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the PRV/HPV sense line.
IPC
The Intermediate Pressure Check Valve protects the IP
stage from reverse flow when the High Pressure Valve
is open.
PRV/CTS
The PRV pneumatically regulates the bleed pressure
around 44 psi.
A thermal fuse causes the valve to close in case of
engine fire (450°C).
The PRV is pneumatically controlled by an external
servo-control, the Bleed Pressure Regulated Valve
Control Solenoid (CTS), located downstream from the
precooler.
The CTS operates in two modes, pneumatically and
electrically, causing a partial or complete closure
of the PRV.
Pneumatic mode:
- Temperature limitation downstream of the
precooler by means of the CTS thermostat. When
the temperature increases and reaches 235°C,
the PRV downstream pressure is progressively
reduced up to 17,5 psi when the temperature
gets higher than 245°C.
- Reverse flow protection by closing the PRV when
a DP between the precooler outlet and the PRV
inlet is detected.
Electrical mode: (PRV shut-off function through the
CTS solenoid energization)
- Eng. Bleed P/B selected "OFF".
- Eng. Fire P/B selected on.
The solenoid is automatically energized by the BMC
in the following cases :
- Overtemperature downstream of the precooler
(the heat exchanger outlet temperature sensor
T senses a temperature above 257°C.
- Overpressure downstream of the PRV (the
pressure regulated transducer Pt senses a
pressure greater than 57 psi).
- Leak detection in pylon/wing/fuselage ducts
surrounding areas.
- APU bleed valve not closed.
- Corresponding starter valve not closed.
TMUPNEB02-T01 LEVEL 3
EFFECTIVITY 36-10-00 Page 2
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 36 PNEUMATIC SYSTEM
UF94200
EFFECTIVITY Page 16
ALL
ENGINE BLEED SYSTEM DESCRIPTION
TMUPNEB02-P01 LEVEL 3
EFFECTIVITY 36-10-00 Page 3
Aug 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 36 PNEUMATIC SYSTEM
UF94200
EFFECTIVITY Page 17
ALL
ENGINE BLEED SYSTEM DESCRIPTION
OPV
The OverPressure Valve(OPV), normally open,
pneumatically closes.
The OPV starts to close at 75 psi. It is fully closed
at 85 psi and opens again at 35 psi.
Pr
A transducer, connected to the Bleed Monitoring
Computer, reads the regulated pressure downstream from
the PRV. This pressure is indicated on the ECAM.
Pt
A transducer, connected to the Bleed Monitoring
Computer, reads the transferred pressure downstream
from the HPV.
This pressure is used to monitor PRV and HPV.
FAV/CT
The Fan Air Valve (FAV) pneumatically regulates the
fan air flow to the precooler for bleed air temperature
regulation (200°C).
The FAV is pneumatically controlled by an external
servo-control: the Fan Air Valve Control Thermostat
(CT), located downstream from the precooler.
A thermal fuse installed in the valve body closes the
valve if a temperature of 450°C is reached.
PRECOOLER
The precooler is an air to air heat exchanger.
HEAT EXCHANGER OUTLET TEMPERATURE SENSOR (T)
The Heat Exchanger Outlet Temperature Sensor (T),
connected to both Bleed Monitoring Computers, reads
the regulated temperature downstream from the
precooler.
This temperature is indicated on the ECAM and used to
monitor the system.
TMUPNEB02-T01 LEVEL 3
EFFECTIVITY 36-10-00 Page 4
Aug 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 36 PNEUMATIC SYSTEM
UF94200
EFFECTIVITY Page 18
ALL
SELF EXAMINATION
What is the purpose of IP/HP switching ?
A - To regulate the output pressure,
depending on Fan Air Valve position.
B - To keep air bleed at a sufficient
pressure at low engine speed.
C - To regulate the output temperature,
depending on the configuration of users.
What is the purpose of the CTS ?
A - To send a pneumatic signal to the OPV,
in case of overpressure.
B - To send a pneumatic signal to regulate
or shut-off the PRV.
What is the purpose of the CT ?
A - To send a pneumatic signal to control
the FAV.
B - To send a pneumatic signal to the OPV in
case of overpressure.
C - To send a pneumatic signal to control
the PRV.
TMUPNEB02 LEVEL 3
EFFECTIVITY 36-10-00 Page 5
Aug 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 36 PNEUMATIC SYSTEM
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