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AIR CONDITIONING / PRESSURIZATION / VENTILATION
PRESSURIZATION - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-21-20-40 P 3/12
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to:
,
,
MSN,,
4538,,
(1) LDG ELEV selector
AUTO : The pressurization system uses the FMGS data to construct an optimized
pressure schedule.
To exit the AUTO position, pull out and turn the selector.
Other
positions
: The pressurization schedule does not use the landing elevation from the
FMGS, but instead uses the landing elevation selected with this knob (from
-2 000 to +14 000 ft) as its reference.
Note: The LDG ELEV selector scale is only given as an indication ; refer
to the ECAM information for accurate adjustment.
(2) MODE SEL pushbutton
AUTO : Automatic mode is operating. One of the two systems controls the outflow
valve.
Note: If the pilot suspects that the operating pressurization system is not
performing properly, he can attempt to select the other system by
switching the MODE SEL pushbutton to MAN, for at least 10 s, then
returning it to AUTO.
MAN : This legend appears in white, and FAULT does not come on. The flight crew
then uses the MAN V/S CTL switch to control the outflow valve.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
PRESSURIZATION - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-21-20-40 P 4/12
FCOM 19 AUG 10
FAULT lt : This legend appears in amber and the ECAM caution light comes on only when
both automatic systems are faulty.
Note: The pilot may notice a variation in the CAB ALT indication on the
ECAM PRESS page, when the system switches from the cabin
pressure control AUTO mode to MAN mode, due to the reduced
resolution of the backup pressure sensor.
(3) MAN V/S CTL switch
The switch is springloaded to neutral and controls the outflow valve position through operation
of the MAN motor, when the MODE SEL pushbutton is in the MAN position.
UP : The valve moves towards the open position.
DN : The valve moves towards the closed position.
Note: The outflow valve operates slowly, so the pilot must hold the switch in the UP or DN
position until reaching the target V/S.
(4) DITCHING pushbutton
Normal: The system functions normally.
ON : The operating system sends a “close” signal to the outflow valve, emergency ram
air inlet, avionics ventilation inlet and extract valves, pack flow control valves, and
forward cargo isolation outlet valve.
The cargo recirculation fans stop automatically.
Note: The outflow valve will not close automatically, if it is under manual control.
CAUTION On ground, If the ditching pushbutton is set to ON, with the low
pressure ground cart connected and all doors closed, a differential
pressure will build up.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
PRESSURIZATION - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-21-20-40 P 5/12
FCOM 19 AUG 10
ECAM CAB PRESS PAGE
Applicable to:
(1) LDG ELEV AUTO/MAN
LDG ELEV AUTO : appears in green when the LDG ELEV selector is in AUTO.
LDG ELEV AUTO : appears in green when the LDG ELEV selector is not in AUTO.
Neither appears when the MODE SEL pushbutton switch is in MAN.
(2) Landing elevation
The landing elevation selected either automatically by the FMGS or manually by the pilot
appears in green (but not when the MODE SEL pushbutton switch is in MAN).
(3) V/S FT/MIN (cabin vertical speed)
The analog and digital presentations appear in green when V/S is in the normal range.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
PRESSURIZATION - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-21-20-40 P 6/12
FCOM 19 AUG 10
They appear in amber when V/S ≥ 2 000 ft/min.
The digital presentation pulses when V/S > 1 800 ft/min (resets at 1 600 ft/min).
(4) ΔP PSI (cabin differential pressure)
The analog and digital presentations appear in green when ▵P is in the normal range.
They appear in amber when ΔP ≤ –0.4 PSI or ≥ 8.5 PSI.
The digital presentation pulses if Δp > 1.5 PSI (resets at 1 PSI) during flight phase 7. (Refer to
DSC-21-20-50 WARNINGS AND CAUTIONS).
(5) CAB ALT FT (cabin altitude)
The analog and digital presentations appear in green, in normal range.
They appear in red if the cabin altitude goes above 9 550 ft.
The digital presentation pulses if the cabin altitude is at or above 8 800 ft (resets at 8 600 ft).
　
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