assist Engine Start via APU BLEED ?

Answer 12

20,000ft

Question 13

Maximum Altitude for AC & Pressurisation (Single PACK Operation) ?

Answer 13

22,500ft

Question 14

Maximum Altitude for AC & Pressurisation On (Dual PACK Operation) ?

Answer 14

15,000ft