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FCOM 19 AUG 10
PRESSURIZATION FLIGHT PROFILE
Applicable to: ALL
MANUAL PRESSURE CONTROL MODE
Applicable to: ALL
If both automatic systems fail, the flight crew may use the CABIN PRESS control panel to take over
manual control of cabin pressurization.
• Press the MODE SEL pushbutton to select MAN, and
• Push the MAN V/S CTL switch UP or DN to increase or decrease cabin altitude.
The first of these actions cuts off power to the AUTO motors, and enables the MAN motor to control
the outflow valve.
Note: 1. Due to the slow operation of the outflow valves in manual mode, and the limited
resolution of the outflow valves' position on the ECAM, the visual ECAM indication of a
change in the outflow valves' position can take up to 5 s.
2. As the pressurization system is manually-controlled, the outflow valve does not open
automatically at touchdown.
DITCHING
Applicable to:
To prepare for ditching, the flight crew must press the DITCHING pushbutton on the CABIN PRESS
control panel to close the outflow valve, the emergency ram air inlet, the avionics ventilation inlet and
extract valves, and the pack flow control valves.
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 4/4
FCOM 19 AUG 10
DITCHING
Applicable to:
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To prepare for ditching, the flight crew must press the DITCHING pushbutton on the CABIN PRESS
control panel to close the outflow valve, the emergency ram air inlet, the avionics ventilation inlet and
extract valves, the pack flow control valves, and the forward cargo outlet isolation 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 1/12
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to:
(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 2/12
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.
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
中国航空网 www.aero.cn
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 1(19)
