Air Conditioning Panel - Rev 04

Question 1

The pneumatic system is monitored and controlled by…?

(FCOM-DSC-36-10-10)

Answer 1

2 Bleed Monitoring Computers (BMC)

Question 2

If one BMC fails, can the other take over?

(FCOM-DSC-36-10-20)

Answer 2

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

Question 3

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

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Answer 3

HI

Question 4

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

(FCOM-PRO-NOR-SOP-06)

Answer 4

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

Question 5

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

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Answer 5

Engine speed is automatically increased to provide adequate bleed air pressure

Question 6

What would cause an amber FAULT light to illuminate in the PACK 1 and/or Pack 2 push button?

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Answer 6

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.

Question 7

What does the amber FAULT light in the APU BLEED push button indicate?

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Answer 7

Bleed leak

(APU bleed valve closes)

Question 8

What causes the amber FAULT light on the ENG 1 BLEED and/or ENG 2 BLEED push button?

(FCOMDSC-36-20)

Answer 8

OOLDE

Overpressure - Downstream of the bleed valve

Overheat

Leak - Low pressure

Discontinuity - APU bleed valve open and engine bleed valve not closed or

Engine Start with bleed valve not closed

Question 9

What are the two functions of the engine bleed valves?

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Answer 9

a. Pressure regulation

b. Shut off valves

Question 10

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

(FCOM-DSC-21-10-20)

Answer 10

1 PSI ΔP or less

Question 11

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

(FCOM-DSC-36-10-40)

Answer 11

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)

Question 12

What causes the Pack Flow Control valve to automatically close?

(FCOM-DSC-21-10-50)

Answer 12

UPEED

Upstream pressure below minimum

Pack overheat

Engine start sequence

Engine FIRE push button on the related side pressed

DITCHING push button is selected

Question 13

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

(FCOM-DSC-21-10-50)

Answer 13

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

Question 14

How many Air Conditioning System Controllers are there?

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Answer 14

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

Question 15

Describe how the Air Conditioning System Controllers regulate temperature?

(FCOM-DSC-21-10-30)

Answer 15

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.

Question 16

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

(FCOM-DSC-21-10-40)

Answer 16

The second lane takes over

Question 17

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

(FCOM-DSC-21-10-40)

Answer 17

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

Question 18

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?

(FCOM-DSC-21-10-30)

Answer 18

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.

Question 19

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

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Answer 19

The affected pack will operate as a heat exchanger

Question 20

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

(FCOM-DSC-21-10-20)

Answer 20

The pack flow control valve will close automatically

Question 21

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

(FCOM-DSC-36-10-20)

Answer 21

APU Bleed

Question 22

When does the Lav/Galley Extract Fan operate?

(FCOM-DSC-21-30-50)

Answer 22

Continuously when electrical power is available