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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
How many automatic motors for the outflow valve? And how controlled?
2 automatic motors Controlled by associated CPC. Aircraft technical Dec 12
26
How many manual motors for the outflow valve and how controlled?
1 manual motor, driven by the backup section of CPC1. Aircraft technical Dec 12
27
What is the function of the pneumatic safety valves?
Prevent the cabin pressure from going too high (8.6PSI) or too low (1psi). Aircraft technical Dec 12
28
Where are the safety valves located?
On the rear pressure bulkhead. Aircraft technical Dec 12
29
When does an automatic transfer take place between CPCs?
- 70seconds after each landing - if the operating system fails Aircraft technical Dec 12
30
In fully automatic control, what information does the CPC use?
Landing elev and QNH from FMGC Pressure altitude from ADIRS Aircraft technical Dec 12
31
When does semi automatic control engage for the CPCs?
When no information is available from the FMGC (QNH and landing elev) Aircraft technical Dec 12p
32
What information doe the CPC use in semi automatic mode?
The CAPT baro reference from ADIRS and LDG ELEV manual selection. Aircraft technical Dec 12
33
What closes when pushing the ditching PB?
Outflow valve Ram air inlet Avionics ventilation in and extract valves Pack flow control valves. Aircraft technical Dec 12
34
What is the function of the avionics ventilation system?
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
What controls all valves and fans in the avionics ventilation system?
The AEVC Aircraft technical Dec 12
36
When is the avionics ventilation in the open loop?
On the ground only when skin temperature is above the on ground threshold. Aircraft technical Dec 12
37
What is the skin temperature on ground threshold?
+12 (temp increasing) +9 (temp decreasing) Aircraft technical Dec 12
38
When do the skin inlet and extract valves close?
When skin temp is below on ground threshold. When take off thrust is set Aircraft technical Dec 12
39
How are the batteries ventilated?
By Venturi. Aircraft technical Dec 12
40
How are the lavatories and galleys ventilated?
Extraction fan Aircraft technical Dec 12
41
If only one pack is selected on or the APU is supplying bleed air, what airflow will be delivered, regardless of setting?
HI FLOW.
42
When do you get an ECAM warning of excessive cabin pressure?
>9550ft
43
What does a PACK FAULT ECAM message indicate?
The valve position disagrees with the selected position or the Valve is closed.
44
When does a pack overheat occur?
Outlet temp >260C or >230C four times in one flight.
45
When does a duct overheat occur?
88C or 80C four times in flight.
46
What is the function of the mixing unit?
Mixes air that comes from the cabin and the packs.
47
What is the function of the ram air inlet?
Can provide ambient air to the mixing unit in emergency.
48
How is air supplied by the pneumatic system? (Which components)
2 pack flow control valves 2 packs Mixing unit Ram air inlet
49
How is the temperature of air entering the cabin controlled?
Two Air Conditioning System Controllers (ACSC)
50
Where do the trim air valves take the air from?
Tapped upstream of the packs.
51
What is the function of the trim air valves?
Add hot air to the mixing unit.

Operations manuals (20 decks)

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