FLIGHT DECK WINDOW ANTI-ICE SYSTEM -SYSTEM TESTS

General
These are the flight deck window anti-ice system tests that show when you select ATA 30 Window Heat Control System:
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Window heat control unit -L

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Window heat control unit -R.

Left and Right Window Heat Control Unit
These tests make sure that the related window heat control unit operates correctly.
During the test, the window heat control unit applies power to the related flight deck window. The tests each take approximately 1-2 minutes.
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FLIGHT DECK WINDOW ANTI-ICE SYSTEM -SYSTEM TESTS

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WINDSHIELD WIPER SYSTEM -INTRODUCTION

Purpose
The windshield wiper system removes water from the left and right number one flight deck windows.
Windshield Wipers
There are two windshield wipers, one for each of the number one windows. Each windshield wiper assembly has these components:
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Wiper

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Wiper arm

* Wiper motor/converter. There is a switch on the P5 overhead panel for each wiper. Hydrophobic Coating
A hydrophobic coating on each forward window repels rain. The windshield does not have a liquid rain repellent system because there is a hydrophobic coating.
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WINDSHIELD WIPER SYSTEM -INTRODUCTION

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WINDSHIELD WIPER SYSTEM -COMPONENT LOCATION

Wiper Panel
The left and right wiper panels are on the lower part of the P5 overhead panel.
Windshield Wipers
The windshield wipers are forward of the windshields.
Windshield Wiper Lift Block Assemblies
The lift blocks are forward and below the windshields.
Hydrophobic Coating
The hydrophobic coating is on the outside surface of the windshields (left and right number one windows).
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WINDSHIELD WIPER SYSTEM -COMPONENT LOCATION

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WINDSHIELD WIPER SYSTEM -WIPERS, LIFT BLOCKS, AND HYDROPHOBIC COATING

Purpose
The left and right windshield wiper systems remove precipitation from the windshields.
The windshield wiper lift blocks make the wiper blades move up and off of the windshields when the wiper arms go to the park (OFF) position. The blocks also push on the lock levers to make the wiper blades go to the park (OFF) position.
The hydrophobic windshield coating reduces the need for wipers and gives the flight crew better visibility during heavy rain (0.6 inch of rain or more per hour).
Windshield Wiper
The windshield wiper system has these components:
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Wiper motor/converter

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Wiper arm assembly

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Wiper blade

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Lift block bumper.

All components are LRUs. You access the components from outside the airplane.
The motor/converter has these parts:
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Gear assembly, internal

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28v dc motor, internal

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Two printed circuit (PC) cards, internal

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Housing

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Output shaft

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Electrical connector.

The unit has an approximate weight of 11 pounds (4.1 kg). The PC cards control the motor. The gear assemblies connect the motor to the output shaft. The gears reduce output speed and increase torque to the output shaft. The output shaft gives a place to connect the wiper arm assembly.
The wiper arm assembly has these parts:
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Adapter -connects the arm to the output shaft of the motor/ converter and you use it to adjust wiper arm tension

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Arm -supplies a rigid link between the motor/converter and the wiper blade

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Wiper blade pivot mechanism -moves the wiper blade to the park position and supplies a place to attach the wiper blade.

The wiper blade has a rigid part that attaches to the wiper arm and a soft part that wipes precipitation from the windshield.
　
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