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Airbus A320 Family Systems > 2.000 AIR SYSTEMS > Flashcards

2.000 AIR SYSTEMS Flashcards

1
Q
  1. Which valves will receive a close command when the DITCHING pushbutton is depressed?
A

(ARPO) The operating CPC sends a “close” signal to close;
Avionics ventilation inlet and outlet (extract) valves
Ram air inlet (emergency)
Pack flow control valves
Outflow Valve
all of which are located below the aircraft floatation line.

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2
Q
  1. Will the DITCHING pushbutton always close the outflow valve?
A

No, the Outflow Valve will close only when the pressurization system is in automatic mode. It will not close automatically if it is under manual control.

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3
Q
  1. Can the pilot control the outflow valve?
A

Yes, if both automatic systems fail, the Flight Crew may use the CABIN PRESS control panel to take over manual control of cabin pressurization.
• Release the MODE SEL pushbutton to select MAN, and
• Push the MAN V/S CTL switch UP or DN to increase or decrease cabin altitude
The first of these actions cuts off power to the AUTO motors and enables the MAN motor to control the outflow valve.

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4
Q
  1. How many controllers are in the pressurization system?
A

Two identical, independent, digital cabin pressure controllers (CPCs) automatically control the system by maintaining the proper cabin pressure.

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5
Q
  1. How do you manually switch controllers?
A

Selecting the MODE SEL pb to MAN for at least 10 seconds, then returning it to AUTO allows switching between the two CPC Systems.

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6
Q
  1. What does an amber FAULT light in the MODE SEL pushbutton indicate?
A

This will appear in amber along with the related ECAM caution when both automatic systems are faulty

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7
Q
  1. From what source does the pressurization system obtain landing elevation?
A

Normally from the FMGC
If FMGC data are not available, the controller uses the LDG ELEV selected from the CABIN PRESS panel.

Air pressure in the cabin follows external schedules that the system receives as signals from the Flight Management and Guidance System (FMGS).
The controller normally uses the landing elevation and the QNH from the FMGC and the pressure altitude from ADIRS. If FMGC data are not available, the controller uses the captain BARO reference from the ADIRS and the LDG ELEV selected from the CABIN PRESS panel.

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8
Q
  1. When the mode selector is out of the AUTO position, how do you set a landing elevation?
A

When FMGS data is not available for automatic pressurization, the crew only needs to select the landing field elevation. In this semi-automatic mode, the pressurization system uses the manually-selected landing field elevation for internal schedules.

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9
Q
  1. What protects the airframe from excessive cabin differential pressure?
A

Two independent pneumatic safety valves prevent cabin pressure from going too high (8.6 psi above ambient) or too low (1 psi below ambient) to protect the airframe from excessive cabin differential pressure.

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10
Q
  1. How many outflow valve motors are installed?
A

3; two for automatic operation, one for manual operation. They control an actuator that incorporates the three motors to operate one outflow valve.

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11
Q
  1. What happens to the pack flow rate when APU bleed air is in use or during single pack operation?
A

Whatever the crew selects, the system delivers a higher flow for any of the following circumstances:
• In single-pack operation,
• When the APU is supplying bleed air
The system delivers normal flow if the Flight Crew selects LO flow and the temperature demand cannot be satisfied.

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12
Q
  1. When should the PACK FLOW selector not be in the normal position?
A

LO should be selected with less than 115 passengers onboard for fuel savings. The HI position can be selected for hot and humid conditions or as directed for smoke ventilation.
LO: 80% flow for less than 115 passengers
NORM: 100% flow
HI: 120% flow for high demand conditions

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13
Q
  1. If the engine bleed air in-flight is too low what will occur?
A

When the cooling demand in one zone cannot be satisfied due to low bleed pressure, the air conditioning system controller sends a pressure demand signal to both Engine Interface Units (EIU) to increase the minimum idle and to raise the bleed pressure.

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14
Q
  1. What would cause an amber FAULT light to illuminate in the PACK 1 and/ or Pack 2 pushbutton?
A

The FAULT light comes on amber, and a caution appears on the ECAM, if the pack flow control valve position disagrees with the selected position, or in the case of compressor outlet overheat or pack outlet overheat. (OOD)

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15
Q
  1. At what cabin differential pressure does the RAM AIR valve open?
A

When differential pressure is < 1 psi

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16
Q
  1. What causes the Pack Flow Control valve to automatically close?
A 
(LEADCoo)
The pack valve will close for the following:
1. Low bleed pressure
2. Engine start sequence
3. Associated FIRE pb is pressed
4. DITCHING pb is selected ON
5. Compressor outlet overheat
17
Q
  1. What does an amber FAULT light in the HOT AIR pushbutton indicate?
A

A duct overheat is detected. The FAULT light comes on amber, along with an associated ECAM caution, when a duct temp of 190°F (88°C) is detected. The HOT AIR valve and trim air valves all close automatically.

18
Q
  1. How many Air Conditioning System Controllers are there?
A

2

19
Q
  1. Describe how the Air Conditioning System Controllers regulate temperature?
A

The ACSC computes a temperature demand using the selected temperature and the actual temperature. The selected temperatures from the Flight Deck may then be fine-tuned for each cabin zone through the temperature control panel installed on the Flight Attendant Panel. The actual temperature is measured by sensors:
• in the Flight Deck, for the cockpit zone
• in the lavatory extraction circuit and galley ventilation system, for the cabin
A signal corresponding to the lowest demanded zone temperature goes to the ACSC, which then make both packs supply the required outlet temperature.
The ACSC optimizes temperature by acting on the trim air valves.

20
Q
  1. What occurs when an active lane of an Air Conditioning System Controller fails?
A

One Lane Failure

No effect, as the second lane takes over

21
Q
  1. What occurs when both lanes of an Air Conditioning System Controller fail?
A

The related pack is lost, and the hot air pressure-regulating valve and associated trim air valves close.

22
Q
  1. 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

The ram air inlet flap closes during takeoff and landing to avoid the ingestion of foreign matter.
During takeoff, the ram air inlet flap closes when takeoff power is set, and the main landing gear struts are compressed. During landing, it closes as soon as the main landing gear struts are compressed, as long as speed is at or above 70 kts. It opens 20 seconds after the speed drops below 70 kts.

23
Q
  1. If an air cycle machine (ACM) fails, what occurs?
A

If the Air Cycle Machine (ACM) fails (compressor/turbine seizure), the affected pack may be operated in heat exchanger cooling mode.

24
Q
  1. What effect will the engine start sequence have on the pack flow control valves?
A

Engine start sequence will have the following effect:
If the crossbleed valve is closed, the valve located on the starting engine side immediately closes when the MODE selector is set to IGN (or CRK). It remains closed on the starting engine side (provided the crossbleed valve is closed) when:
• The MASTER sw is set to ON (or MAN START pb set to ON)
• The start valve is open
• N2 < 50%
NOTE: If the crossbleed valve is open at engine start, both pack flow control valves close.
On the ground, reopening of the valves is delayed for up to 60 seconds to avoid a supplementary pack closure cycle during second engine start.

25
Q
  1. What logic controls the X-Bleed valve when the X-BLEED switch is in AUTO?
A

When the X BLEED selector is in the AUTO position, the crossbleed valve will open and close automatically, as follows (see Figure 5 below):
• If the APU bleed valve is open, the crossbleed valve will open
• If the APU bleed valve is closed, the crossbleed valve will close
• The crossbleed valve will also close if the system detects a bleed air leak (except during engine start)

Airbus A320 Family Systems (6 decks)

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