2. Component Location
__________________ R (Ref. Fig. 001, 002)
R -------------------------------------------------------------------------------R FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA R | | | | DOOR | REF. R -------------------------------------------------------------------------------R 2DG1 WHC-1 121 811 30-42-34 R 3DG1 WINDSHIELD-L 211 811 56-11-11 R 7DG1 WINDOW-FIXED, L 211 811 56-11-12 R 8DG1 WINDOW-SLIDING, L 211 811 56-12-11 R 2DG2 WHC-2 122 811 30-42-34 R 3DG2 WINDSHIELD-R 212 811 56-11-11 R 7DG2 WINDOW-FIXED, R 212 811 56-11-12 R 8DG2 WINDOW-SLIDING, R 212 811 56-12-11
3. System Description
__________________ R (Ref. Fig. 003) R Two temperature sensors (or optionally three depending on the windshield R part number), are installed inside each windshield (one sensor active, the R other(s) spare). R Two temperature sensors (one is in spare, which can be used permanently if R the first one fails) are installed in each of the fixed and sliding side R windows. R The regulation threshold of the WHC is between 35 and 42 deg.C (95 and 107.6 R deg.F). The temperature is monitored by the in-service sensor.
Windshield Anti-icing and Defogging - Control Location
Figure 001
Windshield Anti-icing and Defogging - WHC Location
Figure 002
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Windshield Anti-icing and Defogging - Schematic
Figure 003
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R Two heating power levels are available for the windshield:
R - 23 W/dm2 on the ground,
R - 70 W/dm2 in flight only (not allowed on the ground).
R A 200 VAC/400 Hz line delivers these power outputs on the ground and in
R flight.
R One heating power level only is available for the windows: 15 W/dm2 on the
R ground as well as in flight.
R A 115 VAC/400 Hz line delivers this power output.
R Detection of window extreme temperatures or failure of associated
R temperature sensor causes:
R - activation of a warning in the cockpit,
R - automatic cut off of the heating of the defective window.
R These extreme temperatures are given below:
R - +60 deg.C (140 deg.F): corresponds to an overheat or to the sensor in open
R circuit,
R - -60 deg.C (-76 deg.F): corresponds to the sensor in short circuit.
R NOTE : A lighted icing indicator is installed on the outer face of the____
R windshield post to indicate the presence of ice.
4. Power Supply____________
R (Ref. Fig. 004, 005)
R The supply and protection of the components and functions is given below:
R -------------------------------------------------------------------------------
R |COMPONENT/FUNCTION | CIRCUIT BREAKER | BUSBAR |
R |------------------------------------------|---------------------|------------|
R | Heating of L windshield | 1DG1 | 1XP |
R | Heating of R windshield | 1DG2 | 2XP |
R | Heating of L windows (fixed and sliding) | 4DG1 | 101XP-B |
R | Heating of R windows (fixed and sliding) | 4DG2 | 202XP-C |
R | Supply of WHC1 | 5DG1 | 101PP |
R | Supply of WHC2 | 5DG2 | 202PP |
R -------------------------------------------------------------------------------
5. Interface_________
R The windshield anti-icing and defogging system is related to the systems
R given below:
R - the Engine Interface Vibration Monitoring Unit (EIVMU) (Functional
R Interfaces) to ensure the heating control,
R - the landing gear shock-absorbers to ensure the selection of the heating
R mode (for the windshield),
R - the Centralized Fault Display Interface Unit (CFDIU),
R - the System Data Acquisition Concentrator (SDAC).
Anti-icing and Defogging - L Windshield and Windows - Schematic
Figure 004
Anti-icing and Defogging - R Windshield and Windows - Schematic
Figure 005
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