*Air Cond/Press/Ventilation

Question 1

What does the DITCHING pb do?

Answer 1

Closes all valves below the waterline.
-C- Cargo Compartment Isolation Valve.
-A- Avionics ventilation (inlet/extract valves)
-R- Ram air inlet.
-P- Pack FCVs.
-O- Outflow valve (if in AUTO).

Question 2

Can the pilot control the outflow valve?

Answer 2

YES, select MAN on the MODE SEL and use the MAN V/S CTL switch.

Question 3

How many auto pressure controllers?

Answer 3

2: only one is used at a time and they swap roles after each landing.

Question 4

How do you manually switch controllers?

Answer 4

Switch MODE SEL to MAN for 10 sec., then back to AUTO.

Question 5

What does an amber FAULT light in the MODE SEL pb indicate?

Answer 5

Both automatic pressure controllers are faulty.

Question 6

The LDG ELEV selector in the AUTO position does what?

Answer 6

The pressurization system uses the FMGS data to construct an optimized pressurization schedule.

Question 7

Where does the pressurization system obtain the landing elevation from?

Answer 7

The FMGC database.

Question 8

What causes the Pack Flow Control Valve to close automatically? (UPEED)
5

Answer 8

-Upstream pressure below min
-Pack overheat
-Engine Start sequence
-Engine Fire Push Button pressed
-DITCHING Pb selected

Question 9

Amber FAULT light in the HOT AIR Pb

Answer 9

Duct Overheat- The Hot Air and Trim Valves close automatically.

Question 10

FAULT light in the Pack 1/2 pushbutton (OOD)

Answer 10

Overheat pack outlet
Overheat Compressor outlet
Disagreement light. Switch position disagrees with pack flow control valve.

Question 11

How many Air Conditioning System Controllers are there, and how many lanes do they have?

Answer 11

2 ACSC, each as 2 lanes. 1 active, 1 STBY
When one lane fails the other automatically takes over.

Question 12

Describe how the AC System Controllers regulate temperature?

Answer 12

Basic Temp. Regulation. Both packs produce the required outlet temperature determined by the lowest zone.
Optimized Temp. Regulation. Hot air is added to the individual zone by the trim air valves.

Question 13

Will the DITCHING Pb always close the outflow valve?

Answer 13

Not if the outflow valve is under manual control.

Question 14

What protects the airframe from excessive cabin differential pressure?

Answer 14

2 pressure relief valves (safety valves)

Question 15

How many outflow valves motors are there?

Answer 15

3 total. 1 for each CPC, and one for the manual control.

Question 16

How do you manually control the pressurization.

Answer 16

Select MAN on the MODE SEL pb and utilizing the MAN V/S CTL toggle switch.

Question 17

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

Answer 17

Hi

Question 18

If the engine bleed air in flight is too low, what will happen?

Answer 18

Engine speed is automatically increased to provide adequate bleed air.

Question 19

At what cabin diff pressure will the RAM AIR valve open?

Answer 19

1 PSID or less.

Question 20

What occurs when an active lane of an ACSC fails?

Answer 20

The second lane takes over.

Question 21

What occurs when both lanes of an ACSC fail?

Answer 21

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

Question 22

How does the Air Conditioning System Controller configure its associated pack ram air inlet flap for takeoff and landing to avoid ingestion of foreign matter?

Answer 22

TAKEOFF: Pack Ram Air Inlet Flap closes when takeoff power is set and the main landing gear struts are compressed. Reopens after main gear strut extension.
LANDING: Pack Ram Air Inlet Flap closes as soon as the main landing gear struts are compressed and speed at or above 70 KTS. Opens 20 seconds after speed below 70 KTS.

Question 23

If an ACM fails, what happens?

Answer 23

The pack will operate as a heat exchanger.

Question 24

What affect will the engine start sequence have on the pack flow control valve?

Answer 24

It will close automatically.

Question 25

What does the CARGO HEAT HOT AIR amber fault light indicate?

Answer 25

Duct overheat.

Question 26

If the FMGC database does not supply the landing elevation, how do you set the landing elevation?

Answer 26

Manually by selecting landing elevation via the LDG ELEV knob.