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Airbus 320 > Air Conditioning > Flashcards

Air Conditioning Flashcards

1
Q

How many air conditioning zones are there?

A

3

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2
Q

What is an ACSC and how many are installed?

A

Air Conditioning System Controller.

2 installed

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3
Q

What is controlled by the respective ACSC?

A

ACSC 1: Cockpit zone and pack 1

ACSC 2: 2 cabin zones and pack 2

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4
Q

What are the main components of the Pack?

A

Primary heat exchanger
Main heat exchanger
Air Cycle Machine

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5
Q

How are the heat exchangers in the packs cooled?

A

Ram air

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6
Q

How is temperature of the pack regulated?

A

Pack bypass valve modulates temp by adding hot air tapped upstream of compressor to the ACM turbine exhaust. Also regulated by modulating the ram air inlet flap.

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7
Q

When is the pack flow control valve automatically closed?

A
  • Low bleed pressure
  • Pack overheat
  • Engine start
  • Engine fire pushbutton
  • Ditching pushbutton
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8
Q

What are the possible inputs to the mixer units?

A
  • Conditioned air from packs
  • Recirculated cabin air from the cabin fans
  • LP ground connection conditioned air
  • Emergency ram air
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9
Q

How can the Hot Air PRV be controlled from the cockpit?

A

Using the HOT AIR pushbutton.

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10
Q

How is the Hot Air PRV controlled?

A

By ACSC 1

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11
Q

When will the Hot Air PRV close?

A
  • Duct overheat
  • Cockpit trim air valve fails
  • Both cabin trim air valves fail
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12
Q

When is the Ram Air flap closed?

A
  • When T/O power is set

- On landing when struts are compressed >70kts (opens after 20 seconds)

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13
Q

Which output temperature is produced by the packs?

A

Both pack will produce the lowest of the demanded temperatures.

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14
Q

When will the packs revert to high flow regardless of switch position?

A
  • APU supplying the packs

- Single pack operations

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15
Q

What happens in case of a seized ACM compressor or turbine?

A

Pack reverts to heat exchanger mode.

  • Uses primary heat exchanger only
  • Reduced pack flow
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16
Q

When does the pack flow control valve open again following engine start?

A

After 30(60 NEO)seconds provided:

  • Start valve closed
  • N2 > 50%
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17
Q

What is the significance of a Pack FAULT light?

A
  • Pack flow control valve disagree
  • Compressor outlet overheat
  • Pack outlet overheat
18
Q

Pressing the RAM AIR pushbutton, when will the ram air inlet open?

A

Opens if:

  • Ditching pushbutton OFF
  • Cabin pressure diff <1psi
19
Q

What cabin altitude will trigger EXCESS CABIN ALT ECAM?

A

> 9550’

20
Q

When will the safety valves open?

A

> 8,6 psi

< 1 psi

21
Q

How many motors drive the outflow valve?

A

3

22
Q

How many Cabin Pressure Controllers are there?

A

2

23
Q

What causes automatic changeover of CPC?

A
  • Failure

- 70 sec after each landing

24
Q

What happens when pressing the Ditching pushbutton?

A

Provided to pressurisation mode is AUTO:

  • Outflow valve closes
  • Avionics inlet/outlet valves close
  • Emergency ram air inlet closes
  • Pack flow control valve closes
25
Q

What happens to the pressurisation on T/O?

A

Pre-Pressurisation when T/L set for T/O:

- Cabin climbs at 400’/min to 0,1 psi

26
Q

When is the outflow valve opened and any residual pressure released?

A

55 seconds after landing

27
Q

What is the max cabin altitude and pressure during cruise?

A

Approximately 8000’ and 8,06psi

28
Q

Can the CPC be manually changed?

A

Yes. By selecting manual for 10 sec, then re-select auto.

29
Q

When are the batteries ventilated?

A

Only in flight

30
Q

How are the lavatories and galleys ventilated?

A

By an electric fan exhausting the air overboard

31
Q

When do the avionics ventilation fans run?

A

Continuously when power is available

32
Q

When would the Avionics Equipment Ventilation be in the open circuit mode?

A

On the ground with skin temp above threshold ( >9-12°C )

33
Q

When would the Avionics Equipment Ventilation be in the closed circuit mode?

A
  • On the ground with skin temp below threshold (<9-12°C)
  • T/L set for takeoff
  • In flight with skin temp below threshold ( <32-35°C )
34
Q

What is the main difference between closed circuit and open circuit?

A

In closed circuit, the skin heat exchanger is used.

- Inlet and exhaust valves are closed

35
Q

What happens when pressing OVRD in case of blower FAULT?

A
  • Closed circuit configuration
  • Blower stops
  • Air conditioning inlet valve opens
36
Q

How is smoke configuration set on the Avionics Equipment Ventilation system?

A

Pressing OVRD on both blower and extract fan pushbuttons

37
Q

What happens in smoke configuration?

A
  • Air conditioning inlet valve opens
  • Blower fan stops
  • All other valves close
  • Air exhausted overboard through small flap in exhaust valve.
38
Q

Which two pack temperatures are displayed on the ECAM bleed page?

A

Compressor outlet (lower) and Pack outlet (upper)

39
Q

Is there any change in operation with the failure of one lane on one ACSC?

A

No effect

40
Q

If both lanes fail on one ACSC, can the other ACSC take control of the affected pack?

A

No. Pack is lost.

41
Q

At what cabin altitude will the signs automatically illuminate?

A

11.300’

42
Q

What is the cabin pressure limit? (Max and min)

A

+ 9.0psi

- 1.0psi

Airbus 320 (15 decks)

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