APU

Question 0

APU EGT limit

Answer 0

Red line

Question 1

APU ambient temp start limit

Answer 1

-40C ground, -65C flight

Question 2

APU start alt limit

Answer 2

FL 370

Question 3

APU airspeed limit

Answer 3

Vmo/Mmo

Question 4

APU starter limit

Answer 4

3 start attempts per 60 minutes with minimum 2 min delay between cranking attempts to allow for cooling of starter, contractor, and to allow for APU drainage

Question 5

APU RPM & EGT limits

Answer 5

Red line

Note: max EGT 1038C under any conditions

Question 6

APU Gen loading alt limit

Answer 6

FL 410

Question 7

APU bleed air extraction alt limit

Answer 7

FL 250

Question 8

APU bleed air extraction on ground

Answer 8

No limit

Question 9

APU bleed air for engine start alt limit

Answer 9

FL 210

Question 10

APU indicator operating ranges

Answer 10

EGT 0-806 redline 807

RPM 0-106 redline 107

Question 11

While Flying you have an APU fire indication. Will the APU shutdown in flight?

Answer 11

Yes it will, but you have to press “APU fire push” and “bottle arm to discharge” switch light.