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conditions (on ground and skin temperature above 11°C
(51.8°F) increasing, or above 4°C (39.2°F)
decreasing).
Note: the skin air inlet and outlet valves are fully
open.
TMUVEN603-T02 LEVEL 3
EFFECTIVITY 21-26-00 Page 4
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TMUVEN603-P02 LEVEL 3
AVIONICS VENTILATION - SYSTEM DESCRIPTION/OPERATION - OPEN CIRCUIT CONFIGURATION
EFFECTIVITY 21-26-00 Page 5
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AVIONICS VENTILATION - SYSTEM DESCRIPTION/OPERATION
CLOSED CIRCUIT CONFIGURATION
In CLOSED CIRCUIT CONFIGURATION, the extracted
avionics equipment air goes, through the skin exchanger
isolation valve, into the skin heat exchanger to be
cooled. then this air is blown into the avionics
equipment again.
When the AEVC detects airflow higher than the requested
value, part of the hot air is bled under the cargo
compartment floor by means of opening of the skin
exchanger inlet ByPass Valve.
the skin exchanger outlet ByPass Valve opens in order
to decrease the noise level in the avionics bay.
TMUVEN603-T03 LEVEL 3
EFFECTIVITY 21-26-00 Page 6
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MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
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TMUVEN603-P03 LEVEL 3
AVIONICS VENTILATION - SYSTEM DESCRIPTION/OPERATION - CLOSED CIRCUIT CONFIGURATION
EFFECTIVITY 21-26-00 Page 7
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MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
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AVIONICS VENTILATION - SYSTEM DESCRIPTION/OPERATION
PARTIALLY OPEN CIRCUIT CONFIGURATION
In PARTIALLY OPEN CIRCUIT CONFIGURATION, the system
is almost like in closed configuration, part of the
extracted air is expelled overboard.
Note that the skin air outlet valve is an electrically
operated single flap with a smaller flap built into
it.
This smaller flap is opened in flight (or on ground
with take-off power selected) when the skin temperature
is above 34°C (93.2°F). It returns to the closed
position when the skin temperature decreases below
27°C (80.6°F).
TMUVEN603-T04 LEVEL 3
EFFECTIVITY 21-26-00 Page 8
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 228
ALL
TMUVEN603-P04 LEVEL 3
AVIONICS VENTILATION - SYSTEM DESCRIPTION/OPERATION - PARTIALLY OPEN CIRCUIT CONFIGURATION
EFFECTIVITY 21-26-00 Page 9
Nov 30/99
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MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
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SELF EXAMINATION
When does the skin exchanger inlet bypass valve
open?
A - In open circuit configuration.
B - In partially open circuit configuration,
or in closed circuit configuration with
airflow higher than the requested value.
C - When the ambient avionics bay
temperature is above 34°C (93.2°F).
When does the skin heat exchanger operate on the
ground?
A - When the circuit operates in open
circuit configuration.
B - In closed circuit configuration when the
skin temperature is below 11°C (51.8°F)
(skin temperature increasing).
C - In closed circuit configuration when the
skin temperature is above 11°C (51.8°F)
(skin temperature increasing).
TMUVEN603 LEVEL 3
EFFECTIVITY 21-26-00 Page 10
Nov 30/99
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MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 230
ALL
21 - AIR CONDITIONING
21-26-00 AVIONICS VENTILATION -
SYSTEM INTERFACES
CONTENTS:
Landing Gear Control Interface Unit (LGCIU)
Engine Interface Unit (EIU)
Centralized Fault Display Interface Unit (CFDIU)
Skin Temperature Sensor
Blowing Pressure Switches And Duct Temperature Sensor
Extract Pressure Switch
Skin Air Valves/SDAC
Controller (AEVC)/SDAC
Smoke Detector
TMUVENB01 LEVEL 3
EFFECTIVITY 21-26-00 Page 1
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 231
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