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?

Answer 2

• Closes the outflow valve
•  Closes the emergency RAM AIR inlet
•  Closes the Avionics Ventilation Inlet and Extract valves
• Closes pack flow control valves
•  Forward cargo isolation outlet valve (if installed)
•  Cargo recirculation fans stop automatically (if installed)
•  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