Inflight Icing Conditions Quiz

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What is the function of the rheostat in the de-ice system?

To change the direction of fluid spray

To adjust the fluid flow rate

To mix anti-icing fluid with de-icing fluid

To control the speed of the pump motor (correct)

Where is the anti-icing fluid sprayed in the propeller de-ice system?

Just behind the propeller on the engine nose case (correct)

Into the carburettor air intake

On the blade edges

Over the windshield

How is fluid delivery to the propeller blades achieved in the de-ice system?

From a storage tank through plumbing

Through a porous boot fixed to the leading edges

Via a circular U-shaped channel called a slinger ring (correct)

By an electric motor driving a pump

What is the purpose of the slinger ring in the anti-icing system for the propeller?

To evenly distribute fluid to each blade Signup and view all the answers

In which de-ice system is fluid slowly released through a porous boot fixed to the leading edges?

Wing and empennage de-ice system Signup and view all the answers

What component in the anti-icing system allows for adjusting the pump output?

Rheostat Signup and view all the answers

What is the purpose of an anti-ice system on an aircraft?

To prevent the formation of ice Signup and view all the answers

How do de-ice boots work on aircraft?

By applying vacuum pressure to hold the boot against the aerofoil when not in use Signup and view all the answers

What is the function of inflatable boots on an aircraft's leading edges?

To break and remove ice accumulation Signup and view all the answers

How are inflatable boots usually constructed?

With separate air passages or chambers Signup and view all the answers

Which principle allows the inflatable boots to be held hard against the aerofoil when not in use?

Venturi effect Signup and view all the answers

What type of pressure is applied to the inflatable tubes when the de-icing system is not in use?

Vacuum pressure Signup and view all the answers

Where are the worst continuous icing conditions typically found?

Between 12,000 - 16,000 ft near the freezing level Signup and view all the answers

In which type of cloud can strong updrafts carry large water droplets to higher altitudes?

Cumuliform clouds Signup and view all the answers

At what altitude is icing rare due to frozen droplets in the clouds?

Above 30,000 ft Signup and view all the answers

When is severe icing most likely to occur in cumuliform clouds?

When large water droplets are carried to higher altitudes Signup and view all the answers

What is the result of the freezing level being distorted upwards in cumuliform clouds?

Increased possibility of severe icing at any level Signup and view all the answers

How is ice classified based on its formation and appearance?

Into three standard classifications: Glaze, Rime, Mixed ice Signup and view all the answers

What is the purpose of the load meter described in the text?

To monitor the operation of the system Signup and view all the answers

How is power supplied to each heater element connected to the propeller?

Through brush block and slip rings Signup and view all the answers

Why is it important for each heater element to draw the required amount of current?

To ensure effective anti-icing Signup and view all the answers

What could happen if heat is applied for too long to the heating mat?

System damage due to delamination Signup and view all the answers

How is power delivered to the heater element after the timer unit supplies it?

Through slip rings and brush block Signup and view all the answers

What is a common source of warm air used for anti-icing in turbine-engine aircraft?

Compressor bleed air Signup and view all the answers

What component determines the stroke arc required by the wiper blades in an aircraft?

Converter Signup and view all the answers

Which component of the aircraft wiper system governs the wiper pattern?

Guide arm Signup and view all the answers

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 Signup and view all the answers

What is used to support the spring tension for easy removal/installation of the wiper system in an aircraft?

Steel pin or drill Signup and view all the answers

Which component attaches to the serrated shaft of the converter in an aircraft wiper system?

Drive arm Signup and view all the answers

What connects the DC motor to each converter in an aircraft's wiper system?

Flexible drive shaft Signup and view all the answers