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21-31-00 PRESSURIZATION -
SYSTEM DESIGN PHILOSOPHY
CONTENTS:
General
Design Philosophy
Self Examination
TMUPRE702 LEVEL 1
EFFECTIVITY 21-31-00 Page 1
Oct 30/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 143
ALL
PRESSURIZATION - SYSTEM DESIGN PHILOSOPHY
GENERAL
The pressurization system ensures a cabin altitude
safe and compatible with crew and passenger comfort.
Pressurization is performed by controlling the amount
of air discharged overboard through one outflow valve.
DESIGN PHILOSOPHY
The system has two identical and independent automatic
controllers.
Only one controller operates at a time, the other is
in active stand-by.
In normal condition, the system operation is fully
automatic.
The automatic cabin pressure control operation is
dependent on programmed control laws and
information from FMGCs and ADIRUs.
Manual mode permits full pressurization control in
case of failure of both automatic systems.
The cabin altitude can be manually controlled by
operating the outflow valve in manual mode.
Two safety valves are installed on the aft pressure
bulkhead to prevent excessive positive and negative
differential pressure.
The two safety valves are installed above the aircraft
floatation line.
TMUPRE702-T01 LEVEL 1
EFFECTIVITY 21-31-00 Page 2
Oct 30/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 144
ALL
PRESSURIZATION - SYSTEM DESIGN PHILOSOPHY
TMUPRE702-P01 LEVEL 1
EFFECTIVITY 21-31-00 Page 3
Oct 30/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 145
ALL
SELF EXAMINATION
What is the number of outflow valves and safety
valves ?
A - One outflow valve and one safety valve.
B - One outflow valve and two safety valves.
C - Two outflow valves and two safety valves.
What happens when manual mode is used ?
A - The system continues to operate
automatically.
B - The outflow valve can be manually
controlled to adjust the cabin altitude.
C - The safety valves open.
What is the purpose of the safety valves ?
A - To avoid negative differential pressure.
B - To replace the outflow valves.
C - To prevent excessive positive and
negative differential pressure.
TMUPRE702 LEVEL 1
EFFECTIVITY 21-31-00 Page 4
Oct 30/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 146
ALL
21 - AIR CONDITIONING
21-31-00 PRESSURIZATION -
SYSTEM PRESENTATION
CONTENTS:
Cabin Pressure Controllers
Outflow Valve
Safety Valves
Cabin Pressure Altitude Enveloppe
Self Examination
TMUPRE80A 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 147
ALL
PRESSURIZATION - SYSTEM PRESENTATION
CABIN PRESSURE CONTROLLERS
There are two interchangeable controllers which are
identified as CPC 1 and CPC 2 by means of pin
programming.
Each controller has an automatic and manual part which
are functionally and electronically independent of
each other.
One controller operates the system at a time
according to flight profile data and aircraft
configurations. The second controller is in active
stand-by with automatic change over after each flight
or in case of failure of the active one.
CPCs inputs:
- flight profile data (FMGS, ADIRS, CFDS),
- aircraft configurations (EIU, LGCIU, ECS).
CPCs outputs:
- for indicating and monitoring (FWC, SDAC, CFDS,
ECS, AIDS).
When manual mode is used,the manual part of controller
1 operates only as a back up indication circuit
processing outputs for indicating and monitoring.
CPC 1 manual part outputs:
- for monitoring and indicating (FWC, SDAC).
CPC 2 manual part is not used.
OUTFLOW VALVE
In automatic mode, the outflow valve is controlled
by the operating controller. The outflow valve is of
the double flap and motor driven type.
In automatic operation, the outflow valve is operated
by electrical motor 1 or motor 2 depending on the
operating controller.
- Motor 1 is controlled by controller 1.
Controller 1 plus motor 1 corresponds to system 1.
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ATA 21 AIR CONDITIONING(22)
