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Week 2 type exam > Chapter 21 Air Conditioning > Flashcards

Chapter 21 Air Conditioning Flashcards

1
Q

HEPA filters remove contaminants to what level?

A

0.5 microns
Bacterial and microorganism level

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2
Q

In relation to equipment cooling, what prevents the FWD cargo from receiving exhaust air when the exhaust valve opens?

A

A check valve.

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3
Q

What is the purpose of the recirculation system?

A

It reuses cabin air for ventilation purposes, reducing the use of bleed air, making it more efficient.

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4
Q

What is the function of the equipment overboard exhaust valve?

A

It is open when the aircraft is on the ground, venting the hot air overboard.
When in the air, the valve is closed the hot air is used to heat the forward cargo compartment.

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5
Q

How many motors are associated with the outflow valve?

A

There are two AUTO motors and one MANUAL

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6
Q

What indication would you get if equipment cooling failed on the ground?

A

The amber OFF light followed by the GND call alarm after 20 seconds

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7
Q

What does the test of the Pack Zone Temperature Controller show?

A

It does a self test of the box and shows faults from the previous flight

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8
Q

What air source passes through the recirculation system?

A

Passenger Cabin Air

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9
Q

When would you be required to pull the C/B for the overboard exhaust valve?

A

If you were dispatching an aircraft for unpressurised flight

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10
Q

Where are the recirc fan overheat switches located?

A

In the fan’s field coils.

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11
Q

For the FWD door area supplementary heating system, which duct will supply air?

A

Flight compartment distribution duct.

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12
Q

In relation to the emergency exit doors, where are the door heater blankets located?

A

Behind the door lining and door trim.

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13
Q

What logic does the door area heating work off?

A

Air/Ground logic

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14
Q

With both packs operational, which pack supplies air to the flight compartment?

A

The L/H Pack.

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15
Q

How many pack temperature control valves are there?

A

4.

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16
Q

How many equipment cooling fans are there?

A

4
Two supply,
Two exhaust.

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17
Q

How is air ventilated from the toilets and galleys?

A

Using cabin differential pressure.

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18
Q

How would you supply bleed air if the APU is INOP and engines are off?

A

Using the air starter/ air conditioning unit 8 inch (massive) connection.

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19
Q

What could cause an increased noise level in the galley air conditioning supply duct?

A

Contamination in the muffler could cause an increased flow speed.

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20
Q

What is the main function of the trim air system?

A

It is used to regulate air temperature in cabin zones.

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21
Q

What controls the quantity of air that flows into the aircraft?

A

The Pack Flow Control System using the Pack Flow control valve.

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22
Q

What is the percentage of fresh air used for ventilation?

A

50%

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23
Q

In which mode will the OFF SCHED DESCENT light illuminate?

A

AUTO and ALTN

24
Q

How many cabin pressure relief valves are there?

A

There are two positive pressure relief valves and one negative pressure relief valve.

25
Q

During descent, a cargo fire is detected. What will the CPC do?

A

The CPC will increase the cabin pressure rate of change to a 750 slfpm
(Sea level)

26
Q

In relation to EQUIP cooling, what happens when the normal exhaust fan fails?

A

The OFF light illuminates and you get an OVERHEAD master caution.
You must then switch manually to the ALTN fan.

27
Q

What is the aural warning for a cabin altitude warning?

A

Intermittent beeping.
Same as T/O warning horn.

28
Q

During a potential emergency, how can the crew silence the cabin altitude warning?

A

By pressing the ALT HORN CUTOUT button.

29
Q

Where do you get the Cabin Altitude Red warning lights?

A

On the P1 and P3

30
Q

What are the parameters for activation of the cabin altitude switch?

A

9,000ft-11,000ft

31
Q

How many cabin pressure switches must be triggered in order to active a cabin altitude warning?

A

1

32
Q

What could be a possible cause of an EQUIP cooling OFF light?

A

The supply filter may be clogged on the R/H side in the FWD cargo compartment.

33
Q

What does the EQUIP OFF light actually indicate?

A

Low/No flow.

34
Q

If CPC 2 fails, what controls the MANUAL green light?

A

The Cabin pressure control module

35
Q

What controls the bleed air inside the primary heat exchanged?

A

The Ram Air inlet

36
Q

What controls the movement of the AFT SRADA?

A

The FWD SRADA

37
Q

What does SRADA stand for?

A

Smart Ram Air Door Actuator

38
Q

Where are the three thermal switches that detect an overtemp condition for cooling packs located?

A

The turbine inlet,
Compressor Discharge,
Pack discharge.

39
Q

If the pressurisation switch is in AUTO and the AUTOFAIL light illuminates in flight, what happens?

A

The GREEN ALTN light illuminates.

40
Q

What will happen if you try to preform a cabin pressure bite test if the aircraft is in Air Mode?

A

BITE aborted will be displayed on the display.

41
Q

What will happen if ice begins to form on the pack condenser?

A

The STBY TCV will open.

42
Q

What is the function of the water separator mix muff?

A

Mixes the warm air from the pack TCV with the cool air from ACM turbine.

43
Q

What happens if there is a blockage in the ram air water spray nozzle?

A

The water is discharged into the pack bay

44
Q

In the pack, which air supply does the secondary heat exchanger remove heat from?

A

The secondary heat exchanger removes heat from the compressor discharge

45
Q

What is the purpose of the pack check valve?

A

It permits the flow of ram air when the aircraft is on the ground.

46
Q

Where is the ozone converter located?

A

Upstream of the pack flow valve.

47
Q

At which point does the water vapour turn into water?

A

In the condenser.

48
Q

Pressure wise, what is the ventilation pressure relative to the cabin pressure?

A

It is greater than cabin pressure to induce flow.

49
Q

How many pack TCV’s are there?

A

4,
Two Norm,
Two STBY

50
Q

Where does the re-heater increase the temperature of the pack?

A

Before the turbine.

51
Q

What is the main difference with how the normal and STBY TCV’s are actuated?

A

Normal is electrically actuated,
STBY is pneumatically actuated.

52
Q

What does a ZONE TEMP light indicate?

A

An Overtemperature condition.

53
Q

What is the difference between balanced mode and unbalanced mode in relation to packs?

A

In balanced mode, both packs have the same output.

Unbalanced mode occurs when either, there is a failure or the trim air switch is in the off position.
During this, the right pack controls the cabin and the left pack controls the flight compartment

54
Q

The DUCT OVERHEAT light illuminates at?

A

190f

55
Q

What is the order of the BITE test switches on the PZTC?

A

BIT,
PREV FLIGHT,
VERIFY,
RESET.

Week 2 type exam (7 decks)

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