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Questions and Answers
Which position is the momentary switch used to park the wiper out of view?
Which position is the momentary switch used to park the wiper out of view?
- Slow
- Park (correct)
- Fast
- Off
What happens when the internal park switch is activated in the windshield wiper circuit?
What happens when the internal park switch is activated in the windshield wiper circuit?
- The wiper reverses direction
- The motor stops and the wiper is parked (correct)
- The motor switches to slow operation
- The wiper speeds up
In the windshield washer system, what does the pump do when the washer switch is closed?
In the windshield washer system, what does the pump do when the washer switch is closed?
- Activates the wipers
- Stops operating
- Deactivates the reservoir
- Pressurizes the washer fluid (correct)
Which component of the windshield washer system distributes fluid to a dispenser on the wiper blades?
Which component of the windshield washer system distributes fluid to a dispenser on the wiper blades?
During slow operation of the windshield wiper, what is used to provide higher resistance?
During slow operation of the windshield wiper, what is used to provide higher resistance?
What is the purpose of the four-position selector switch used in the windshield wiper circuit?
What is the purpose of the four-position selector switch used in the windshield wiper circuit?
When does the wiper circuit switch go back to the off position?
When does the wiper circuit switch go back to the off position?
What initiates the movement of the windshield wiper once activated?
What initiates the movement of the windshield wiper once activated?
When is a higher resistance value used in the windshield wiper circuit?
When is a higher resistance value used in the windshield wiper circuit?
What provides power to the windshield wiper motor during slow and fast operations?
What provides power to the windshield wiper motor during slow and fast operations?
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Study Notes
Ice Detection Methods
- There are two methods of ice detection: visual and electrical.
- Visual detection is used on smaller and older aircraft.
- Visual detection uses leading-edge lights to shine on black witness marks, which become more reflective and harder to see when ice builds up.
- Ice buildup on windshield wipers is also a visual indicator of icing conditions.
Electrical Ice Detection
- Electrical detection methods include:
- Pressure
- Ice shave
- Frequency
- Frequency probe system uses a probe with small air inlet holes and a large air inlet hole to detect changes in air pressure.
Anti-Icing and De-Icing Systems
- Ice control systems can be categorized into:
- De-ice systems (remove ice after it forms)
- Anti-ice systems (prevent ice formation)
- De-icer boots are used on piston-powered and turbine-powered propeller aircraft.
- De-icer boots have inflatable chambers that can be inflated and deflated to remove ice.
Windshield Wipers and Washers
- Windshield wipers can be operated independently of each other.
- Converters change the rotary motion of the motor to the oscillating motion required by the wiper blades.
- The converter determines the stroke arc of the wiper blades.
- Windshield washers use a switch, reservoir, and pump to distribute washer fluid to the wiper blades.
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