Cabin Pressurization Panel

Question 1

What is the Manual V/S CTL lever on the Cabin Press panel? UP, DN

Answer 1

When the Model Sel pb is selected to manual, a third system, a motorized controlled motor, used for controlling the position of the outflow valve in the event of a dual CPC failure

UP - outflow valve opens

DN - outflow valve closes

Question 2

When controlling the outflow valve manualy, the target V/S for a climb and descent are:

Answer 2

Climbing at 500ft/min, descending at 300ft/min

Question 3

Mode Sel pb Auto, Man, Fault

Answer 3

Auto

1. Lights out
2. The outflow valve is controlled automatically.
3. The two CPC switch after each touch down
4. The 2 CPC can be switched manually by setting the Mode Sel to MAN for 10 seconds then back to auto

MAN white
The crew can manually control the outflow valve using the MAN V/S CTL toggle

Fault
Appears in amber with ECAM only if both CPC computers are faulty

Question 4

LDG ELEV knob

Answer 4

Auto
The pressurization system takes elevation data from the FMGS

Numbered postions

1. Labeled from -2 (-2,000ft) to 14 (14,000ft)
2. To gain manual control, pull the knob then turn
3. Data is no longer taken from the FMGS but is manually set by the crew as is the case in a dual FMGC failure

Question 5

Ditching guarded pb Normal, On, Caution

Answer 5

Normal
System functions normally

On
A close signal is sent to the
1. Outflow valve
2. Ram air inlet
3. Avionics ventilation inlet and extract valves
4. Pack flow control valves
5. Note: The outflow valve will not close automatically if it is manually controlled. It must be set full DN by the crew

Caution!
If pressed on the ground, with the low pressure ground cart connected and all the doors closed, differential pressure will build up