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Allegiant A320 Systems (2024) > Aircon / Press / Ventilation > Flashcards

Aircon / Press / Ventilation Flashcards

1
Q

Q1

Which valves will receive a close command when the DITCHING pushbutton is depressed (ARPO)?

A
  • Avionics Inlet and Extract valves
  • Ram air inlet
  • Pack Flow Control valves
  • Outflow valve (only if in AUTO mode)
  • FWD cargo outlet isolation valve

[FCOM-DSC-21-20-30]

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2
Q

Q2

Will the DITCHING pushbutton always close the outflow valve?

A

Not if the outflow valve is under manual control

[FCOM-DSC-21-20-40]

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3
Q

Q3

Can the pilot control the outflow valve?

A
  • Yes
  • Select MAN on the MODE SEL
  • Use the MAN V/S CTL switch

[FCOM-DSC-21-20-30]

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4
Q

Q4

How many Cabin Pressurization Controllers (CPCs) are in the pressurization system?

A
  • 2
  • Only one is used at a time and they swap roles after each landing

[FCOM DSC-21-20-30]

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5
Q

Q5

How do you manually switch controllers?

A

Switch MODE SEL to MAN for 10 seconds, then back to AUTO

[FCOM-DSC-21-20-40]

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6
Q

Q6

What does an amber FAULT light in the MODE SEL pushbutton indicate?

A

Both automatic pressure controllers are faulty

[FCOM-DSC-21-20-40]

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7
Q

Q7

From what source does the pressurization system normally obtain landing elevation?

A

FMGC database

[FCOM-DSC-21-20-40]

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8
Q

Q8

If the FMGC database does not supply the landing elevation, how do you set the landing elevation?

A

Manually by selecting landing elevation via the LDG ELEV knob.

[FCOM-DSC-21-20-40]

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9
Q

Q9

What protects the airframe from excessive cabin differential pressure?

A

2 pressure relief valves (safety valves)

[FCOM-DSC-21-20-20]

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10
Q

Q10

How many outflow valve motors are installed?

A
  • 3 Total
  • One for each CPC, and one for manual control

[FCOM-DSC-21-20-20]

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11
Q

Q11

How would a pilot manually control the pressurization?

A

By selecting MAN on the MODE SEL pb and utilizing the MAN v/s CTL toggle switch

[FCOM-DSC-21-20-10]

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12
Q

Q12

What flow rate is automatically selected when APU bleed air is in use or during single pack operation?

A

HI

[FCOM-DSC-21-10-50]

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13
Q

Q13

If the engine bleed air in-flight is too low, what will occur?

A

Engine speed is automatically increased to provide adequate bleed pressure

[FCOM-DSC-21-20-30]

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14
Q

Q14

What would cause an amber FAULT light to illuminate in the PACK 1 and/or PACK 2 pb (OOD)?

A
  • Overheat at PACK outlet
  • Overheat at Compressor outlet
  • Discontinuity in switch position vs. pack flow control valve position
  • NOTE: FAULT light will illuminate when no bleed air is supplied

[FCOM-DSC-21-10-50]

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15
Q

Q15

At what cabin differential pressure does the RAM AIR valve open?

A

1 PSI ∆P or less

[FCOM-DSC-21-10-20]

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16
Q

Q16

What causes the Pack Flow Control Valve to automatically close?

A
  • Upstream pressure below minimum
  • Pack overheat
  • Engine start sequence
  • Engine FIRE pb on the related side pressed
  • DITCHING pb is selected

[FCOM-DSC-21-10-50]

17
Q

Q17

What does an amber FAULT light in the HOT AIR pb indicate?

A
  • Duct overheat
    • The Hot Air and Trim Air valves close automatically

[FCOM-DSC-21-10-50]

18
Q

Q18

How many Air Conditioning System Controllers are there & how many lanes do they have?

A
  • 2 Air Conditioning System Controllers
    • Each Air Conditioning System Controller has 2 lanes (Active/Standby)

[FCOM-DSC-21-10-10]

19
Q

Q19

Describe how the Air Conditioning System Controllers regulate temperature?

A
  • Basic temperature regulation
    • Both packs produce the required outlet temperature determined by the lowest demanded zone temperature
  • Optimized temperature regulation
    • Hot air is added to the individual zones by the trim air valves to maintain the desired zone temperature

[FCOM-DSC-21-10-30]

20
Q

Q20

What occurs when an active lane of an Air Conditioning System Controller fails?

A

The 2nd lane takes over

[FCOM-DSC-21-10-40]

21
Q

Q21

What occurs when both lanes of an Air Conditioning System Controller (ACSC) fail?

A
  • The related pack is lost
  • The hot air pressure regulating valve and associated trim air valve(s) close

[FCOM-DSC-21-10-40]

22
Q

Q22

How does the Air Conditioning System Controller configure its associated pack ram air inlet flap for takeoff and landing to avoid the ingestion of foreign matter?

A
  • Takeoff: Pack Ram Air Inlet Flap closes when takeoff power is set and the main landing gear struts are compressed. Reopens after main landing gear strut extension
  • Landing: Pack Ram Air Inlet Flap closes as soon as the main landing gear struts are compressed and speed ≥ 70 knots. Opens 20 seconds after speed < 70 knots

[FCOM-DSC-21-10-30]

23
Q

Q23

If an air cycle machine (ACM) fails, what occurs?

A

The affected pack will operate as a heat exchanger

[FCOM-DSC-21-20-40]

24
Q

Q24

What effect will the engine start sequence have on the pack flow control valves?

A

The pack flow control valve will close automatically

[FCOM-DSC-21-10-20]

25
Q

Q25 | VENTILATION PANEL

What does the CARGO HEAT HOT AIR amber FAULT light indicate?

A

Duct overheat

[FCOM-DSC-21-40-30]

26
Q

Q26 | VENTILATION PANEL

What is the purpose of the CABIN FANS?

A

To re-circulate cabin air to the mixing chamber and then back to the cabin

[FCOM-DSC-21-10-20]

27
Q

Q27 | VENTILATION PANEL

With BLOWER and EXTRACT pushbuttons in AUTO how does the system operate?

A
  • Ground – system is normally in the OPEN configuration
  • Flight – system is normally in the CLOSED configuration
  • Intermediate – Closed configuration except small internal flap in Extract Valve is open

[FCOM-DSC21-30-20, FCOM-DSC-21-30-60]

28
Q

Q28 | VENTILATION PANEL

With both BLOWER and EXTRACT pushbuttons in OVRD (smoke configuration) what are the positions of the INLET and EXTRACT valves?

A
  • INLET valve CLOSED
  • EXTRACT valve OPEN

[FCOM-DSC-21-30-20]

29
Q

Q29 | VENTILATION PANEL

What is the status of the Blower and Extract fans with the Blower and Extract valves in OVRD?

A
  • BLOWER fan OFF
  • EXTRACT fan ON

[FCOM-DSC-21-30-20]

30
Q

Q30 | VENTILATION PANEL

When is air conditioning introduced into the avionics compartment?

A
  • Abnormal operation
  • SMOKE configuration

[FCOM-DSC-21-30-20]

31
Q

Q31 | VENTILATION PANEL

Is the skin heat exchanger ever bypassed in flight?

A

Yes; during SMOKE configuration

[FCOM-DSC-21-30-20]

32
Q

Q32 | VENTILATION PANEL

What does an amber FAULT light on the BLOWER pushbutton indicate?

A
  • SMOKE warning is activated
  • Computer power supply failure
  • Low blower pressure
  • Duct overheat

[FCOM-DSC-21-30-60]

33
Q

Q33 | VENTILATION PANEL

What does an amber FAULT light on the EXTRACT pushbutton indicate?

A
  • SMOKE Warning is activated
  • Computer power supply failure
  • Low Extract pressure

[FCOM-DSC-21-30-60]

34
Q

Q34 | VENTILATION PANEL

With 2 FAULT lights on the VENTILATION panel, are there any other indications?

A
  • Yes
  • The SMOKE light in the GEN 1 LINE pushbutton

[FCOM-DSC-26-30-20]

Allegiant A320 Systems (2024) (18 decks)

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