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above ambient) or too low (1 PSI below ambient).
They are located on the rear pressure bulkhead, above the flotation line.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
PRESSURIZATION - MAIN COMPONENTS
A318/A319/A320/A321 FLEET DSC-21-20-20 P 2/2
FCOM 19 AUG 10
RESIDUAL PRESSURE CONTROL UNIT
Applicable to:
,
,
MSN,,,,
The Residual Pressure Control Unit (RPCU) automatically depressurizes the aircraft in case of
abnormal residual pressure on ground. It automatically opens the outflow valve, when:
The outflow ‐ valve is not fully open, and
‐ Both CPCs are failed, or manual mode is selected, and
‐ The aircraft is on ground, and
‐ All engines are shutdown, or all ADIRS indicate an airspeed below 100 kt.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
PRESSURIZATION - SYSTEM OPERATION
A318/A319/A320/A321 FLEET DSC-21-20-30 P 1/4
FCOM 19 AUG 10
AUTOMATIC PRESSURE CONTROL MODE
Applicable to: ALL
GENERAL
‐ Two identical, independent, automatic systems (each consisting of a controller and its
associated motors) control cabin pressure.
Either system controls the single outflow valve.
Only one controller operates at a time.
An automatic transfer occurs :
• 70 s after each landing.
• If the operating system fails.
‐ The controller automatically controls the cabin pressure. It limits the cabin pressure to 8 000 ft
maximum and optimizes it during climb and descent phases.
‐ The controller normally uses the landing elevation and the QNH from the FMGC, and the
pressure altitude from ADIRS.
If FMGC data are not available, the controller uses the captain Baro Reference from the ADIRS
and the LDG ELEV selection.
‐ Pressurization is assumed through the following modes :
GROUND (GN)
Before takeoff, and 55 s after landing, the outflow valve fully opens to ensure that there is no
residual cabin pressure. At touchdown, any remaining cabin pressure is released at a cabin
vertical speed of 500 ft/min.
TAKEOFF (TO)
To avoid a pressure surge at rotation, the controller pre-pressurizes the aircraft at a rate of
400 ft/min, until the ▵P reaches 0.1 PSI. At lift-off, the controller initiates the climb phase.
CLIMB (CL)
During climb, the cabin altitude varies according to a fixed pre-programmed law that takes into
account the aircraft’s actual rate of climb.
CRUISE (CR)
During cruise, the controller maintains cabin altitude at the level-off value, or at the landing field
elevation, whichever is higher.
DESCENT (DE)
During descent, the controller maintains a cabin rate of descent, such that cabin pressure
equals the landing field pressure, just before landing.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
PRESSURIZATION - SYSTEM OPERATION
A318/A319/A320/A321 FLEET DSC-21-20-30 P 2/4
FCOM 19 AUG 10
The maximum descent rate is 750 ft/min.
ABORT (AB)
If the aircraft does not climb after takeoff, the abort mode prevents the cabin altitude from
climbing.
Cabin pressure is set back to the takeoff altitude +0.1 PSI.
PRESSURIZATION MODES SWITCHING
Applicable to: ALL
L3
FROM GN TO GN CL AB TO CL CR CR DE DE AB
TO TO CL CL AB GN GN CR CL DE CL GN CL
ENG 1 and ENG 2 TLA ≥ MCT (1) 1 0
L/G sys 1 or sys 2 COMPRESSED 1 1
One L/G sys UNLOADED and A/C speed above
100 kt 1 1
One L/G sys COMPRESSED and A/C speed below
100 kt 1 1
A/C ALT. < 8 000 ft 1A
A/C ALT. ≥ 8 000 ft 1
A/C ALT. CHANGE SINCE T/O ≤ SLFT 1A
A/C ALT. CHANGE SINCE T/O ≥ SLFT 1
A/C RATE OF CLIMB ≥ 21 SL FPM FOR 60 s. 1 1
A/C RATE OF CLIMB ≥ 100 SL FPM FOR 30 s. 0 1
A/C RATE OF DESCENT ≥ 200 SL FPM FOR 30 s. 1
CON
D I
T I
ONS
A/C RATE OF DESCENT ≥ 250 SL FPM FOR 30 s. 1
(1) Engine running
0 : Condition invalid
1 : Condition valid
1A : Only one A condition is necessary
EXAMPLE The cabin pressure controller switches from Climb mode (CL) to Abort mode (AB)
when:
The aircraft is below 8 000 ft, or the ‐ aircraft has changed altitude less than
5 075 ft since takeoff, and
The aircraft rate of descent is ‐ greater than 200 ft/min for 30 s.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
PRESSURIZATION - SYSTEM OPERATION
A318/A319/A320/A321 FLEET DSC-21-20-30 P 3/4
　
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