APU

Question 1

APU:
If LOW OIL LEVEL is displayed on the APU SD page prior to APU start while on the ground.

Answer 1

Advise maintenance.
Can operate for 15 hours.

Question 2

APU:
Starter Limits

Answer 2

3 Starts then a 60 minute cooldown.

Question 3

APU:
Operating Envelope:

Answer 3

o Start Limit – 41450’.
o Electrical Use – 41450’.
o APU Start using batteries – 25000’.
o Electrical Use + APU bleed for 1 pack – 22500’.
o Engine Start Using APU Bleed – 20000’.
o Electrical Use + APU bleed for 2 packs – 17500’.