*
Shield -moves the wiper blade off of the windshield
*
Bumper -stops the wipe arm in the park position and sets the wiper blade pivot mechanism to the park position.
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WINDSHIELD WIPER SYSTEM -WIPERS, LIFT BLOCKS, AND HYDROPHOBIC COATING
Hydrophobic Coating
The word hydrophobic means to repel or not absorb water. The windshield hydrophobic coating is on the external surface of the left and right number one flight deck windows (windshields). The coating causes raindrops to bead up and roll off, this allows you to see through the windshield with very little distortion.
Training Information Point
WARNING: BEFORE YOU DO MAINTENANCE ON THE WINDSHIELD WIPER SYSTEM, OPEN THE WINDOW HEAT CIRCUIT BREAKERS. IF YOU DO NOT OPEN THESE CIRCUIT BREAKERS YOU CAN GET AN ELECTRICAL SHOCK WHEN YOU TOUCH THE WINDOW.
CAUTION: DO NOT LIFT THE ARM ASSEMBLY MORE THAN
0.5 INCH. YOU CAN CAUSE DAMAGE TO THE ARM ASSEMBLY AND MAKE IT UNSERVICEABLE.
CAUTION: DO NOT OPERATE THE WIPER ON A DRY
WINDSHIELD. YOU CAN DAMAGE THE
WINDSHIELD.
CAUTION: DO NOT USE ABRASIVE CLEANERS OR CLEANER THAT CONTAIN FLUORIDES ON HYDROPHOBIC COATING.
NOTE: Do not apply polish or wax to the windows that have a hyprophobic coating.
You should use a 50/50 solution of isopropanol alcohol and de-ionized or distilled water applied with as soft cloth or non-abrasive paper towel to clean the windshields.
Particles can be removed from coated windows with the cleaning solution and a plastic cleaning pad. When using a cleaning pad, extreme care must be taken that the removed particles do not become caught in the pad and become a potential cause of scratches in the coating or glass.
The life of the hyprophobic coating is affected by wiper blade tension. If the tension is too high, the coating will wear off quickly.
See the servicing section in part II of the AMM (12-16-02) and the Boeing maintenance TIP 777-MT-30-002 for more information about cleaning the flight compartment windows.
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WINDSHIELD WIPER SYSTEM -WIPERS, LIFT BLOCKS, AND HYDROPHOBIC COATING
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D633W101-BEJ Jan 05/2002
WINDSHIELD WIPER SYSTEM -FUNCTIONAL DESCRIPTION
Functional Description
The control circuits for the left and right windshield wipers are similar, the left circuit is shown. The wiper selector supplies mode selection information to the motor/converter. The motor/ converter operates and controls the mode of operation for the windshield wiper. The motor/converter supplies these modes:
*
OFF, sets the wiper to the park position
*
INT, sets the wiper to operate 1 cycle every 7 seconds
*
LOW, sets the wiper to operate 160 cycles per minute
*
HIGH, sets the wiper to operate 250 cycles per minute.
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WINDSHIELD WIPER SYSTEM -FUNCTIONAL DESCRIPTION
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WINDSHIELD WIPER SYSTEM -OPERATION
Wiper Selectors
The wiper selectors are on the wiper panel (P5).
Each selector has these positions:
*
OFF
*
INT
*
LOW
*
HIGH.
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777 AIRCRAFT MAINTENANCE MANUAL
WINDSHIELD WIPER SYSTEM -OPERATION
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777 AIRCRAFT MAINTENANCE MANUAL
THIS PAGE IS INTENTIONALLY LEFT BLANK
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Page 1 D633W101-BEJ Jan 05/2002
LANDSCAPE CAMERA WINDOW HEAT -INTRODUCTION
Purpose
The landscape camera window heat system prevents ice on the landscape camera window.
General Description
An electric heating film in the window lamination supplies heat to the window.
The window heat switch for the left forward flight compartment window enables landscape camera window heat.
A temperature switch controls power to the heating film. A spring holds the temperature switch against the window.
Training Information Point
The wires for the window heating film do not have electrical connectors. To replace the window, you must splice the wires from the window to the airplane wires.
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