APU Panel Flashcards Preview

Spirit A320 Oral Study Guide - last update 2016 > APU Panel > Flashcards

Flashcards in APU Panel Deck (10)
Loading flashcards...
1
Q

What does the APU MASTER SW pb to ON do?

A
  • Electrically powers the APU system (Blue ON light in pb)
  • ECB performs a power up test
  • APU ECAM page appears (if EXT or ENG GEN AC power is available)
  • APU air intake flap opens
  • APU fuel isolation valve opens
  • APU fuel pump operates (if no tank pumps are on)
2
Q

What happens when you push the APU START pb?

A
  • Blue ON light illuminates
  • When APU air intake flap opens the starter is energized
  • Ignition is turned ON 1.5 seconds after starter is energized
  • Starter is de-energized and ignition turned OFF at 55% N
  • Blue ON light in START pb extinguishes
  • Green AVAIL light illuminates 2 seconds after 95% N or above 99.5% N
  • APU page disappears from the ECAM 10 seconds later
3
Q

With the APU running and supplying bleed air, how do you shut it down?

A
  • APU BLEED pb OFF
  • APU MASTER SW OFF
  • APU will cool down and then shut down
4
Q

What does the green AVAIL light on the APU START pb indicate?

A

The APU is available to provide electrical power and/or bleed air

5
Q

With the APU green AVAIL light ON and the EXT PWR green AVAIL light on, which system is powering the
aircraft?

A

APU

6
Q

If the APU is running, is it necessary to manually select APU BLEED OFF prior to APU shutdown?

A

No. When the APU MASTER SW is selected OFF, the bleed air valve is closed and the APU is allowed to cool prior to shutdown

7
Q

During the cool down cycle can you still use the APU?

A

Yes, press the APU MASTER SW pb

8
Q

An amber FAULT light in the APU MASTER SW pb indicates?

A

An APU auto shutdown has occurred

9
Q

What does an amber FAULT light in the APU BLEED pb mean?

A

An APU bleed leak

10
Q

Does APU air or electric have priority?

A

Electric