APU

Question 1

What is the rated power output of the APU?

Answer 1

80hp

Question 2

What can bleed air be used for from the APU

Answer 2

Air conditioning and deicing only (auto off with WOW switch- not able to use for pressurisation)

Question 3

What type of generator is on the APU and what buses will it supply with power?

Answer 3

DC

All DC buses through bus tie logic

Question 4

Where does the APU get it’s fuel from?

Answer 4

Left collector bay

Question 5

What will the ESU do if there is an indication of an APU fire or failure?

Answer 5

Automatic fuel shutoff, shutdown, and fire extinguishing. Manual fire extinguishing also available if Auto system fails.

Question 6

What is the max load for the APU on the ground? Why is this different from the other DC generators?

Answer 6

1.0

Rear bay cooling fan prevents overheat as DC gens are air-cooled.

Question 7

How can we monitor load on APU?

Answer 7

Select gen 2 on DC panel and hold DC load meter button on APU panel.

Question 8

What Starting time limits apply to the APU and how will a start failure be indicated?

Answer 8

Same as normal engines (1/2/1/2/1/30)

APU FLR on amber on power switch. Will not allow reselection before time limit.

Question 9

How can we turn off the APU

Answer 9

Power switch
Overspeed test switch
APU fire test switch (cuts fuel)