AIR CONDITION 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

On the ECAM Bleed page, how do you tell if GND HP air supply is connected?

Answer 3

The GND unit temperature and pressure are indicated on the ECAM BLEED page at #1 bleed display

Question 4

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

Answer 4

Select pack flow rates representing LO 80%, NORM 100%, and HIGH 120% of NORM according to number of pax and ambient conditions.

Question 5

When would you select LO or HI on the PACK FLOW selector?

Answer 5

LO if the number of pax is below 115, HI for abnormally hot and humid conditions

Question 6

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

Answer 6

• HI (A319/320)

* NORM (A321)

Question 7

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

Answer 7

Engine speed is automatically increased to provide adequate bleed air pressure

Question 8

What would cause an amber PACK FAULT light to illuminate (PCS)?

Answer 8

• Pack outlet overheat
• Compressor outlet overheat
• Switch position disagreement with pack flow control valve

Question 9

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

Answer 9

Bleed leak (APU bleed valve closes)

Question 10

What causes the amber FAULT light on the ENG BLEED pb (ASOLO)?

Answer 10

• APU bleed valve open and engine bleed valve not closed
• Engine Start with bleed valve not closed
• Overpressure downstream of the bleed valve
• Leak (low pressure)
• Overheat

Question 11

What are the two functions of the engine bleed valves?

Answer 11

• Pressure regulation

* Shut off valves

Question 12

What is the RAM AIR pb used for?

Answer 12

• Smoke removal in cabin

* Ventilation of cabin with a dual pack failure

Question 13

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

Answer 13

1 PSI ΔP or less

Question 14

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

Answer 14

• 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 15

What causes the Pack Flow Control valve to automatically close?

Answer 15

• Upstream pressure below minimum
• Compressor outlet overheat
• Engine start sequence (ENG MODE SEL in IGN/START)
• Engine FIRE pb on the related side pressed & released
• DITCH pb is selected

Question 16

What does the amber HOT AIR FAULT light indicate?

Answer 16

Duct overheat. The Hot Air and Trim Air valves close automatically

Question 17

What is the function of the HOT AIR pb?

Answer 17

Controls the hot air pressure regulating valves which controls the flow of hot air to the trim air valves. This hot
air is mixed with the pack-conditioned air for zone temperature control

Question 18

How many Air Conditioning System Controllers are there?

Answer 18

2 (2 lanes each)

Question 19

Describe how the air conditioning system controls the temperature in each zone?

Answer 19

• Pack output temperature regulation is determined by the zone requiring the coldest air
• Hot air is added to the individual zones by the trim air valves to maintain the desired zone temperatures

Question 20

If the one lane in an Air Conditioning System Controller fails how is that Pack affected?

Answer 20

No effect, as the second lane provides full controller and air conditioning functionality

Question 21

If both lanes in the Air Conditioning System Controller fail, what occurs?

Answer 21

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

Question 22

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

Answer 22

The affected pack will operate as a heat exchanger

Question 23

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

Answer 23

The pack flow control valve will close automatically

Question 24

What causes the pack flow control valve to close?

Answer 24

• Upstream pressure below minimum
• Compressor outlet overheat
• During engine start
• FIRE pb on that side pressed
• DITCHING pb pressed

Question 25

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

Answer 25

APU Bleed

Question 26

When does the Lav/Galley Extract Fan operate?

Answer 26

Continuously when electrical power is available

Question 27

If the Lav/Galley Extract Fan fails, what occurs?

Answer 27

Cabin temperature defaults to a set value