CABIN PRESS Panel

Question 1

How is the landing field elevation entered into the pressurization system in automatic, semi-automatic and manual modes?

Answer 1

• Automatic = FMGC (LDG ELEV must be in AUTO)
  - Semi-automatic = by LDG ELEV selector button
  - Manual = By selecting the MODE SEL to MAN and then using the MAN V/S
  CTL toggle switch

Question 2

What does selecting the DITCHING pushbutton ON accomplish?

1-7

Answer 2

1. Closes the outflow valve
2. Closes the emergency RAM AIR inlet
3. Closes the Avionics Ventilation Inlet and Extract valves
4. Closes pack flow control valves
5. Forward cargo isolation outlet valve (if installed)
6. Cargo recirculation fans stop automatically (if installed)
7. Closes all valves below the waterline

Question 3

How many controllers are in the pressurization system? Do they share the load?

Answer 3

 Two, only one is used at a time and they swap roles after each landing.

Question 4

How can a pilot manually switch controllers?

Answer 4

 Switch MODE SEL to MAN for 10 seconds, then back to AUTO

Question 5

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

Answer 5

 Both automatic pressure controllers are faulty.

Question 6

What protects the airframe from excessive cabin differential pressure?

Answer 6

 Two pressure relief valves