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A320 Knowledge > Air Conditioning DSC 21 > Flashcards

Air Conditioning DSC 21 Flashcards

1
Q

Air to the airconditioning system is supplied by the pneumatic system via…?

A
  • Two pack flow control valves
  • Two packs
  • The mixing unit
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2
Q

Where does the air come from which enters the mixing unit?

A

The cabin (recirc fans), and

The packs (cold fresh air), or
The RAM AIR inlet, or
Low pressure ground inlets

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3
Q

In an emergency where does Ram air provide ambient air to?

A

The mixing unit

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4
Q

Temperature regulation of the Flight Deck and Cabin is ensured by…..?

A

A Zone controller and 2 pack controllers (YUD), or

2 Air Conditioning System Controllers (ACSC
all except YUD)

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5
Q

How is temperature regulation optimised

A

By the hot air pressure regulating valve, and
the trim air valves
that add hot air, tapped upstream of the packs to the mixing unit

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6
Q

How much can the temperature be modified by the Cabin Crew from the Temperature Control Panel on the FAP?

A

+-2.5 deg C

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7
Q

What kind of air can be supplied to the mixing unit by a ground connection?

A

Low pressure air

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8
Q

Pack operation is controlled by…?

A

Signals coming from-
The Pack Controller (YUD), or
Air Conditioning System Controller (Others)

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9
Q

Warm air from the Precooler flows through the Pack Flow Control Valve and then flows….

A
  1. To the primary heat exchanger
  2. Air Cycle Machine’s compressor (↑ Pressure & Temp)
  3. Heat exchanger again
  4. ACM turbine (expands, drives compressor and cooling fan) and ↓temperature
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10
Q

When will the Pack Valve close automatically?

A
  • Pack Overheat (on the ground only)
  • Engine Start
  • Operation of FIRE or Ditching pb
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11
Q

What happens when the RAM AIR pb is selected ON?

A

Outflow valve opens about 50% provided:

  • its under automatic control, and
  • ∆P is <1 psi
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12
Q

When will the Hot-Air PRV close automatically?

A

If:

  • The duct overheats
  • Cockpit Trim air valve fails
  • Both Cabin trim air valves fail
  • Both lanes of ACSC 1 fail (all except YUD)
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13
Q

Does the Hot-air PRV remain operative if only one Cabin trim air valve fails?

A

Yes

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14
Q

How are the trim air valves controlled?

A 
Electrically via the:
Zone Controller (YUD), or
ACSC (all except YUD)
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15
Q

In all other aircraft except YUD, which ACSC controls which trim air valves?

A

Cockpit trim air valve is controlled by ACSC 1

Cabin trim air valves are controlled by ACSC 2

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16
Q

Which ACSC (all except YUD) regulates the Hot-air valve?

A

ACSC 1

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17
Q

Each pack controller /ACSC regulates the temperature of its associated pack by….?

A

Modulating the bypass valve and

The Ram air inlet flap

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18
Q

When do the Ram air inlet flaps close during take-off?

A

When TO power is set, and

the main landing gear struts are compressed

19
Q

When do the Ram air inlet flaps close during landing?

A

As soon as the main landing gear struts are compressed,

Speed >=70kts

20
Q

When do the Ram air inlet flaps open after landing?

A

20 sec after the speed drops <70kts

21
Q

The pack controllers /ACSC’s regulate flow by….?

A

Modulating the associated pack flow control valve

22
Q

When does the Pack Flow selector deliver higher flow than selected?

A
  • Single Pack operations

- When the APU is supplying bleed air

23
Q

When will the system deliver normal flow with the Pack Flow selector in LO

A

If the temperature demand cannot be satisfied

24
Q

What does the Zone Controller (YUD) / ACSC do if the cooling demand in one zone cannot be satisfied?

A

If the bleed pressure is too low, it
sends a pressure demand signal to both Engine Interface Units (EIU) to
increase the minimum idle and increase bleed pressure

25
Q

When APU bleed valve is open and a zone temperature demand cannot be satisfied what does the Zone Controller (YUD) /ACSC do?

A

Signals the APU’s Electronic Control Box (ECB) to increase APU flow output

26
Q

By what components is temperature regulation achieved?

A 
Zone Controller (YUD), or
ACSC
27
Q

Where are the actual temperatures measured?

a) For the cockpit?
b) For the Cabin?

A

a) In the cockpit

b) In the Lavatory extraction circuit and galley ventilation system

28
Q

Each Zone Controller (YUD) consists of….?

A

A primary Channel that is normally in control, and

a secondary channel that acts as a backup if the primary channel fails

29
Q

Each ACSC comprises…?

A

Two lanes.
One lane controls the system,
the other takes over full control in case of active lane failure

30
Q

What happens in the case of a Zone Controller (YUD) Primary Channel Failure?

A
  • secondary channel operates as backup
  • Flow setting and optimised temp not available
  • HOT AIR and TRIM AIR valves close
  • Zones controlled to 24°C
  • Pack1 controls cockpit
  • Pack 2 controls FWD/AFT cabin temp
  • ALTN MODE on ECAM COND page
31
Q

What happens in the case of a Zone Controller (YUD) Secondary Channel Failure?

A
  • No effect on temp regulation

- Backup mode lost

32
Q

What happens in the case of a Zone Controller (YUD) Primary and Secondary Channel Failure?

A
  • Optimised and backup temp regulation lost
  • Pack delivers fixed temp -20°C for Pack 1
  • 10°C for Pack 2
  • All ECAM COND info removed except green PACK REG
33
Q

Pack Controller (YUD)-Primary Channel Failure?

A
  • Secondary computer acts as a backup
  • Regulation not optimised
  • Pack flow is fixed at previous setting
34
Q

Pack Controller (YUD)-Secondary Channel Failure?

A
  • No effect on Pack regulation

- ECAM signals related to the corresponding pack are lost

35
Q

Pack Controller (YUD)-Primary and Secondary Channel Failure?

A

As a backup, corresponding pack outlet temp is controlled by the anti-ice valve, stabilised to a temp between 5°C -30°C in a max of 6mins

ECAM signals related to corresponding pack are lost

36
Q

Air Conditioning System Controller (ACSC) -One lane failure?

A

No effect.

The second lane takes over

37
Q

Air Conditioning System Controller (ACSC) -Both lanes failure?

A
  • Related pack is lost
  • Hot air PRV close
  • Trim Air valves close
38
Q

ACM failure -how is the pack operated?

A

In heat exchanger cooling mode.

Some air travels through the bypass valve and the rest through the failed ACM

39
Q

What effect does ACM seizure have on Pack flow?

A

It reduces pack flow

40
Q

Hot air PRV -Failed OPEN?

A

No effect

41
Q

Hot air PRV -Failed CLOSED?

A
  • Optimised regulation lost
  • Trim air valves driven to fully closed
  • Pack 1 controls cockpit temp to selected value
  • Pack 2 controls cabin temp (FWD/AFT) to mean value of selected temp
42
Q

Zone temp selector

a) 12 o’clock
b) cold
c) hot

A

a) 24
b) 18
c) 30

43
Q

HOT AIR pb OFF

A
  • valve closes
  • Trim air valves close
  • FAULT circuit reset
44
Q

HOT AIR pb FAULT light

A
  • Duct overheat
  • > =88°C
  • Valve and Trim air close
  • FAULT light goes out when temp <70°C AND then flight crew selects OFF

A320 Knowledge (40 decks)

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