30 Questions
What is the main function of the de-ice fluid discussed in the passage?
To prevent ice formation on the aircraft components
Which component of the aircraft is sprayed with de-icing fluid in the windshield de-ice system?
Windshield
What mechanism is used to control the fluid flow rate in each pump motor?
Rheostat (variable resistor)
Where is the stationary nozzle installed in the propeller de-icing system?
Behind the propeller on the engine nose case
What is the purpose of a slinger ring in the anti-icing system?
To distribute fluid to each propeller blade
What role does a pump play in an anti-icing system?
To deliver fluid to the propeller and nozzles
What is the purpose of the warning light in the cockpit?
To signal when the resonant frequency of the probe has reduced due to ice formation
How is the resonant frequency induced in the coil around the probe?
Through an oscillator
What mechanism keeps the probe heater on for a brief period?
A 5-second time delay
Why does ice formation on the probe lead to a reduction in its resonant frequency?
As a result of added weight from the ice
What happens if ice re-forms within the 55-second period while the warning light remains on?
The process of melting and switching off is repeated
How does the ice shave system in aircraft detect ice formation on the probe?
By detecting a reduction in resonant frequency due to ice
What is the preferred method of ice control for propellers?
Rubber boots with embedded heater wires
How is ice melted on the rubber boots attached to the propeller blades?
By passing electrical current through embedded wires
What is the purpose of the timer unit in the electrical propeller ice control system?
To control the sequence of current to the heater mats
Why are electric elements set in insulating material on the propeller leading edges and spinner?
For de-icing purposes
What is the significance of heating a consistent portion of each blade at the same time?
To aid in de-icing effectiveness
Which component plays a key role in carrying away the loosened ice from the propeller blades?
Centrifugal force
In which type of clouds is structural icing possible at very high altitudes?
Cumuliform clouds with strong updrafts
At what altitude is icing rare due to frozen droplets in clouds?
Between 3,700 m (12,139 ft) and 4,900 m (16,076 ft)
When does the potential for severe icing occur at almost any level?
In cumuliform clouds with strong updrafts
Which classification of ice is formed due to its appearance as clear ice?
Glaze or clear ice
At what temperature range is medium icing categorized?
-15°C to -30°C
What altitude range is specified for most catastrophic inflight icing accidents?
Between 3,700 m (12,139 ft) and 4,900 m (16,076 ft)
What type of power is supplied to the probe heater during testing on the ground?
26-V AC power
Which system controls the air-to-ground mode switch for the heaters?
Aircraft bleed air manifold
What is the purpose of the relays R7421 and R8268 during testing?
To supply power to the probe heater
Which type of power is used by most systems when operating in air mode?
115-V AC power
What is the purpose of the small line directed from the aircraft bleed air manifold?
To provide heated air for anti-icing
Which heaters are designed for continuous operation in freezing flight conditions?
Ribbon Blanket Wrap around patch Gasket heaters
Explore the impact of icing conditions on aircraft near the freezing level in different cloud formations and altitudes. Learn about the most critical altitude ranges for icing accidents and how to stay safe during flight.
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