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Airbus > Pneumatics, Air Con & Pressurisation > Flashcards

Pneumatics, Air Con & Pressurisation Flashcards

1
Q

What are the three sources of high pressure air?

A
  • Engine bleed systems
  • APU load compressor
  • HP ground connection
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2
Q

What is the BMC?

A

Bleed Monitoring Computer, one for each engine

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3
Q

What happens if one BMC fails?

A

The other can take over most of the monitoring functions

You will not get a leak indication, therefore the fault light will not illuminate and it will not close automatically on the failed side

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4
Q

How are the bleed valves controlled?

A

pneumatically operated and electrically controlled by its associated BMC

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5
Q

Where does engine bleed air come from?

A
  • 5th stage - intermediate pressure stage
  • 9th stage - high pressure

of the engine’s high pressure compressor

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6
Q

What happens to the IP if the HP valve is open?

A

There is a check valve that closes to prevent air going back to the IP stage

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7
Q

What is the approximate precooler temperature?

A

200 degrees

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8
Q

When will the HP valve close automatically?

A

pneumatically:
- in case of low upstream pressure
- in case of excessive upstream pressure

electrically
- when the bleed valve is closed electrically

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9
Q

When will the bleed valve fully close?

A

pneumatically:
- if the upstream pressure falls below 8 psi
- if there is no return flow

electrically by means of:
- BLEED pb switch
- ENG FIRE pb switch
- BMC in case of overtemp, overpressure, leak, open starter valve, engine shutdown, APU bleed on

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10
Q

When will the overpressure valve close if pressure regulation fails?

A

When the pressure goes over 75 psi

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11
Q

When will the APU bleed valve automatically close?

A
  • APU leak
  • left wing leak
  • pylon 1 leak

except during engine start

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12
Q

When will the BMC force the crossbleed valve to close?

A

In case of overheat in any of the loops, except during an engine start

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13
Q

What happens if the air in the precooler gets too cold with wing anti-ice on?

A

You will get a warning and the temp may not be high enough for wing anti ice

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14
Q

When will the crossfeed valve automatically open and close? (if in automatic)

A

It will open when the APU bleed valve is open and the system uses APU bleed air

It will close if the system detects an air leak (except during engine start)

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15
Q

When will the engine ident number turn amber on the ECAM page?

A

When the engine goes below idle

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16
Q

What controls the packs?

A

Air Conditioning System Controller (ACSC) which have two lanes for each pack - if you lose both lanes then you lose the pack

Packs work independently of eachother

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17
Q

How are the pack flow control valves operated?

A

pneumatically operated and electrically controlled

they will close automatically in case of:
- pack overheat (on ground only)
- engine start
- operation of ditching pb
- operation of fire pb

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18
Q

When will the (emergency) ram air inlet open?

A
  • pressure is less than 1 psi
  • outflow valve is open about 50%
  • below 10,000 ft
  • ditching pb has NOT been pressed
19
Q

What is the hot air pressure regulating valve and when will it close automatically?

A

regulate the pressure of the hot air trapped upstream of the packs

it will close if:
- both lanes of the ACSC 1 or ACSC 2 fail
- the duct overheats
- at least two trim air valves fail

20
Q

Which ACSC (Air Conditioning System Controller) controls the trim air valves?

A

ACSC 1 controls the cockpit trim air valve

ACSC 2 controls the cabin trim air valves

Trim air valves adjust the temperature by adding hot air

21
Q

Where are the temperature sensors?

A
  • cockpit
  • lavatory extraction circuit
  • galley ventilation system
22
Q

What is the temperature selections range?

A

18 to 30 degrees

24 degrees is the midpoint

23
Q

What happens to the ram air inlet valve during take off and landing?

A

Take off - It closes when take off power is set

Landing - closes as soon as the main landing gear struts are compressed (above 70 kt)

to avoid the ingestion of FOD

24
Q

When will the pack flow automatically go to high?

A

High supplies 120%

  • single pack operation
  • when the APU is supplying bleed air
25
Q

What does the pressurisation system consist of?

A
  • Two cabin pressure controllers (CPC)
  • One residual pressure control unit (RPCU)
  • one outflow valve with an actuator that incorporates three motors - two automatic, one manual
  • one control panel
  • two safety valves
26
Q

What happens if FMGS data is not available for automatic pressurisation?

A

The crew inputs the landing field elevation

27
Q

What is normal operation for the CPCs?

A

One is active and one is standby and they communicate with eachother

28
Q

What are the pressurisation limits?

A

8.6 psi to 1 psi below ambient

29
Q

When will the RCPU (Residual Pressure Control Unit) automatically open the outflow valve?

A
  • the outflow valve is not fully open
    AND
  • both CPCs are failed or manual mode is selected
    AND
  • the aircraft is on the ground
    AND
  • all engines are shut down or all ADIRS indicate an airspeed below 100 kt
30
Q

What happens to pressurisation on the ground?

A
  • before take off and 55s after landing the outflow valve fully opens to ensure no residual cabin pressure
  • after landing pressure released at cabin vertical speed of 500 ft/min
31
Q

What is pre-pressurisation?

A

at take off the controller pre-pressurises at a rate of 400 ft/min until differential reaches 0.1 psi, to avoid a surge at rotation

32
Q

Max cabin rate of descent?

A

750 ft/min

33
Q

What happens to pressurisation in abort mode?

A

Prevents the cabin altitude from climbing in case there is no climb after take off

set back to the take off altitude +0.1 psi

34
Q

What closes during ditching?

A
  • outflow valve
  • emergency ram air inlet
  • avionics ventilation inlet
  • extract valves
  • pack flow control valves
35
Q

What areas are ventilated?

A
  • avionics, controlled by the Avionics Equipment Ventilation Controller (AEVC)
  • the batteries
  • the lavatories and galleys
36
Q

What is the open circuit configuration?

A
  • on the ground
  • operates when skin temp is above on-ground threshold
37
Q

What is the closed circuit configuration?

A
  • operates when the skin temperature is beneath the on-ground/in-flight threshold
  • closes the outlets and opens valves
38
Q

What is the intermediate configuration?

A
  • operates when the skin temperature is above the in-flight threshold
  • hotter air is discharged overboard
39
Q

How are the batteries ventilated?

A

A venturi in the skin of the aircraft

40
Q

When is rain repellent used?

A

It is not used - it has been deactivated

41
Q

Where are the controls for manual cabin air?

A

On the CABIN PRESS control panel

42
Q

What do the pneumatic safety valves do?

A

They prevent too high and too low pressure

43
Q

What critical areas is hot air used for anti-ice?

A

three outboard leading edge slats and the engine air intakes

Airbus (14 decks)

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