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Dash Tech > Pneumatics And Air Conditioning > Flashcards

Pneumatics And Air Conditioning Flashcards

1
Q

How many bleed sources are there per engine?

A

2 (NL and NH)

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2
Q

When does Nh bleed air help to supply the pnuematic system?

A

when pnuematic pressure is below 55PSI in the air or below 65PSI on the ground

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3
Q

When does the 18PSI system recieve pressure

A

when the engine is on

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4
Q

BLEED HOT

A

bleed air exceeds 287 deg. valves auto close

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5
Q

If one bleed valve is closed, will pressurisation be affected?

A

No

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6
Q

What do the air conditioning packs provide?

A

conditioned air to the cabin and flight deck, air for pressurisation

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7
Q

If one air con pack is off will pressurisation be affected?

A

No

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8
Q

How many air con packs are there?

A

2

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9
Q

If both packs are off will pressurisation be affected?

A

Yes - no bleed air in

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10
Q

CABIN PACK HOT

A

1 pack air cycle machine exceeds 207deg or 75psi. Auto shutoff/valve close

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11
Q

FLT COMP PACK HOT

A

2 pack air cycle machine internal temp 207deg or 75psi. Auto valve shutoff

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12
Q

How is the Air conditioning system controlled in manual mode?

A

with the cold/hot toggles

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13
Q

How many outflow valves are there?

A

3 (2 AUTO rear, 1 manual front)

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14
Q

How are the rear outflow valves opened and closed?

A

using 18PSI against a spring, controlled by the pressure controller unit

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15
Q

What happens if the aircraft lands pressurised?

A

the cabin will climb at 600ft/min for 1min then dump (with less than 2.5PSI diff)

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16
Q

What is needed for DUMP valve switch to operate in the air?

A

switch needs to be powered, 18PSI air.

17
Q

Normal max cabin pressure diff?

A

5.5PSI +-0.3

18
Q

Max cabin diff (pressure relief valve)

A

5.95PSI

19
Q

What does the manual knob do?

A

changes the forward outflow valve to alter cabin alt

20
Q

What does the manual switch on the f/o side panel do?

A

fully opens the forward outflow valve (DUMP)

21
Q

what are the 4 main modes of the pressurisation system?

A

AUTO, MAN, DUMP, CAB SET

22
Q

Max cabin alt?

A

8000ft

23
Q

How would you manually set a lower cabin alt?

A

Semi auto(cab set) - set desired cabin altitude (unpressurised at that level when on descent)

24
Q

What is the cabin rate of climb and descent at the detent?

A

500ft/min climb, 300ft/min descent

25
Q

What does the fault light mean on the pressure controller mean?

A

Pressure controller has failed. Rear valves fully shut

26
Q

what will happen to cabin altitude if pressure controller fails?

A

cabin altitude will rapidly decrease until max diff is reached, and stay at 5.95psi.

27
Q

CABIN PRESS

A

Cabin altitude exceeded 10000ft. Emergency descent to 10k or MSA.

28
Q

Memory items EMERG descent?

A

Oxy Mask on
Mic switch mask,
pax signs on
emerg descent, accomplish A/req (P/L FI, C/L max, maintain Vmo)

29
Q

In an electric failure, what positions do the compressor bleed valves default to?

A

NL open

NH closed

30
Q

Which pack is selected when bleed set to MIN

A

Pack 2

31
Q

DUCT HOT

A

outlet of a pack is over 88deg. Auto to full cold.

32
Q

Where are the temp sensors for cabin temp?

A

by the CAPT feet, under 5A, At the outlet ducts

33
Q

Which pack(s) work with the APU on?

A

Both when set to NORM

34
Q

Why do we need to turn the APU bleed air off before opening engine bleeds?

A

There’s no one way valve so the pressure will cause APU to stall/surge

35
Q

What bus is the Pressure controller connected to

A

L MAIN

36
Q

Which valve(s) have the 5.95PSI regulator?

A

All 3

37
Q

If you switch to manual pressurisation and the manual knob is fully anti-clockwise, what should you do first?

A

Bleed to MIN or off first (stops large drop in cab alt)

38
Q

Will a pressure controller fault bring on the Master caution?

A

No

39
Q

What is the Cabin PSI max on the ground?

A

0.5PSI

Dash Tech (20 decks)

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