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Systems > APU / BLEED / PRESS > Flashcards

APU / BLEED / PRESS Flashcards

1
Q

Max alt to assist engine start

A

20’000ft

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2
Q

APU BLEEF

Max alt air cond and press single pack operation

A

22500 ft

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3
Q

APU BLEED

Max alt for air con and press (dual pack operation)

A

15000ft

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4
Q

Can you use APU BLEED for WAI

A

NO

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5
Q

APU battery restart limit

A

25,000ft

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6
Q

APU elec power only

A

Above 22,500ft

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7
Q

Engine flameout no performance issue

Bleed config?

A

OPEN X BLEED

Working engine working pack

WAI available

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8
Q

Engine flameout WITH PERF issue - bleed config

A

DO NOT SELECT X BLEED OPEN

Working engine working pack

WAI NOT AVAIL

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9
Q

ENG 2 FIRE PB pressed

Bleed config

A

Close X BLEED

APU BLEED AVAIL

Working engine working pack

WAI not avail

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10
Q

Eng 1 Fire PB pressed

Bleed config

A

Perf issue yes? DO NOT USE APU BLEED
Perf for GA - p2 off on approach

DO NOT SELECT X BLEED OPEN (could close?)

Working engine working pack

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11
Q

2 times WAI not avail post engine problem

A

Flameout + perf issue

Any Fire/damage

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12
Q

What operates the cross bleed valve?

A

2 elec motors

1 auto mode, 1 man mode

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13
Q

Temp region achieved by the pre cooler

A

200 deg

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14
Q

Hot air fault light comes on what happens

A

Hot air valve closes, trim air valves close

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15
Q

What happens if both lanes of ACSC fail?

A

Loose the pack

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16
Q

Hot air valves failed in open pos

A

No effect

17
Q

How is pack flow control valve operated

A

Pneumatically operated

Electronically controlled

18
Q

What is connected to the mixer unit

A

Packs
Cabin air
Ram
LP

19
Q

During landing run the ram air inlet flaps open when speed is less than

A

70kt (20 sec delay)

20
Q

What happens when DITCHING pb is pressed?

A

Closure signal to:

Vent extract valve
Outflow valve
Ram air inlet
Pack flow control valve

21
Q

Purpose of safety valves

A

Prevent over or under pressure

22
Q

When does outflow valves go amber in flight

A

Valve opens more than 95% in flight

23
Q

When do safety valves open

A

8.6psi above ambient pressure

Systems (12 decks)

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