Q3 Can the pilot control the outflow valve?

Yes Select MAN on the MODE SEL Use the MAN V/S CTL switch [FCOM-DSC-21-20-30]

Aircon / Press / Ventilation Flashcards by Jay Hannan

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

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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Will the DITCHING pushbutton always close the outflow valve?

Not if the outflow valve is under manual control

[FCOM-DSC-21-20-40]

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Can the pilot control the outflow valve?

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

[FCOM-DSC-21-20-30]

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

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

[FCOM DSC-21-20-30]

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How do you manually switch controllers?

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

[FCOM-DSC-21-20-40]

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

Both automatic pressure controllers are faulty

[FCOM-DSC-21-20-40]

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

FMGC database

[FCOM-DSC-21-20-40]

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

Manually by selecting landing elevation via the LDG ELEV knob.

[FCOM-DSC-21-20-40]

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What protects the airframe from excessive cabin differential pressure?

2 pressure relief valves (safety valves)

[FCOM-DSC-21-20-20]

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Q10

How many outflow valve motors are installed?

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

[FCOM-DSC-21-20-20]

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Q11

How would a pilot manually control the pressurization?

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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Q12

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

[FCOM-DSC-21-10-50]

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Q13

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

Engine speed is automatically increased to provide adequate bleed pressure

[FCOM-DSC-21-20-30]

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Q14

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

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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Q15

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

1 PSI ∆P or less

[FCOM-DSC-21-10-20]

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Q16

What causes the Pack Flow Control Valve to automatically close?

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]

Q17

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

Duct overheat
- The Hot Air and Trim Air valves close automatically

[FCOM-DSC-21-10-50]

Q18

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

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

[FCOM-DSC-21-10-10]

Q19

Describe how the Air Conditioning System Controllers regulate temperature?

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]

Q20

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

The 2nd lane takes over

[FCOM-DSC-21-10-40]

Q21

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

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

[FCOM-DSC-21-10-40]

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?

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]

Q23

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

The affected pack will operate as a heat exchanger

[FCOM-DSC-21-20-40]

Q24

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

The pack flow control valve will close automatically

[FCOM-DSC-21-10-20]

# Q25 | VENTILATION PANEL What does the CARGO HEAT HOT AIR amber FAULT light indicate?

Duct overheat ## Footnote [FCOM-DSC-21-40-30]

# Q26 | VENTILATION PANEL What is the purpose of the CABIN FANS?

To re-circulate cabin air to the mixing chamber and then back to the cabin ## Footnote [FCOM-DSC-21-10-20]

# Q27 | VENTILATION PANEL With BLOWER and EXTRACT pushbuttons in AUTO how does the system operate?

* **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 ## Footnote [FCOM-DSC21-30-20, FCOM-DSC-21-30-60]

# Q28 | VENTILATION PANEL With both BLOWER and EXTRACT pushbuttons in OVRD (smoke configuration) what are the positions of the INLET and EXTRACT valves?

* INLET valve CLOSED * EXTRACT valve OPEN ## Footnote [FCOM-DSC-21-30-20]

# Q29 | VENTILATION PANEL What is the status of the Blower and Extract fans with the Blower and Extract valves in OVRD?

* BLOWER fan OFF * EXTRACT fan ON ## Footnote [FCOM-DSC-21-30-20]

# Q30 | VENTILATION PANEL When is air conditioning introduced into the avionics compartment?

* Abnormal operation * SMOKE configuration ## Footnote [FCOM-DSC-21-30-20]

# Q31 | VENTILATION PANEL Is the skin heat exchanger ever bypassed in flight?

Yes; during SMOKE configuration ## Footnote [FCOM-DSC-21-30-20]

# Q32 | VENTILATION PANEL What does an amber FAULT light on the BLOWER pushbutton indicate?

* **SMOKE** warning is activated * Computer power supply failure * Low blower pressure * Duct overheat ## Footnote [FCOM-DSC-21-30-60]

# Q33 | VENTILATION PANEL What does an amber FAULT light on the EXTRACT pushbutton indicate?

* **SMOKE** Warning is activated * Computer power supply failure * Low Extract pressure ## Footnote [FCOM-DSC-21-30-60]

# Q34 | VENTILATION PANEL With 2 FAULT lights on the VENTILATION panel, are there any other indications?

* Yes * The **SMOKE** light in the **GEN 1 LINE** pushbutton ## Footnote [FCOM-DSC-26-30-20]