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Cabin Pressure Controller
Also from: CPC
The 2 CPCs control the outflow valves using electric motors. Each CPC has 2 electric motors. Only 1 CPC plus its 2 motors operate at a time. There is a system transfer if there is a failure of the operating system, or 80s after each landing, or by changing the MODE SEL pb to MAN for at least 3s and then back to AUTO.
The controller installed in #1 position provides indications on the ECAM in manual mode.
The maximum cabin altitude is 7,350' for flights longer than 2.5hrs and 8,000' for flights shorter than 2.5hrs.
Automatic modes
| Ground (GND) | before takeoff; 80s after landing | outflow valves fully open |
| Takeoff (TO) | up to lift off | Δp 0.1 psi |
| Climb in Internal Mode (CI) | cabin V/S varied to reach CAB ALT at top of climb | |
| Climb in External Mode (CE) | cabin altitude varies according to FMGS estimated times | |
| Cruise (CRZ) | cabin altitude is directly controlled | |
| Descent in Internal Mode (DI) | cabin pressure to reach landing field pressure +0.1 psi just prior to landing | |
| Descent in External Mode (DE) | cabin altitude varies according to FMGS estimated times | |
| Abort (AB) | aircraft does not climb after takeoff | cabin pressure kept to the value before takeoff |
Maximum cabin V/S for climb is 1,000 fpm, and for descent is 750 fpm.
Failures
| CAB PR SYS 1(2) FAULT | - crew awareness, no master caution |
| CAB PR SYS 1+2 FAULT | - FAULT light on MODE SEL pb on CABIN PRESS overhead panel - manual control will be required - the STATUS page provides target cabin altitudes and vertical speeds to follow |