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- Motor 2 is controlled by controller 2.
Controller 2 plus motor 2 corresponds to system 2.
Two electronic actuators ensure the interface with the
controllers. A pressure switch, which operates
independently from the automatic operation, is
installed in each electronic actuator. It closes the
applicable outflow valve in case of cabin altitude
above 15000 ft.
Motor 3 is controlled from the cabin pressure panel
by the MAN V/S toggle switch when manual mode is
selected on the MODE SEL pushbutton. The manual motor
is used in case of failure of system 1 and 2.
The outflow valve position monitoring is based on a
triple potentiometer principle.
Potentiometer 1(2) generates a feedback signal, sent
to CPC 1(2) through electronic actuator 1(2). It is
used for indication and initialization purposes in
automatic operation.
Potentiometer 3 generates a feedback signal, sent
straight to the CPC 1 manual backup part. It is used
for indication purposes in manual operation only.
SAFETY VALVES
The safety valves prevent excessive positive and
negative differential pressure in the fuselage. They
are installed on the aft pressure bulkhead above the
aircraft flotation line. The safety valves are poppet
type pneumatic valves. They operate independently.
TMUPRE80A-T01 LEVEL 1
EFFECTIVITY 21-31-00 Page 2
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 148
ALL
PRESSURIZATION - SYSTEM PRESENTATION - CABIN PRESSURE CONTROLLERS - OUTFLOW VALVE -
SAFETY VALVES
TMUPRE80A-P01 LEVEL 1
EFFECTIVITY 21-31-00 Page 3
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 149
ALL
PRESSURIZATION - SYSTEM PRESENTATION
CABIN PRESSURE ALTITUDE ENVELOPPE
The cabin altitude is limited to 8000 feet with a
differential pressure of 8.06 psi for an aircraft
altitude of 39000 feet.
If cabin altitude increases:
- at 9550 ft, the master warning comes on,
- at 11300 ft, passenger signs are activated.
In the outflow valve, a safety device closes the valve
when the cabin altitude reaches 15000 ft.
TMUPRE80A-T02 LEVEL 1
EFFECTIVITY 21-31-00 Page 4
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 150
ALL
TMUPRE80A-P02 LEVEL 1
PRESSURIZATION - SYSTEM PRESENTATION - CABIN PRESSURE ALTITUDE ENVELOPPE
EFFECTIVITY 21-31-00 Page 5
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 151
ALL
SELF EXAMINATION
Which motor(s) is(are) controlled from the cabin
pressure panel ?
A - Motor 3.
B - Motor 2 and motor 1.
C - Motor 1.
What is the maximum normal cabin altitude for
maximum cruise level (39000 ft) ?
A - A cabin altitude of 8000 ft.
B - A cabin altitude of 9550 ft.
C - A cabin altitude of 11300 ft.
TMUPRE80A LEVEL 1
EFFECTIVITY 21-31-00 Page 6
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 152
ALL
21 - AIR CONDITIONING
21-31-00 PRESSURIZATION -
SYSTEM CONTROLS AND INDICATING
CONTENTS:
Landing Elevation Selector
Control MODE SEL Pushbutton And MAN V/S Toggle SW
Ditching Pushbutton
Self Examination
TMUPRE40A LEVEL 1
EFFECTIVITY 21-31-00 Page 1
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 153
ALL
PRESSURIZATION - SYSTEM CONTROLS AND INDICATING
LANDING ELEVATION SELECTOR
When the LDG ELEV selector is in AUTO position, the
system is in normal operation conditions. The landing
elevation comes from the Flight Management & Guidance
System (automatic operation).
In other positions the selected landing elevation is
used (semi-automatic operation).
When not set to AUTO and as the scale on the LDG ELEV
rotary selector is inaccurate, use the ECAM CAB PRESS
page to correctly set the landing elevation (if QNH
used) or zero (if QFE used).
CONTROL MODE SEL PUSHBUTTON AND MAN V/S TOGGLE SW
When the MODE SEL pushbutton is in the AUTO position,
the outflow valve is automatically controlled by the
active system. The CPCs use the data from the Flight
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