AF Ice and Rain Control Systems

Prior to installation of a pneumatic surface-bonded type deicer boot, on the leading edge of the wing, you should

remove all paint from the area to be covered by the deicer boot.
clean the surface with MEK and apply adhesive to the back of the deicer boot and leading edge of the wing.
rough the surface with a mild abrasive.

Which of the following are found in a laminated integral electrically heated windshield system?

Autotransformer, heat control relay, heat control toggle switch, and indicating light.
Heat control relay, heat control toggle switch, 24V DC power supply, and indicating light.
Autotransformer, head control relay, heat control toggle switch, and indicating light.

What is one check for proper operation of a pitot static tube heater after replacement?

Ammeter reading.
Voltmeter reading.
Continuity check of system.

What controls the inflation sequence in a pneumatic deicer boot system?

Shuttle valve.
Vacuum pump.
Distributor valve.

What is the source of pressure for inflating deicer boots on reciprocating engine aircraft?

Vane-type pump.
Gear-type pump.
Piston-type pump.

Which of the following regulates the vacuum of the air pump to hold the deicing boots deflated when the pneumatic deicing system is off?

Distribution valve.
Pressure regulator.
Suction relief valve.

What may be used to clean deicer boots?

Unleaded gasoline or Jet A fuel.
Naphtha.
Soap and water.

Some aircraft are protected against airframe/icing by heating the leading edges of the airfoils and intake ducts. When is this type of anti-ice system usually operated during flight?

Continuously while the aircraft is in flight.
In symmetric cycles during icing conditions to remove ice as it accumulates.
Wherever icing conditions are first encountered or expected to occur.

Which of the following indications occur during a normal operational check of a pneumatic deicer system?

Relatively steady readings on the pressure gauge and fluctuating readings on the vacuum gauge.
Fluctuating readings on the pressure gauge and relatively steady readings on the vacuum gauge.
Pressure and vacuum gauges will fluctuate as the deicer boots inflate and deflate.

What method is usually employed to control the temperature of an anti-icing system using surface combustion heaters?

Thermo-cycling switches.
Thermostats in the cockpit.
Heater fuel shutoff valves.

What is the purpose of the distributor valve in a deicing system utilizer deicer boots?

To equalize the air pressure to the left and right wings.
To sequence the deicer boots inflations symmetrically.
To distribute anti-icing fluid to the deicer boots.

What is the purpose of the oil separator in the pneumatic deicing system?

To protect the deicer boots from oil deterioration.
To remove oil from air exhausted from the deicer boots.
To prevent an accumulation of oil in the vacuum system.

Where are the heating elements located on most aircraft with electrically heated windshields?

Laminated in the glass.
Attached to the glass.
Inside the windshield frame.

Two possible sources of heat for the operation of a wing thermal anti-icing system are

first stage of the air cycle turbine and turbo compressor.
compressor bleed air and aircraft electrical ssytem.
combustion heater and exhaust gases.

What maintains normal windshield temperature control in an electrically heated windshield system?

Thermal overheat switches.
Thermistors.
Manually-controlled rheostat.

Arcing in an electrically heated windshield panel usually indicates a breakdown in the

temperature-sensing elements.
autotransformers.
conductie coating.

Which of the following connects vacuum to the deicer boots when the system is not in operation, to hold the boots tightly against the leading edges in flight?

Vacuum relief valve.
Ejector.
Distributor valve.

How do deicer boots help remove ice accumulations?

By preventing the formation of ice.
By breaking up ice formations.
By allowing only a thin layer of ice to build up.

Why are the tubes in deicer boots alternately inflated?

Alternate inflation of deicer boot tubes keeps disturbance of the airflow to a minimum.
Alternate inflation of deicer boot tubes does not disturb airflow.
Alternate inflation of deicer boot tubes relieves the load on the air pump.

What system component aids in the prevention of carburetor icing?

Alcohol injection nozzle.
Bleed air valve.
Air diverter butterfly.

Why should a chemical rain repellant not be used on a dry windshield?

It will etch the glass.
It will restrict visibility.
It will cause glass crazing.

What is the principle characteristic of a windshield pneumatic rain removal system?

An air blast spreads a liquid rain repellant evenly over the windshield that prevents raindrops from cliinging to the glass surface.
An air blast forms a barrier that prevents raindrops from striking the windshield surface.
A pneumatic rain removal system is simply a mechanical windshield wiper system that is powered by pneumatic system pressure.

What mixture may be used as a deicing fluid to remove frost from an aircraft surface?

Ethylene glycol and isopropyl alcohol.
Methyl ethyl ketone and ethylene glycol.
Naphtha and isopropyl alcohol.

Which of the following is the best means to use when removing wet snow from an aircraft?

A brush or a squeegee.
Hot air.
Warm water.

What are three methods of anti-icing aircraft windshields?

An electric heating element in the windshield, a heated air circulating system, windshield wipers, and anti-icing fluid.
A blanket-type heating system, an electric heating element in the windshield, and a ribbon-type heating system.
An electric heating element in the windshield, a heated air circulating system, and a hot water system.

What icing condition may occur when there is no visible moisture present?

Injector ice.
Inlet ice.
Carburetor ice.

What should be used to melt the ice in a turbine engine if the compressor is immobile because of ice?

Deicing fluid.
Anti-icing fluid.
Hot air.

What is used as a temperature-sensing element in an electrically heated windshield?

Thermocouple.
Thermistor.
Thermometer.

AF Ice and Rain Control Systems

Jon K

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