10 Questions
Which position is the momentary switch used to park the wiper out of view?
Park
What happens when the internal park switch is activated in the windshield wiper circuit?
The motor stops and the wiper is parked
In the windshield washer system, what does the pump do when the washer switch is closed?
Pressurizes the washer fluid
Which component of the windshield washer system distributes fluid to a dispenser on the wiper blades?
Pump
During slow operation of the windshield wiper, what is used to provide higher resistance?
Cam
What is the purpose of the four-position selector switch used in the windshield wiper circuit?
To control wiper speed
When does the wiper circuit switch go back to the off position?
After activating park mode
What initiates the movement of the windshield wiper once activated?
Cam operation
When is a higher resistance value used in the windshield wiper circuit?
'Slow' mode
What provides power to the windshield wiper motor during slow and fast operations?
Selector switch
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.
Learn about the two methods used for ice detection in turbine aeroplane aerodynamics: Visual and Electrical. Discover how visual ice detection is the main form of detection on smaller and older aircraft, along with the use of black witness marks.
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