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one windshield and two windows (one fixed and one
sliding).
CONTROL
Windshield and windows heating comes on automatically
when at least one engine is running.
It can also be manually activated by the "PROBE/WINDOW
HEAT" pushbutton.
The windshield heating operates at low power on the
ground and high power in flight.
WINDOW HEAT COMPUTER (WHC)
Temperature regulation, overheat protection and
fault indication are provided by each Window Heat
Computer (WHC).
In case of a windshield or a window heating fault,
the Window Heat Computer (WHC) sends an output to
ECAM via the System Data Acquisition Concentrator
(SDAC).
The WHCs also transmit fault messages to the
Centralized Fault Display Interface Unit (CFDIU).
CAUTION
Pulling the Engine Interface Unit (EIU) power supply
circuit breakers causes the unwanted heating of the
windshield and the side windows.
TMUICE401-T01 LEVEL 1
EFFECTIVITY 30-42-00 Page 2
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 30 ICE & RAIN PROTECTION
UF94200
EFFECTIVITY Page 60
ALL
WINDOWS ANTI-ICING AND DEFOGGING SYSTEM PRESENTATION
TMUICE401-P01 LEVEL 1
EFFECTIVITY 30-42-00 Page 3
Aug 31/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
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EFFECTIVITY Page 61
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SELF EXAMINATION
What happens in case of a WHC failure ?
A - The failed WHC connects to the other.
B - Both systems are lost.
C - The heating of the related side is lost.
What happens when the EIU power supply circuit
breakers are pulled ?
A - Nothing happens.
B - The windshield heating is cut off.
C - The windshield and windows are heated.
TMUICE401 LEVEL 1
EFFECTIVITY 30-42-00 Page 4
Aug 31/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 30 ICE & RAIN PROTECTION
UF94200
EFFECTIVITY Page 62
ALL
30 - ICE AND RAIN PROTECTION
30-42-00 WINDOWS ANTI-ICING AND DEFOGGING
SYSTEM DESCRIPTION AND OPERATION
CONTENTS:
General
Power Supply
Control
Computer
Users
Engine Relays
Landing Gear Control and Interface Unit (LGCIU)
System Data Acquisition Concentrator (SDAC)
Centralized Fault Display Interface Unit (CFDIU)
TMUICEZ01 LEVEL 3
EFFECTIVITY 30-42-00 Page 1
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 30 ICE & RAIN PROTECTION
UF94200
EFFECTIVITY Page 63
ALL
WINDOWS ANTI-ICING AND DEFOGGING SYSTEM DESCRIPTION AND OPERATION
GENERAL
The window and windshield anti-icing and demisting
system is designed to maintain clear visibility through
the cockpit front and side windows in icing or misting
conditions.
Windshields are de-iced, sliding and fixed windows are
dimisted.
POWER SUPPLY
Each WHC, windshield and one side windows have their
own power supply.
The WHC is supplied with 28 Volts DC. The windows are
supplied with 115 Volts AC. The windshield is supplied
with a dual phase of 115 Volts AC.
CONTROL
The heating is cut off when the three ground signals
are sent to the AND logic.
The windshield and windows are heated either when one
engine is running or when the PROBE/WINDOW HEAT
pushbutton is set to "ON".
COMPUTER
Each WHC ensures the monitoring of its system. It
identifies and memorizes the faulty component.
It also incorporates protection against overvoltage
due to lightning strike and to static electricity on
the windows. The WHC provides independent temperature
regulation between 35 and 42°C (95 and 107.6°F).
Safety : Heating is cut off if temperature reaches +60
or -60°C (140 or -76°F).
USERS
Each window and each windshield comprises a heating
element and two single loop sensors. One of the two
sensors is a spare.
ENGINE RELAYS
OIL LOW PRESSURE AND GROUND relays are energized by
the Engine Interface Unit (EIU) when the related engine
is not running.
If you have to pull the EIU circuit breakers, the
related ENGINE OIL LOW PRESS AND GROUND relays are
deenergized, this will cause windshield and windows
to be heated.
LANDING GEAR CONTROL AND INTERFACE UNIT (LGCIU)
LGCIUs inputs are used for the two heating levels of
the windshield.
When flight configuration is detected, the windshield
is fully heated by the dual phase.
SYSTEM DATA ACQUISITION CONCENTRATOR (SDAC)
　
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