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

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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4
Q

Where is the APU fuel fed from?

A

Left side tank pumps

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5
Q

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

A

Air intake flap

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6
Q

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

A

10

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7
Q

What is the APU battery restart altitude limit?

A

25000ft

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8
Q

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

A

22500ft

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9
Q

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

A

15000ft

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10
Q

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

A

20000ft

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11
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)

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12
Q

Can APU be used for anti ice?

A

No

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13
Q

What is APU battery start ceiling?

A

25000ft

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14
Q

What is max altitude to use APU to start engine?

A

20000ft

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15
Q

APU max number of start cycles permitted?

A

3 followed by 1 hour cooldown

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16
Q

APU fuel burn in flight?

A

50kg/hr