Air Conditioning Panel

Question 1

The pneumatic system is monitored and controlled by?

Answer 1

2 Bleed Monitoring Computers (BMC)

Question 2

If one BMC fails, can the other take over?

Answer 2

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

Question 3

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

Answer 3

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

Question 4

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

Answer 4

Hi

Question 5

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

Answer 5

IF A/C 201-299, 301-399, AND 910-999 (A319/320):
LO:If the number of passengers is below 115.
NORM:For normal operating conditions.
HI: For abnormally hot and/or humid conditions.

IF A/C 701 – 799 (A321):
ON: For ECON flow if the number of passengers is below 140. OFF:For normal flow.

Question 6

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

Answer 6

Minimum idle engine speed is automatically increased to provide adequate bleed air pressure

Question 7

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

Answer 7

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

Question 8

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

Answer 8

Bleed leak (APU bleed valve closes)

Question 9

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

Answer 9

Leak.
Overpressure - Downstream of the bleed valve.
Overheat.
Start in process.
APU bleed valve open and engine bleed valve not closed

Question 10

What are the two functions of the engine bleed valves?

Answer 10

To Act as:
Pressure regulation
Shut off valves

Question 11

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

Answer 11

ΔP less than 1 PSI

Question 12

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

Answer 12

When APU bleed valve is OPEN, the X-Bleed valve is open When APU bleed valve is CLOSED, the X-Bleed valve is closed X-Bleed also CLOSES for wing, pylon, or APU duct leak (except during engine start)

Question 13

What causes the Pack Flow Control valve to automatically close?

Answer 13

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

Question 14

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

Answer 14

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

Question 15

How many Air Conditioning System Controllers are there?

Answer 15

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

Question 16

Describe how the Air Conditioning System Controllers regulate temperature?

Answer 16

Basic temperature regulation: Both packs produce the required outlet temperature determined by the lowest demanded zone temperature Optimized temperature regulation: Hot air is added to the individual zones by the trim air valves to maintain the desired zone temperatures

Question 17

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

Answer 17

The second lane takes over

Question 18

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

Answer 18

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

Question 19

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?

Answer 19

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 20

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

Answer 20

The affected pack will operate as a heat exchanger

Question 21

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

Answer 21

The pack flow control valve will close automatically

Question 22

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

Answer 22

APU Bleed

Question 23

When does the Lav/Galley Extract Fan operate?

Answer 23

Continuously when electrical power is available