Supplement: Air Conditioning / Press / Ventilation Flashcards
Which valves will receive a close command when the DITCHING pushbutton is depressed (CARPO)?
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º FWD cargo outlet isolation valve º Avionics Inlet and Extract valves º Ram air inlet º Pack Flow Control valves º Outflow valve (only if in AUTO mode)
Will the DITCHING pushbutton always close the outflow valve? FCOM-DSC-21-20-40
Not if the outflow valve is under manual control
Can the pilot control the outflow valve?
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Yes, select MAN on the MODE SEL and use the MAN V/S CTL switch
How many auto controllers are in the pressurization system?
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2, only one is used at a time and they swap roles after each landing
How do you manually switch controllers?
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Switch MODE SEL to MAN for 10 seconds, then back to AUTO
What does an amber FAULT light in the MODE SEL pushbutton indicate?
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Both automatic pressure controllers are faulty
From what source does the pressurization system normally obtain landing elevation?
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FMGC database
If the FMGC database does not supply the landing elevation, how do you set the landing elevation?
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Manually by selecting landing elevation via the LDG ELEV knob.
What protects the airframe from excessive cabin differential pressure?
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2 pressure relief valves (safety valves)
How many outflow valve motors are installed?
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3 total. One for each CPC, and one for manual control
How would a pilot manually control the pressurization?
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By selecting MAN on the MODE SEL pb and utilizing the MAN v/s CTL toggle switch.
What flow rate is automatically selected when APU bleed air is in use or during single pack operation?
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HI
If the engine bleed air in-flight is too low what will occur?
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Engine speed is automatically increased to provide adequate bleed air pressure
What would cause an amber FAULT light to illuminate in the PACK 1 and/or Pack 2 pushbutton (OOD)?
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º Overheat - Pack outlet
º Overheat - Compressor outlet
º Discontinuity - Switch position disagreement with pack flow control valve
Note: FAULT light will be illuminated when no bleed air is supplied
At what cabin differential pressure does the RAM AIR valve open?
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1 PSI ΔP or less
What causes the Pack Flow Control valve to automatically close?
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º Upstream pressure below minimum º Pack overheat º Engine start sequence º Engine FIRE pushbutton on the related side pressed º DITCHING pushbutton is selected
What does an amber FAULT light in the HOT AIR pushbutton indicate?
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Duct overheat - the Hot Air and Trim Air valves close automatically
How many Air Conditioning System Controllers are there & how many lanes do they have?
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º 2 Air Conditioning System Controllers
º Each Air Conditioning System Controller has 2 lanes – (Active/Standby)
Describe how the Air Conditioning System Controllers regulate temperature?
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º Basic temperature regulation: Both packs produce the required outlet temperature determined by
the lowest demanded zone temperature
º Optimized temperature regulation: Hot air is added to the individual zones by the trim air valves to
maintain the desired zone temperatures
What occurs when an active lane of an Air Conditioning System Controller fails?
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The second lane takes over
What occurs when both lanes of an Air Conditioning System Controller (ACSC) fail?
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The related pack is lost. The hot air pressure regulating valve and associated trim air valve(s) close
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?
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º 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
º 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
If an air cycle machine (ACM) fails, what occurs?
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The affected pack will operate as a heat exchanger
What effect will the engine start sequence have on the pack flow control valves?
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The pack flow control valve will close automatically
