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Operations manuals > 21. AC/ Press/Vent > Flashcards

21. AC/ Press/Vent Flashcards

1
Q

How many ACSC’s does the aircraft have?

A

2

Aircraft technical Dec 12

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2
Q

What is the function of the ACSCs?

A

To regulate the outlet temperature of their associated pack.

Aircraft technical Dec 12

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3
Q

What are the three zones for the air conditioning that can be independently controlled?

A

Cockpit
Forward cabin
Aft cabin

Aircraft technical Dec 12

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4
Q

How do the ACSCs control the cabin temperatures in the three zones?

A

By controlling the hot air regulating valve and trim air valves.

Aircraft technical Dec 12

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5
Q

How many lanes does each ACSC have?

A

2

Aircraft technical Dec 12

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6
Q

Which zone(s) and pack does ACSC1 control?

A

Pack 1 and the cockpit zone.

Aircraft technical Dec 12

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7
Q

Which pack and zone(s) does ACSC2 control?

A

Pack 2 and the cabin zones.

Aircraft technical Dec 12

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8
Q

How is the pack control valve operated and controlled?

A

Pneumatically operated
Electrically controlled

Aircraft technical Dec 12

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9
Q

What is the function of the Pack Flow Control Valve?

A

It regulates the airflow in accordance with signals received from the ACSC.

Aircraft technical Dec 12

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10
Q

What is keeping the Pack Flow Control Valve closed in the absence of air pressure?

A

A spring.

Aircraft technical Dec 12

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11
Q

When does the pack flow control valve automatically close?

A
  • operation of fire or ditching PBs
  • Pack overheating
  • Engine starting

Aircraft technical Dec 12

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12
Q

How is the pack inlet scoop controlled?

A

By the ACSC

Aircraft technical Dec 12

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13
Q

What does the pack inlet scoop do during take off and landing and why?

A

Closes to avoid ingestion of foreign matter.

Aircraft technical Dec 12

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14
Q

What is the bypass valve in the air conditioning system used for?

A

To adjust pack outlet temperature.

Aircraft technical Dec 12

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15
Q

How is cabin air being recirculated?

A

By recirculating fans.

Aircraft technical Dec 12

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16
Q

What is the function of the mixer unit?

A

It mixes cold fresh air from the packs with recirculated cabin air.

Aircraft technical Dec 12

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17
Q

What is the function of the Ram Air Inlet?

A

Ventilates the cockpit and cabin to remove smoke or when both packs fail.

Aircraft technical Dec 12

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18
Q

What happens to the outflow valve when the ram air PB is turned on?

A

Opens about 50%, provided it is under automatic control and P is less than 1PSI.

Aircraft technical Dec 12

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19
Q

How are the trim valves controlled?

A

Electrically by the ACSC.

Aircraft technical Dec 12

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20
Q

What are the four general functions of the cabin pressurization system?

A
  • Ground function
  • Pre-pressurization
  • Pressurization in flight
  • De-pressurization

Aircraft technical Dec 12

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21
Q

Which areas of the aircraft are pressurized?

A

Cockpit
Cabin
Avionics bay
Cargo compartments

Aircraft technical Dec 12

22
Q

What controls the cabin pressure?

A

2 independent digital Cabin Preddure Controllers

Aircraft technical Dec 12

23
Q

Where do the CPCs receive signals from?

A

ADIRS
FMGC
EIU
LGCIU

Aircraft technical Dec 12

24
Q

How many motors does the outflow valve have?

A

Three.

Aircraft technical Dec 12

25
Q

How many automatic motors for the outflow valve? And how controlled?

A

2 automatic motors
Controlled by associated CPC.

Aircraft technical Dec 12

26
Q

How many manual motors for the outflow valve and how controlled?

A

1 manual motor, driven by the backup section of CPC1.

Aircraft technical Dec 12

27
Q

What is the function of the pneumatic safety valves?

A

Prevent the cabin pressure from going too high (8.6PSI) or too low (1psi).

Aircraft technical Dec 12

28
Q

Where are the safety valves located?

A

On the rear pressure bulkhead.

Aircraft technical Dec 12

29
Q

When does an automatic transfer take place between CPCs?

A
  • 70seconds after each landing
  • if the operating system fails

Aircraft technical Dec 12

30
Q

In fully automatic control, what information does the CPC use?

A

Landing elev and QNH from FMGC

Pressure altitude from ADIRS

Aircraft technical Dec 12

31
Q

When does semi automatic control engage for the CPCs?

A

When no information is available from the FMGC (QNH and landing elev)

Aircraft technical Dec 12p

32
Q

What information doe the CPC use in semi automatic mode?

A

The CAPT baro reference from ADIRS and LDG ELEV manual selection.

Aircraft technical Dec 12

33
Q

What closes when pushing the ditching PB?

A

Outflow valve
Ram air inlet
Avionics ventilation in and extract valves
Pack flow control valves.

Aircraft technical Dec 12

34
Q

What is the function of the avionics ventilation system?

A

Cools electrical and electronic components in the avionics compartment and on the flight deck including instrument and circuit breaker panels.

Aircraft technical Dec 12

35
Q

What controls all valves and fans in the avionics ventilation system?

A

The AEVC

Aircraft technical Dec 12

36
Q

When is the avionics ventilation in the open loop?

A

On the ground only when skin temperature is above the on ground threshold.

Aircraft technical Dec 12

37
Q

What is the skin temperature on ground threshold?

A

+12 (temp increasing)
+9 (temp decreasing)

Aircraft technical Dec 12

38
Q

When do the skin inlet and extract valves close?

A

When skin temp is below on ground threshold.
When take off thrust is set

Aircraft technical Dec 12

39
Q

How are the batteries ventilated?

A

By Venturi.

Aircraft technical Dec 12

40
Q

How are the lavatories and galleys ventilated?

A

Extraction fan

Aircraft technical Dec 12

41
Q

If only one pack is selected on or the APU is supplying bleed air, what airflow will be delivered, regardless of setting?

A

HI FLOW.

42
Q

When do you get an ECAM warning of excessive cabin pressure?

A

> 9550ft

43
Q

What does a PACK FAULT ECAM message indicate?

A

The valve position disagrees with the selected position or the Valve is closed.

44
Q

When does a pack overheat occur?

A

Outlet temp >260C or >230C four times in one flight.

45
Q

When does a duct overheat occur?

A

88C or 80C four times in flight.

46
Q

What is the function of the mixing unit?

A

Mixes air that comes from the cabin and the packs.

47
Q

What is the function of the ram air inlet?

A

Can provide ambient air to the mixing unit in emergency.

48
Q

How is air supplied by the pneumatic system? (Which components)

A

2 pack flow control valves
2 packs
Mixing unit
Ram air inlet

49
Q

How is the temperature of air entering the cabin controlled?

A

Two Air Conditioning System Controllers (ACSC)

50
Q

Where do the trim air valves take the air from?

A

Tapped upstream of the packs.

51
Q

What is the function of the trim air valves?

A

Add hot air to the mixing unit.

Operations manuals (20 decks)

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