30 Questions
What is the function of the rheostat in the de-ice system?
To control the speed of the pump motor
Where is the anti-icing fluid sprayed in the propeller de-ice system?
Just behind the propeller on the engine nose case
How is fluid delivery to the propeller blades achieved in the de-ice system?
Via a circular U-shaped channel called a slinger ring
What is the purpose of the slinger ring in the anti-icing system for the propeller?
To evenly distribute fluid to each blade
In which de-ice system is fluid slowly released through a porous boot fixed to the leading edges?
Wing and empennage de-ice system
What component in the anti-icing system allows for adjusting the pump output?
Rheostat
What is the purpose of an anti-ice system on an aircraft?
To prevent the formation of ice
How do de-ice boots work on aircraft?
By applying vacuum pressure to hold the boot against the aerofoil when not in use
What is the function of inflatable boots on an aircraft's leading edges?
To break and remove ice accumulation
How are inflatable boots usually constructed?
With separate air passages or chambers
Which principle allows the inflatable boots to be held hard against the aerofoil when not in use?
Venturi effect
What type of pressure is applied to the inflatable tubes when the de-icing system is not in use?
Vacuum pressure
Where are the worst continuous icing conditions typically found?
Between 12,000 - 16,000 ft near the freezing level
In which type of cloud can strong updrafts carry large water droplets to higher altitudes?
Cumuliform clouds
At what altitude is icing rare due to frozen droplets in the clouds?
Above 30,000 ft
When is severe icing most likely to occur in cumuliform clouds?
When large water droplets are carried to higher altitudes
What is the result of the freezing level being distorted upwards in cumuliform clouds?
Increased possibility of severe icing at any level
How is ice classified based on its formation and appearance?
Into three standard classifications: Glaze, Rime, Mixed ice
What is the purpose of the load meter described in the text?
To monitor the operation of the system
How is power supplied to each heater element connected to the propeller?
Through brush block and slip rings
Why is it important for each heater element to draw the required amount of current?
To ensure effective anti-icing
What could happen if heat is applied for too long to the heating mat?
System damage due to delamination
How is power delivered to the heater element after the timer unit supplies it?
Through slip rings and brush block
What is a common source of warm air used for anti-icing in turbine-engine aircraft?
Compressor bleed air
What component determines the stroke arc required by the wiper blades in an aircraft?
Converter
Which component of the aircraft wiper system governs the wiper pattern?
Guide arm
How is the spring tension against the windshield obtained in the aircraft wiper system?
By adjusting a screw near the bottom of the drive arm
What is used to support the spring tension for easy removal/installation of the wiper system in an aircraft?
Steel pin or drill
Which component attaches to the serrated shaft of the converter in an aircraft wiper system?
Drive arm
What connects the DC motor to each converter in an aircraft's wiper system?
Flexible drive shaft
Test your knowledge on inflight icing conditions, including the worst conditions near the freezing level in heavy stratified clouds. Learn about the altitude range where most catastrophic inflight icing accidents occur and the difference in icing risks between stratiform and cumuliform clouds.
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