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A321 > Air Conditioning > Flashcards

Air Conditioning Flashcards

1
Q

Which computer controll the air conditioning system?

A

ACSC 1 and ACSC 2 (air conditioning system controller)
Each has 2 lane
One primary, one for backup
* ACSC 1 regulate cockpit temp
* ACSC 2 regulate both cabin temp

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2
Q

What occurs when an active lane of ACSC fails?

air conditioning system controller

A

The other one take over

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3
Q

When is air conditioning introduced into Avionic Compartment?

A

Abnormal operation and Smoke configuration

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4
Q

If an ACM fails, what occurs?

(air cycle machine)

A

The affected pack will operate as heat exchanger cooling mode

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5
Q

How pack regulate temperature?

A

ACSC modulating the bypass valve and ram air inlet flap (of heat exchanger)

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6
Q

When should PACK FLOW selecter set to LO?

A

All occupant <164

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7
Q

What effect will the engine starts sequence have on pack flow control valve?

A

Pack flow control valve closes

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8
Q

What cause pack flow control valve automatically close?

A
  • Upstream pressure below minimum
  • Engine start
  • Engine fire pb
  • Ditching pb
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9
Q

“Fault” light in PACK pbs indicate what?

(OOD)

A

(OOD)
●Over heat - pack outlet
●Over heat - compressor outlet
●Discontinuity- switch position disagree with pack flow control valve.

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10
Q

What happen if both lane of ACSC fail?

A

Related pack is lost and hot air pressure regulating valve and trim air valves close

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11
Q

When will hot air pressure regulating valve close?

A

●Both lane of ACSC 1 or 2 fail
●Duct overheat
●At least 2 trim air valves fail

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12
Q

How ACSC regulate temp?

A

●BASIC temp regulation: Both packs produce the required outlet temp determined by the lowest demanded zone temp.
●OPTIMISED temp regulation: Hot air is added to individual zones by trim air valves to maintain the desired temp.

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13
Q

“Fault” light in HOT AIR pb indicate?

A

Duct overheat when Temp reach 88⁰C
=> hot air valve and trim air valves auto close
“fault” light goes off when temp drop below 70⁰C

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14
Q

What is the function of HOT AIR pb

A

Control the hot air pressure regulating valves

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15
Q

When will pack ram air inlet flap close?

A

●During T/O when takeoff power is set and main landing gear pressed
●During land, when main gear is compressed.
Re-open 20s aft speed drop < 70kt

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16
Q

What does Emergency Ram Air inlet do?

A

Ventilate cabin during smoke or when both packs fail

17
Q

What is the function of mixture unit?

A

Through circulation fan,mix cabin air with conditioned air from packs

18
Q

Can cabin control the temp?

A

Yes, within +/- 2.5⁰C from cockpit modification

19
Q

What is temp selection range?

A

18⁰C to 30⁰C

20
Q

Under which condition, sys auto delivery HI flow?

A

In single pack operation
or when APU bleed is supply the system

21
Q

How is pack flow controlled and operated?

A

The valve is electrically controlled and pneumatically operated

22
Q

The PACK FLOW controller is set to NORM and ECAM show PACK FLOW to be high. WHY?

A

Because system is operated with only 1 pack or being supplied by APU bleed

23
Q

How can you operate the emergency ram air inlet valve?

A

The valve is controlled by the RAM AIR pb. It open provide that ∆P<1psi.

Note: Outflow valve need to be in auto position in order to be opened to ventilate the A/C

24
Q

If PACK FLOW is selected HI, will it automatically shift lower ?

A

No

25
Q

ECON FLOW pb

* ON
* OFF

A
  • ON: ECON flow is selected
  • OFF: normal flow is selected, 20% more than ECON
26
Q

Zone temperature selector sw:

* Cold
* Middle
* Hot

A
  • Cold: 18⁰C
  • Middle: 24⁰C
  • Hot: 30⁰C
27
Q

Temperature selector (CARGO HEAT panel)

* Cold
* Middle
* Hot

A
  • Cold: 5⁰C
  • Middle: 15⁰C
  • Hot: 26⁰C
28
Q

FWD ISOL VALVE pb (CARGO HEAT panel)
OFF
FAULT light

* Auto
* OFF
* FAULT light

A

**Auto: **
●The inlet and outlet isol
valves open
●The extraction fan run if
a/c on ground, or if
∆P≥1psi, the fan stop
●There is no smoke
detected
**OFF: **inlet and oulet valves close, trim air valve close, extraction fan stops
FAULT: with ECAM caution when either inlet or oulet valve not in selected position

A321 (25 decks)

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