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AVIONICS VENTILATION - SYSTEM INTERFACES
LANDING GEAR CONTROL INTERFACE UNIT (LGCIU)
The Landing Gear Control Interface Unit 1 and 2 send
a signal to the avionics controller for ventilation
system control.
Signal: Ground/flight, used for system control.
ENGINE INTERFACE UNIT (EIU)
The Engine Interface Unit 1 and 2 send the "take-off
thrust on" signal to the avionics controller for
ventilation system control.
Signal: Thrust lever set to take off and N2 above idle,
used for system control.
CENTRALIZED FAULT DISPLAY INTERFACE UNIT (CFDIU)
The avionics controller sends BITE data to the
Centralized Fault Display Interface Unit via ARINC
bus. Test of the system is performed by sending a test
demand discrete signal to the controller.
Signals: BITE data via ARINC bus and MCDU test demand
via discrete, used for avionics equipment ventilation
system monitoring.
SKIN TEMPERATURE SENSOR
The skin temperature sensor signals the skin
temperature to the computer for configuration control.
Signal: Skin temperature, used for configuration
control.
BLOWING PRESSURE SWITCHES AND DUCT TEMPERATURE SENSOR
The blowing pressure switches and the duct temperature
sensor signal a low flow and a high duct temperature
to the controller, to both System Data Acquisition
Concentrators and to the BLOWER pushbutton.
On the ground, the ADIRU & AVNCS VENT light illuminates
amber on the external power receptacle 108VU
accompanied by the horn activation.
Signal: Low pressure delta P = 0.025 psi (1,73 hPa)
or high duct temperature temp = 62oC (144oF), used for
fault and ventilation ground warnings located on
external power receptacle 108VU.
EXTRACT PRESSURE SWITCH
The extract pressure switch signals a low flow to the
controller, to both SDACs and to the EXTRACT
pushbutton.
On the ground, the ADIRU & AVNCS VENT light illuminates
amber on the external power receptacle 108VU
accompanied by the horn activation.
Signal: Extract low pressure, used for fault and
ventilation ground warnings located on external power
receptacle 108VU.
TMUVENB01-T01 LEVEL 3
EFFECTIVITY 21-26-00 Page 2
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 232
ALL
AVIONICS VENTILATION - SYSTEM INTERFACES
TMUVENB01-P01 LEVEL 3
EFFECTIVITY 21-26-00 Page 3
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 233
ALL
AVIONICS VENTILATION - SYSTEM INTERFACES
SKIN AIR VALVES / SDAC
The skin air valves position signals are sent to both
SDACs for system display and for skin valve fault
warning.
Signal: Skin valve position feedback, used for system
display and valve position disagree warning in flight
(SKIN VALVE FAULT).
CONTROLLER (AEVC) / SDAC
The avionics controller monitors the skin air valves
position, the conditioned air inlet valve and the
exchanger inlet bypass valve position.
In case of valve position disagree or loss of power
supply of the controller, the controller sends an
avionics system fault signal to both SDACs.
Signal: Avionics system fault, used for valve position
disagree warning on ground (except the skin exchanger
outlet bypass valve) or loss of power supply of the
Avionics Equipment Ventilation Computer.
SMOKE DETECTOR
The smoke detector signals smoke to the controller,
to both SDACs, to both VENT pushbuttons and to GEN 1
LINE pushbutton.
Signal: Smoke detected, used for smoke warning.
TMUVENB01-T01 LEVEL 3
EFFECTIVITY 21-26-00 Page 4
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 234
ALL
21 - AIR CONDITIONING
21-26-00 AVIONICS VENTILATION -
COMPONENTS
CONTENTS:
Avionics Equipment Ventilation Computer (AEVC)
Skin Air Inlet Valve
Skin Air Outlet Valve
Blower Fan
Extract Fan
Skin Exchanger Inlet Bypass Valve
Skin Exchanger Isolation Valve
Skin Exchanger Outlet Bypass Valve
Conditioned Air Inlet Valve
Filter Assembly
Check Valves
Pressure Switches
Duct Temperature Sensor
Skin Temperature Sensor
Skin Heat Exchanger
TMUVENE0A LEVEL 3
EFFECTIVITY 21-26-00 Page 1
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
　
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