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+4)+"@## > 900 Air Conditioning And Pressurization > Flashcards

900 Air Conditioning And Pressurization Flashcards

1
Q

In the event of dual pack failure what provides air

A

Ram air switchlight

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2
Q

Using the ram air switch light the air enters which supply system

A

The left supply system

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3
Q

How many avionic cooling fans are there and when will they operate?

A

Fan 1 - Operates during flight or on the ground as alternate

Fan 2 - Operates on the ground or in flight as alternate

Standby fan - Operates as backup

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4
Q

When smoke is detected in the cargo bay

A

The heater power is removed and the shut off valves automatically close

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5
Q

How many Galley heaters do we have

A

Two 500 W heaters to supply heat to the galley and Service door area

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6
Q

Cabin pressure is maintained and controlled by

A

1 electro pneumatic outflow valve.

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7
Q

If cabin altitude exceeds 14,000 feet

A

Passenger oxygen masks deploy

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8
Q

The outflow valves are automatically controlled by

A

Either of two independent Cabin pressure controllers

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9
Q

How many CPC’s

A

2

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10
Q

The pressure controller automatically switches on the ground when

A

On the ground for three minutes

The active CPC is displayed on the ECS synoptic page

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11
Q

EMER DEPRESS

A

Opens bothoutflow valves

14250 (plus or minus750)

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12
Q

FASTEN SEATBELT SIGN

and

NO SMOKING SIGN

comes on automatically when

A

Cabin altitude is at or above 10,000 feet

Pax sign in auto

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13
Q

What cools packs

A

Ram air

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14
Q

Ram air also provides cooling airflow to

A

Cooling of number one and two hydraulic system fluids

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15
Q

How many recirc fans are there

A

2

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16
Q

What are the two avionics exhaust fans used for

A

To extract the heated air from behind the flight compartment displays and from the avionics equipment

On the ground the heated air is dumped overboard through the ground outflow valve

Inflight the heated air is ducted to the pressurization outflow valve and dumped overboard

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17
Q

OVBD COOL FAIL status?

A

Overboard exhaust shutoff valve Has failed closed with the aircraft on the ground and the passenger door unlatched

18
Q

OVBD COOL caution

A

Over board exhaust shutoff valve is not closed with the passenger door and service door closed

Aircraft will not pressurize

19
Q

When will you see a CABIN ALT WARNING message?

A

When the cabin altitude is greater than 10,000 feet.

20
Q

When will you see a DIFF PRESS WARNING message?

A

When the cabin differential pressure greater than 8.6 PSI

21
Q

When will you see a CABIN ALT caution message?

A

When the cabin altitude is greater than 8500 feet but not greater than 10,000 feet

22
Q

Pressurization is controlled by

A

A single electric controlled outflow valve

23
Q

What happens if both CPC’s fail?

A

Outflow valves go to a barometric hold

24
Q

With the cargo fan switch in the Air position?

A

Recirc air keeps temp above freezing.

25
Q

With the cargo fan switch in the Cond air?

A

The heater is on.

26
Q

What happens to the packs when either engine start switch light is pressed in the 900?

A

The pack valves automatically close

Controlled by a ACSC

27
Q

Are both forward and aft cargo compartments pressurized?

A

Yes

28
Q

Which cargo bay is ventilated by conditioned air?

A

Only the aft cargo bay

29
Q

Aft cargo switch should not be selected to conditioned air when?

A

Ambient temps are above 15°C

30
Q

How are all phases of pressurization controlled in the Auto mode?

A

Through two cabin pressure controllers

Only one controller is active

Switches three minutes after WOW

31
Q

How many outflow valves are there?

A

1, Located on aft pressure bulkhead

32
Q

How many pressure safety valves are there?

A

2, one for overpressure and one for negative pressure relief.

33
Q

How are the safety valves operated?

A

Pneumatically operated and spring loaded closed

34
Q

What is the purpose of the ground valve?

A

Ensures aircraft is depressurized on ground

Also dumps CRT and avionics air overboard

35
Q

When do oxygen masks drop?

A

14,000 feet plus or -300

36
Q

With a failure of the CPC??

A

Auto oxygen mask deployments and illumination of fasten seatbelt and no smoking signs will not occur

37
Q

The Maximum negative differential pressure is?

A

-.5 psi

38
Q

Recirculation fan must be switched off when the cabin temperature is warmer than

A

30 degrees

39
Q

AFT CARGO SWITCH?

A

Do not select conditioned air until ambient temperatures are above 15°C

40
Q

PACK stands for

A

Pneumatic Air Conditioning Kit

+4)+"@## (19 decks)

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