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valve and RAM air inlet flap positions.
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ZONE TEMPERATURE CONTROL - ZONE AND PACK CONTROLLER INTERFACES
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ZONE TEMPERATURE CONTROL - ZONE AND PACK CONTROLLER INTERFACES
CENTRALIZED FAULT DISPLAY INTERFACE UNIT (CFDIU)
The zone controller sends BITE data to the Centralized
Fault Display Interface Unit for system monitoring.
Signal:BITE data, used for temperature control system
monitoring.
ZONE AND PACK CONTROLLERS
The pack controllers mainly receive temperature
demand, flow demand and CFDIU control signals from the
zone controller and send back maintenance data signals.
Zone controller to pack controllers:
- Signal: Temperature demand, zone controller
status, pack ARINC reception status, aircraft
altitude, APU bleed valve position, used for
pack temperature control.
- Signal: Flow demand, used for flow control.
- Signal: BITE command, for CFDIU.
Pack controllers to zone controller:
- Signal: pack control status, zone ARINC
reception status, BITE information, used for
temperature control system monitoring.
FANS PARAMETERS
The zone controller receives discrete signals from
recirculation and toilet fans for monitoring.
Signal: recirculation, toilet and galley and AFT cargo
ventilation fans operation, used for monitoring for
transmission to SDACs and CFDIU.
ANTI-ICE AND PNEUMATIC PARAMETERS
Anti-ice and pneumatic parameters are used to detect
faults and to ascertain the status of the bleed air
system for transmission to CFDIU and EIUs.
Signals: valve positions, low and high pressure,..
etc..., used for anti-ice system fault detection for
the CFDIU and thrust limit calculation for the EIUs.
LANDING GEAR CONTROL INTERFACE UNIT 2 (LGCIU 2)
The Landing Gear Control Interface Unit 2 sends a
GROUND/FLIGHT signal to both pack controllers for pack
RAM air inlet flap operation.
Signal: ground/flight, used for pack RAM air inlet
flap closure during take-off and landing phases.
BRAKING AND STEERING CONTROL UNIT (BSCU)
The BSCU sends a wheel speed signal to both pack
controllers for pack RAM air inlet flap operation.
Signal: wheel speed, used for pack RAM air inlet flap
closure during take-off and landing phases.
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SELF EXAMINATION
The pack controllers send to the zone controller:
A - The flow demand signal.
B - The BITE demand signal.
C - BITE information and pack status signals.
To close the pack RAM air inlet flap, the pack
controller needs information from:
A - The ECB.
B - The anti-ice system.
C - LGCIU 2, BSCU and EIUs.
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21 - AIR CONDITIONING
21-55-00 ZONE TEMPERATURE CONTROL -
EMERGENCY RAM AIR INLET OPERATION
CONTENTS:
General
Emergency Ram Air Inlet Flap Operation
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ZONE TEMPERATURE CONTROL - EMERGENCY RAM AIR INLET OPERATION
GENERAL
The aircraft is equipped with one emergency ram air
inlet flap located at the lower left-hand side of the
fuselage, sharing the same duct with the low pressure
ground connection.
EMERGENCY RAM AIR INLET FLAP OPERATION
In case of failure of both packs, an emergency ram air
inlet flap can be opened for aircraft ventilation or
smoke removal.
In case of smoke removal or loss of both packs, the
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