Review Questions - Air Systems Flashcards
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)
Will the DITCHING pushbutton always close the outflow valve?
Not if the outflow valve is under manual control
Can the pilot control the outflow valve?
Yes, select MAN on the MODE SEL and use the MAN V/S CTL switch
How many controllers are in the pressurization system?
2 - only one is used at a time and they swap roles after each landing
How do you manually switch controllers?
Switch MODE SEL to MAN for 10 seconds, then back to AUTO
What does an amber FAULT light in the MODE SEL pushbutton indicate?
Both automatic pressure controllers are faulty
From what source does the pressurization system obtain landing elevation?
FMGC database
When the mode selector is out of the AUTO position, how do you set a landing elevation?
Manually by selecting landing elevation via the LDG ELEV dial
What protects the airframe from excessive cabin differential pressure?
2 pressure relief valves (safety valves)
How many outflow valve motors are installed?
3 - One for each CPC and one for manual control
What happens to the pack flow rate when APU bleed air is in use or during single pack operation?
Automatically goes to HI
When should the PACK FLOW selector not be in the normal position?
a. Select LO: A319/A320 less than 115 and A321 less than 140 customers
b. Select HI: Hot and humid conditions
c. During Smoke/Fumes removal, select HI as per the procedure
If the engine bleed air in-flight is too low what will occur?
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
Overheat - Pack outlet
Overheat - Compressor outlet
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?
1 PSI ΔP or less
What causes the Pack Flow Control valve to automatically close?
UPEED
Upstream pressure below minimum
Pack overheat
Engine start sequence
Engine FIRE push button on the related side pressed
DITCHING push button is selected
What does an amber FAULT light in the HOT AIR pushbutton indicate?
Duct overheat - the Hot Air and Trim Air valves close automatically
How many Air Conditioning System Controllers are there?
2 - Each Air Conditioning System Controller has 2 lanes -(Active/Standby)
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.
b. 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?
The second lane takes over
What occurs when both lanes of an Air Conditioning System Controller fail?
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?
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.
If an air cycle machine (ACM) fails, what occurs?
The affected pack will operate as a heat exchanger
What effect will the engine start sequence have on the pack flow control valves?
The pack flow control valve will close automatically
What logic controls the X-Bleed valve when the X-BLEED switch is in AUTO?
a. When APU bleed valve is OPEN, the X-Bleed valve is open
b. When APU bleed valve is CLOSED, the X-Bleed valve is closed
c. X-Bleed also CLOSES for wing, pylon, or APU duct leak (except during engine start)
