R **ON A/C 401-499,
(2) MODE SEL Pushbutton Switch
-AUTO The automatic mode of the active CPC operates the outflow valve and supplies data for indication on the EIS.
-MAN When the MODE SEL pushbutton switch is released (the MAN legend comes on), the manual operation is active.
-FAULT The FAULT legend comes on if both automatic systems are defective. When the pushbutton switch is released (the MAN legend comes on and the FAULT legend goes off) the manual control is then operative with the toggle switch to control outflow valve position.
-For CPC P/N 20791 only: Push and release the MAN pushbutton switch to switch the active auto system in stand-by and the stand-by auto system takes over control.
(3)
V/S CTL Toggle Switch The switch, spring loaded to neutral,controls the outflow valve with the manual motor, when the MODE SEL pushbutton switch is in the MAN position.
-UP : The outflow valve move towards the open position,
-DN : The outflow valve move towards the closed position.
(4)
DITCHING pushbutton switch (guarded black)
-Normal released Position
Normal system operation.
-ON When the pushbutton switch 13HL is pushed (the ON legend comes on) and the aircraft goes into the ditching configuration. This closes: .the outflow valve 10HL, .the pack flow control valves of the flow control units 23HB (24HB), .the avionics skin air inlet valve 15HQ, if open, .the avionics skin air outlet valve 22HQ, if open, .the emergency ram-air inlet, if open, .the fwd cargo isolation valves 4HN (5HN), if installed.
**ON A/C ALL
F. Failure Indications
(1) Excessive Cabin Altitude
If the cabin altitude is between 9200 and 9900 ft.:
-a Continuous Repetative Chime (CRC) comes on in the cockpit,
-red MASTER WARN lights flashes on the glareshield panel,
- on the ECAM upper display unit, the warning CAB PRESS EXCESS CAB ALT comes on.
(2) CPCS 1+2 Fault
If there is a failure in both CPCS:
-a Single Chime (SC) comes on in the cockpit,
-the MASTER CAUT lights appear on the glareshield panel,
- on the ECAM upper display unit, the warning CAB PRESS SYS 1+2 FAULT comes on.
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(3)
CPCS 1(2) Fault If there is a failure in one of the CPCS: - on the ECAM upper display unit, the warning CAB PRESS SYS 1(2)
FAULT comes on.
(4)
LDG ELEV Fault If there is no landing field elevation data available from the FMGS and the LFES is selected to AUTO:
-a SC comes on in the cockpit,
-the MASTER CAUT lights appear on the glareshield panel,
- on the ECAM upper display unit, the warning CAB PRESS LDG ELEV FAULT comes on.
(5) Outflow Valve not open
If the outflow valve is not open on the ground for more than 3
minutes:
-a SC comes on in the cockpit,
-the MASTER CAUT lights appear on the glareshield panel,
- on the ECAM upper display unit, the warning CAB PRESS OUTFLOW VALVE NOT OPEN comes on.
(6) Safety Valve open If the safety valves are not fully closed on the ground or not fully closed in flight for more than 1 minute:
-a SC comes on in the cockpit,
-the MASTER CAUT lights appear on the glareshield panel,
- on the ECAM upper display unit, the warning CAB PRESS SAFETY VALVE OPEN comes on.
(7) Low Differential Pressure If the CPC detects in the descent phase that delta-P gets zero within
1.5 minutes and more than 0.5 minutes earlier than the cabin reaches the landing field pressure:
-a SC comes on in the cockpit,
-the MASTER CAUT lights appear on the glareshield panel,
- on the ECAM upper display unit, the warning CAB PRESS LOW DIFF PR comes on.
G. Cabin Altitude Indication
(1) Auto Mode
The calculation of the cabin altitude in the AUTO mode is done
depending on the aircraft altitude.
-if the aircraft altitude is higher than 5000 ft. above take-off or landing fields, the cabin altitude is calculated to the standard atmosphere.
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-if the aircraft altitude is lower than 5000 ft. above take-off or landing fields, the cabin altitude is calculated to the actual altitude above sea level (using the barometric correction from the ADIRS).
(2)
Manual Mode The calculation of the cabin altitude in the MAN mode is done in the SDACs to standard atmosphere (the CPCS manual backup circuit provides the SDAC with a cabin pressure value). Therefore, there can be a slight difference in the cabin altitude between AUTO and MAN mode if the aircraft altitude is higher than 5000 ft. above take-off or landing fields. There may be a difference between the cabin altitude due to the actual barometric conditions (weather) if the aircraft altitude is lower than 5000 ft. above take-off or landing fields.
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