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Command Preparation > 49 APU > Flashcards

49 APU Flashcards

1
Q

When does the APU AVAIL light show?

A

N >95%

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2
Q

What does the small green triangle above the APU GEN on the APU SD page show?

A

APU line contactor (closed if green)

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3
Q

Advisory range for APU GEN load?

A

> 100%

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4
Q

Advisory range for APU GEN voltage?

A

> 120V or <110V

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5
Q

Advisory range for APU GEN frequency?

A

> 410Hz or <390Hz

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6
Q

Max EGT for APU on startup?

A

1090 degC

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7
Q

Max EGT for APU whilst running?

A

675 degC

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8
Q

When does the APU auto shutdown?

A

APU shut off switch on external power panel pushed, or
APU FIRE pb pushed, or
APU fire detected on ground, or
APU reaches relevant MAX EGT

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9
Q

Where is the APU fuel fed from?

A

Left side tank pumps

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10
Q

If the APU SD page shows “FLAP OPEN”, which flap is this?

A

Air intake flap

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11
Q

How many hours of operation do you have on APU LOW OIL LEVEL?

A

10

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12
Q

When does the APU MAX EGT turn amber on the APU SD page?

A

MAX EGT -33 degC

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13
Q

When does the APU N% turn amber and then red on the APU SD page?

A

102% amber then 107% red

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14
Q

What is the APU battery restart altitude limit?

A

25000ft

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15
Q

At what altitude is APU bleed air available with 1 pack?

A

22500ft

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16
Q

At what altitude is APU bleed air available with 2 packs?

A

15000ft

17
Q

At what altitude can the APU be used to assist in restarting an engine?

A

20000ft

18
Q

What does the ECB set the APU speed to? What about if the ambient temperature is between -18 and +35 degC?

A

100%

Unless temperature within “normal” range -18 to +35 degC and air conditioning demanded, in which case 99% (APU BLEED ON essentially)

19
Q

After APU OFF, and APU BLEED was being used, how long will it take for the APU to fully shutdown and the flap to close?

A

2 minutes

Cooling period after bleed air use is 60s to 120s

Command Preparation (31 decks)

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