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AIRBUS A320 > PRESSURIZATION > Flashcards

PRESSURIZATION Flashcards

1
Q

When does the delta P indication become amber?

A

When delta P below 0.4 psi or over over 8.5 psi

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2
Q

What is the function of the ditching pb?

A

Closes the outflow valve
Closes emergency ram air inlet door
Closes avionics ventilation inlet and extract valves
Closes Pack Flow Control Valves

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3
Q

How many motors are available to operate the outflow valve?

A

Two automatic AC motors and one manual DC motor

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4
Q

Describe the different stages of pressurization during a normal flight?

A
  • Ground mode: Fully open outflow valve
  • Pre-press: With TO thrust set cabin pressurizes to 0.1 psi at 400
    ft/ min
  • Climb/cruise/descent: Normal pressurization at max 8.06 psi.
  • Depress: Weight on wheels signals to release pressure to 0.1
    psi at 500 ft/min
    Ground mode: 55 seconds after weight on wheels outflow valve
    is fully open again
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5
Q

What is the maximum cabin rate of descent in the descent?

A

750 ft/min

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6
Q

What systems feed information to the CPC (Cabin Pressurization Controller)?

A
  • FMGC: Field ldg elevation, QNH
  • ADIRS: Static pressure, baro correction
  • LGCIU: Landing Gear Control Interface Unit
  • EIU: Thrust lever angle for pre-press
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7
Q

Where is the outflow valve located?

A

Right aft fuselage

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8
Q

In what 3 modes can pressurization system operate in?

A
  • Automatic: Pressurization is controlled by the CPC:s
  • Semi-automatic: Landing elevation data from the FMGC is
    missing and elevation has to be set manually
  • Manual: Manual control of the MAN motor
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9
Q

What are the main components of the pressurization system?

A
  • Two CPC:s
  • One residual pressure controller (RPCU)
  • One outflow valve
  • One cabin control panel
  • Two safety valve
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10
Q

How do you manually switch between CPC:s?

A

Switching the MODE SEL pb to MAN for at least 10 seconds, then returning it to AUTO will select the other system

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11
Q

When does the cabin V/S indication on the ECAM CRUISE page start flashing?

A

When V/S is greater than 1750 ft/min and stops flashing when returning below 1650 ft/min

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12
Q

What is the purpose of the RPCU (Residual Pressure Control Unit)?

A

To depressurize the aircraft in case of abnormal residual pressure on the ground.

It opens the outflow valve when:
- Outflow valves are not fully open
- Both CPCs are failed

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13
Q

What is the function of the pressurization “Abort Mode” and what triggers it?

A

If the aircraft climb is less than normal below 8000 ft after take-off or descent is more then 200 fpm for 30 sec the Cabin pressure is set back to take-off pressure of 0.1 psi

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14
Q

When does the delta P indication turn amber?

A

Goes Amber less than 0.4 psi and more than 8.5 psi

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15
Q

What does it mean if the delta P digital display is pulsating on final approach?

A

You are below 800ft with a delta P of more than 1.5 psi

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16
Q

What does it mean if the digital display for the cabin V/S is pulsating?

A

V/S is more than 1750 ft/min

17
Q

When does the cabin altitude change to red?

A

At 9550 ft cabin altitude

18
Q

What does it mean if the cabin altitude readout is flashing?

A

Cabin altitude is over 8800 ft
Flashing stops when the cabin returns to below 8600 ft cabin alt

19
Q

When does the positive safety valve open?

A

Opens when the cabin delta P is between 8.9 and 9.7 psi
The range is due to the reduced accuracy of the delta P measurements (in MAN mode) combined with the decrease in cabin differential pressure that occurs immediately after the safety valves open

20
Q

When will the mask doors open when in AUTO mode?

A

At 14000 ft

21
Q

From what system does the pressurization system obtain landing elevation?

A

FMGC database

22
Q

What happens with the CPC:s after every landing?

A

They swap primary role between each other

23
Q

Will the DITCHING pb always close the outflow valve?

A

Not if the valve is under manual control

24
Q

If PACK FLOW switch is set to HI, will it automatically shift to lower flow?

A

No, only the opposite is true

25
Q

What happens at a cabin altitude of 11300 ft?

A

All cabin signs illuminate

26
Q

If the Lav/Galley Extract Fan fails, what happens with regards to cabin temperature control?

A

Cabin temperature defaults to a set value

27
Q

Approximately what rate of cabin change does one “click” of the MAN V/S CTL switch produce?

A

50 fpm

28
Q

How do you know which CPC is the active one?

A

SYS 1 or SYS 2 will be displayed on the AIR page

29
Q

What does a FAULT light in the Cabin Press Mode Selector pb switch indicate?

A

That both CPC:s have failed

30
Q

When do you have to manually set the landing elevation for the pressurization system?

A

Destination is not in data base or both FMGC:s fail

31
Q

In MAN mode, what is the target cabin V/S?

A

500 ft/min

32
Q

If the MAN V/S CTL is moved UP, what happens to Press Diff, Cabin V/S, Cabin Alt and Outflow Valve?

A

Outflow valve opens
Press diff decreases
Cabin V/S increases
Cabin Alt increases

33
Q

What is the purpose of the two safety valves in the pressurization system?

A

To act as positive and negative pressure relief valves at +8.9 psi and -1.0 psi respectively

34
Q

Where are the safety valves located?

A

In the rear pressure bulk head wall

35
Q

In what situation is the negative pressure safety valve likely to operate?

A

During descent if the Cabin altitude stays at 8000 ft and the aircraft descends below that. If that happens, the negative safety valve opens inwards to allow ambient air to come in and equalize the pressure

36
Q

Why would cabin alt increase slightly when a toilet is flushed?

A

Because over 16000ft the toilets uses differential pressure to flush. It’s like opening up a second outflow valve

37
Q

At what cabin altitude will the outflow valve close automatically?

A

15 000 ft cabin altitude

AIRBUS A320 (33 decks)

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