APU

Question 1

What will cause the APU to auto shutdown on the ground

Answer 1

Under speed
FADEC Fault
Over speed
Sensor Fail
High Oil Temperature 
EGT Fault
Low Oil Pressure
Fire

Question 2

What will cause the APU to auto shutdown in the Air

Answer 2

Underspeed
FADEC
Overspeed

Question 3

When you shutdown the APU what Source is taken away immediately

Answer 3

Bleed Source

Question 4

What electricity output does the APU give you

Answer 4

115Vac, 40kva, 400hz

Question 5

What battery powers APU FADEC

Answer 5

BATT 1

Question 6

When only DC power is available what provides fuel to the APU? From which Tank

Answer 6

The DC Fuel pump on the right wing.

Question 7

When AC Power is available and engine is off what pump provides fuel to the APU?

Answer 7

The AC Fuel Pump

Question 8

Is it possible to provide Fuel to the APU from the left wing tank?

Answer 8

Yes from the Fuel crossfeed Valve.

Question 9

APU can supply electrical power up to what altitude

Answer 9

33,000 feet

Question 10

APU can supply bleed for engine starting up to what altitude?

Answer 10

21,000

Question 11

APU can supply Bleed Air up to what Altitude

Answer 11

15,000

Question 12

Max altitude to start the APU

Answer 12

30,000

Question 13

What happens When you turn the APU Knob to on?

Answer 13

Powers the FADEC and opens the fuel SOV

Question 14

How long should you wait before starting the APU after power has been introduced to EICAS

Answer 14

30 seconds

Question 15

3 seconds after the APU has reached 95% what is available

Answer 15

Bleed and Electrical loading.

Question 16

When you shutdown the APU when do you loose Bleeds and when do you loose electrical.

Answer 16

Bleeds - Immediately

Electrical - After 1 minute cool down.

Question 17

How do you know when the APU shutdown cool down period is over?

Answer 17

APU SHUTTING DOWN message disappears.

Question 18

What happens if you turn the APU Knob back to ON while during the shutdown period?

Answer 18

It cancels the shutdown and gives you back the APU.

Question 19

Can the APU be started with BATT 1 Dead?

Answer 19

No, you need At least BATT 1 and DC Ground Power to replace a dead BATT 2.

Question 20

When shutting down APU. What are you looking for before turning off the batteries

Answer 20

Wait until you have the cyan off message