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Q400 > Air Conditioning - Pressuirisation > Flashcards

Air Conditioning - Pressuirisation Flashcards

1
Q

How many packs are there?

A

Two (air cycle machines ACM)

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2
Q

Where are the packs located?

A

In the unpressurised aft equipment bay

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3
Q

What does the recirc fan do?

A

Mixed cabin air with the conditioned air from the packs

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4
Q

If there is a dual pack (ACM) failure what will provide air to the flight comp and cabin?

A

Emergency Ram Air ventilation system

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5
Q

What does the ECU do to the recirc fan?

A

When recirc fan is on it starts slow speed until the ECU automatically selected high speed when req

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6
Q

If one pack is off what speed does the recirc fan operate at?

A

Slow speed

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7
Q

Temperature Gauge selector positions?

A

Cabin duct supply temp
Cabin temp
Flight comp duct supply temp

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8
Q

Automatic pack operation when AUTO switch is selected allows for what?

A

ECU controls the FCSOV and pack bypass valve which regulates the cabin and flight Comp temperatures using the temp control knobs

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9
Q

Manual operation of pack temp what happens?

A

ECU only controls only the pack bypass Valve. The FCSOV will be full open

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10
Q

What valves are closed when packs are turned off?

A

FCSOV
Pack bypass SOVs
Turbine shut off valves
Both ACMs shutdown

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11
Q

Air flow distribution with 2 ACMs?

A

Flight Comp receives 50% left pack
Cabin receives 50% left pack
Cabin revives 100% right pack

Therefore cabin receives approx 75% of the airflow

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12
Q

Single pack operation how much capacity is it providing?

A

70% of the two pack operation

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13
Q

Does there flight compartment temperature selector effect the cabin temp?

A

Yes because half the air from the left pack goes to the cabin

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14
Q

Is upper and lower vent selection available in FA control panel?

A

No only on the classic

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15
Q

When will the inlet and outlet valves close in the aft baggage compartment?

A

Loss of electrical power or if smoke is detected

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16
Q

Is the avionics cooling system automatic for normal and abnormal operation?

A

Yes

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17
Q

How many avionics fans are there?

A

3
Fan 1 and 2 and a standby fan

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18
Q

If two avionics fan fails what can we see?

A

FANS FAIL in white on the ED
AVIONICS caution light illuminated only on ground not in air

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19
Q

When will a pack shut down?

A

Selected OFF
ECU built in test detects unacceptable condition
CABIN PACK HOT
FLT COMP HOT
CABIN DUCT HOT
FLT COMPT DUCT HOT

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20
Q

When will a CABIN PACK HOT or FLT COMPT PACK HOT caution light extinguish?

A

Until condition has cleared and the switch is in the OFF position

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21
Q

External ground air port?

A

Aft right side

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22
Q

Pressurisation area goes from? Front to back

A

Forward pressure bulkhead to aft pressure dome

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23
Q

How many outflow valves?

A

3

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24
Q

What are the outflow valves called?

A

Forward safety valve
Aft safety valve
Aft outflow valve

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25
Q

Pressurisation system modes?

A

Auto
Manual
Emergency/ smoke removal
Dump

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26
Q

Pressurisation confirm is the primary function of the electrically operated…?

A

Aft outflow valve

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27
Q

The forward outflow safety valve main purpose?

A

Emergency operation or smoke removal from flight comp

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28
Q

What prevents an aircraft pressurising on ground?

A

Power lever angle less than 60 degrees means aft outflow valve is positioned fully open

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29
Q

When is landing elevation set?

A

Prior to take off

30
Q

Auto pre pressurisation does what?

A

During take off it Pressurises the cabin to 400ft below the elevation. This happens at 300ft per minute

31
Q

Pre pressurised mode remains after take off for how long? And why?

A

10 minutes to avoid the requirement to deselect the landing altitude in case of an aborted flight and emergency return to the departure airport

32
Q

Cabin pressure controller take over when?

A

Aircraft in flight for over 10mins and theoretical cabin alt is greater than scheduled cabin alt

33
Q

Rate of descent vs cabin?

A

AC descends 2300ft/min or less, cabin descends 300ft/min (normal)

AC descends >2300ft, cabin between 300ft and 1000ft

AC decent >3000ft, cabin rate will be 1000ft/min

34
Q

What does manual mode do?

A

Modulates the aft outflow valve

35
Q

Once in manual mode (MAN DIF) what does the DECR or INCR do?

A

DECR opens the outflow valve decreasing cabin differential pressure and increasing cabin alt

INCR close the outflow valve increasing cabin differential pressure and decreasing the cabin alt

36
Q

If aft outflow valve fails what is another way of pressurisation control?

A

Forward outflow safety valve.

Opening the valve (using the knob) decreases the cabin pressure and increases the cabin altitude

37
Q

Forward outflow safety valve can be finely adjusted by?

A

The overhead control panel

38
Q

Forward outflow safety valve can also be opened/ dumps the cabin pressure by?

A

FO side panel has guarded switch

39
Q

Selecting DUMP on the AUTO/MAN/DUMP switch does what?

A

Fully opens the aft outflow valve. Keeps the valve fully open allowing for maximum aft smoke removal

40
Q

Forward outflow knob can be used to remove smoke from flight deck without depressurising the cabin?

A

Yes! Keeping it in auto closes the aft outflow valve and using the FWD outflow knob allows smoke out through the forward safety outflow valve

41
Q

When aircraft is not pressurised what provides air?

A

Ram air through NACA vents on base of tail

42
Q

How to use Ram air ventilation?

A

MAN selection
MAN DIFF switch to INCR for 50 seconds
FWD safety valve opened by turning the knob
FWD safety valve selector to open under the guarded switch

This will fully close the aft outflow valve and open the forward safety valve

43
Q

CPC cabin pressure controller maintains cabin differential of?

A

5.46psi

44
Q

CPC maintain cabin alt of… when at 25,000ft

A

8000ft

45
Q

Max pressure differential?

A

5.8 +/- 0.15

46
Q

CABIN PRESS warning light

A

Cabin alt 9,800ft or more

47
Q

Max differential for taxi, takeoff and landing?

A

0.5psi

48
Q

Normal cabin differential?

A

5.46 +/- 0.1

49
Q

Max cabin differential?

A

5.95 psi

50
Q

To support an emergency return to the departure airport pre-pressurisation remains in effect for up to…

A

10 minutes after take-off

51
Q

Selecting the AUTO / MAN / DUMP switch to DUMP on the pressurisation control panel…

A

Fully opens the aft outflow valve

52
Q

If the aircraft lands with a pressurised cabin…

A

The cabin will climb at the programmed rate for 1 minute before dumping pressure

53
Q

Which of the following areas are not pressurised?

A

Forward equipment bay

54
Q

How many outflow valves are installed in the aircraft?

A

Three

55
Q

Safety outflow valves are installed to allow for…

A

Both positive and negative pressure relief

56
Q

The safety valves limit negative pressure and open at…

A

-0.5 PSI

57
Q

The CABIN PRESS warning light illuminates when cabin altitude exceeds…

A

9,800 ft

58
Q

The normal temperature range for the flight compartment is between…

A

15 and 27 degrees C

59
Q

The forward safety outflow valve…

A

All of the above
Provides a backup means of pressurisation control if the aft outflow valve fails
Operates independently of the cabin pressure controller
Can be used in an emergency to evacuate smoke from the flight compartment

60
Q

The air conditioning system installed consists of…

A

A single air conditioning pack with two air cycle machines

61
Q

The recirculation fan is located…

A

With the air conditioning pack

62
Q

The inlet and outlet vent valves in the aft baggage compartment…

A

Are controlled automatically

63
Q

When in the manual mode of pressurisation, operation of the MAN DIFF toggle switch…

A

Opens the aft outflow valve when selected to DECR

64
Q

The flight compartment pack shares what percentage of its airflow with the cabin?

A

50%

65
Q

In the automatic mode of pressurisation, outflow valve modulation starts when…

A

Power is applied for take-off

66
Q

With one air cycle machine (PACK) selected off…

A

The recirculation fan operates at low speed

67
Q

On the ground the aircraft does not pressurise because the AFT outflow valve is opened by…

A

The power levers being below 60 degrees PLA

68
Q

Setting one PACK switch to OFF on the air conditioning panel will result in…(what valve closing)

A

The associated turbine shutoff valve closing

69
Q

When a FLT COMPT DUCT HOT or CABIN DUCT HOT caution light illuminates…

A

The associated air cycle machine will shutdown automatically

70
Q

The air conditioning pack is located in the…

A

Aft equipment bay

71
Q

How many safety outflow valves are installed in the aircraft?

A

Two - located on the front pressure bulkhead and the rear pressure dome

72
Q

When operating with a single air cycle machine the airflow is approximately…

A

70% of dual ACM operation

Q400 (24 decks)

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