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Virgin America > AIR CONDITIONING PANEL > Flashcards

AIR CONDITIONING PANEL Flashcards

1
Q

The pneumatic system is monitored and controlled by?

A

2 Bleed Monitoring Computers (BMC)

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2
Q

If one BMC fails, can the other take over?

A

a. Yes, they are interconnected. If BMC 1 fails:
b. APU and ENG 1 leak detection are not monitored
c. ECAM APU BLEED LEAK warning is lost

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3
Q

The PACK FLOW selector has LO, NORM, and HI positions (A319/320). What does this allow us to do?

A

Select pack flow rates representing LO 80%, NORM 100%, and HIGH 120% of NORM

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4
Q

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

A

Hi

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5
Q

When should the PACK FLOW selector not be in the normal position?

A

a. Less than 115 guests, select LO
b. Hot and humid conditions, select HI
c. During Smoke/Fumes removal, select HI as per the procedure

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6
Q

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

A

Engine speed is automatically increased to provide adequate bleed air pressure

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7
Q

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

A

a. Overheat - Pack outlet
b. Overheat - Compressor outlet
c. Discontinuity - Switch position disagreement with pack flow control valve
d. Note: FAULT light will be illuminated when no bleed air is supplied

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8
Q

What does the amber FAULT light in the APU BLEED pushbutton indicate?

A

Bleed leak (APU bleed valve closes)

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9
Q

What causes the amber FAULT light on the ENG 1 BLEED and/or ENG 2 BLEED pushbutton (OOLD)?

A

a. Overpressure - Downstream of the bleed valve
b. Overheat
c. Leak - Low pressure
d. Discontinuity - APU bleed valve open and engine bleed valve not closed or
e. Engine Start with bleed valve not closed

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10
Q

What are the two functions of the engine bleed valves?

A

a. Pressure regulation

b. Shut off valves

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11
Q

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

A

1 PSI ΔP or less

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12
Q

What logic controls the X-Bleed valve when the X-BLEED switch is in AUTO?

A

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)

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13
Q

What causes the Pack Flow Control valve to automatically close?

A

a. Upstream pressure below minimum
b. Pack overheat
c. Engine start sequence
d. Engine FIRE pushbutton on the related side pressed
e. DITCHING pushbutton is selected

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14
Q

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

A

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

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15
Q

How many Air Conditioning System Controllers are there?

A
  1. Each Air Conditioning System Controller has 2 lanes – (Active/Standby)
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16
Q

Describe how the Air Conditioning System Controllers regulate temperature?

A

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

17
Q

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

A

The second lane takes over

18
Q

What occurs when both lanes of an Air Conditioning System Controller fails?

A

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

19
Q

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

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
b. 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

20
Q

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

A

The affected pack will operate as a heat exchanger

21
Q

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

A

The pack flow control valve will close automatically

22
Q

After engine start with the APU BLEED pushbutton ON, what source is supplying bleed air to the packs?

A

APU Bleed

23
Q

When does the Lav/Galley Extract Fan operate?

A

Continuously when electrical power is available

Virgin America (47 decks)

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