Air Condition/ Pressurization/ Ventilaion

Question 1

Safety Valves

Answer 1

There’s 2 independent pneumatic safety valves prevent cabin pressure to go too high (8,6 PSI above ambient) or too low (1 PSI Below ambient)

Question 2

Residual Pressure Control Unit

Answer 2

Depressurizes the aircraft in case of abnormal residual pressure on ground. Automatically open the outflow valve when:

• Outflow valve is not fully open, and
• Both CPCs are failed, or manual mode is selected, and
• Aircraft is on ground, and
• All engines are shutdown, or all ADIRS indicate an airspeed below 100 Kts

Question 3

Automatic Pressure Control Mode

Answer 3

Have 2 identical, independent, automatic system control cabin pressure. Either system controls the the single outflow valve. Only one controller operates at a time. Automatic transfer occurs:

• 70 s after each landing
• If the operational system fails
• Limit the cabin pressure to 8.000 Fts Max
• The controller normally uses the landing elevation and the QNH from the FMGC, and pressure altitude from ADIRS. If FMGC data are not available, the controller use the captain BARO Reference from the ADIRS and the LDG ELEV selection
• The aircraft is pre- pressurizes on takeoff phase at rate of 400 Fts/min until Dif pressure reach 0,1 PSI

Question 4

Pressurization Phases

Answer 4

• GROUND
• TAKEOFF
• CLIMB
• CRUISE
• DESCENT
• ABORT

Question 5

Manual Pressure Control Mode

Answer 5

*When using manual pressurization control, the outflow valve does not open automatically at touchdown

Question 6

Ditching pb

Answer 6

Close the followings:

• Outflow Valve
• Emergency RAM AIR inlet
• Avionics ventilation inlet and extract valves
• Pack Flow Control Valve
• FWD Cargo outlet isolation valve

Question 7

Cabin Differential Pressure indication

Answer 7

Amber= when differential pressure is ≤ -0,4 PSI or ≥ 8,5 PSI
Pulses= differential pressure is > 1.5 PSI

Question 8

Cabin Altitude Indication

Answer 8

• Green: Normal Range
• Pulse: Cabin altitude is at or above 8.800 Fts
• Red: Cabin Altitude goes above 9.550 Fts

Question 9

Safety Valve

Answer 9

Open when cabin differential pressure is between 8.2 and 8.9 PSI

Question 10

Outflow Valve position Indication

Answer 10

Green: The valve is operating normally
Amber: When valve opens more than 95% during flight

Question 11

Ventilation System

Answer 11

• The Avionics, controlled by the Avionics Equipment Ventilation Controller (AEVC)
• The batteries
• The lavatories and galleys