Limitations APU

Question 1

APU Start

After _ consecutive APU start attempts, the flight crew must wait __ min before a new start
attempt.

Answer 1

APU Start
After three consecutive APU start attempts, the flight crew must wait 60 min before a new start
attempt.

Question 2

Rotor speed
Maximum N speed -> ___ %

Answer 2

Rotor speed
Maximum N speed -> 107%

Question 3

Maximum EGT for APU start (below 35 000 ft)-> _____ °C

Answer 3

Maximum EGT for APU start (below 35 000 ft)-> 1090 °C

Question 4

Maximum EGT for APU start (above 35 000 ft-> ____ °C

Answer 4

Maximum EGT for APU start (above 35 000 ft-> 1120 °C

Question 5

Maximum EGT for APU running-> ___ °C

Answer 5

Maximum EGT for APU running-> 675 °C

Question 6

Bleed Air and Elec Power -> up to _____ ft

Answer 6

Bleed Air and Elec Power -> up to 25000 ft

Question 7

Electric Power only - up to _____ ft

Answer 7

Electric Power only - up to 41000 ft

Question 8

Ground operation - up to _____ ft

Answer 8

Ground operation - up to 14500 ft

Question 9

APU battery restart limit -> _____ ft

Answer 9

APU battery restart limit -> 25000 ft

Question 10

Max altitude to assist engine start -> _____ ft

Answer 10

Max altitude to assist engine start -> 20000 ft

Question 11

Max altitude for air conditioning and pressurization (single pack operation)-> _____ ft

Answer 11

Max altitude for air conditioning and pressurization (single pack operation)-> 22500 ft

Question 12

Max altitude for air conditioning and pressurization (dual pack operation)-> _____ ft

Answer 12

Max altitude for air conditioning and pressurization (dual pack operation)-> 15000 ft

Question 13

Use of APU bleed air for wing anti-ice is ___ permitted.

Answer 13

Use of APU bleed air for wing anti-ice is not permitted.