Ice and Rain Control System

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

• Hot air

• A brush or a squeegee

• Warm water

• Chemical deicing fluid

Answer explanation

A brush or a squeegee is the best means to remove wet snow from an aircraft as it effectively clears the snow without damaging the surface, unlike hot air or warm water which may not be as efficient.

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

• Injector ice

• Inlet ice

• Carburetor ice

• Rime ice

Answer explanation

Carburetor ice can form even when no visible moisture is present, as it occurs due to the cooling effect of fuel vaporization in the carburetor. This can lead to engine performance issues, making it a critical condition to monitor.

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

• Autotransformer, heat control relay, heat control toggle switch, 115V DC power supply, and indicating light

• Heat control relay, heat control toggle switch, 24V DC power supply, and indicating light

• Autotransformer, heat control relay, heat control toggle switch, and indicating light

• Thermostat, 28V DC bus, and heating grid

Answer explanation

The correct choice includes an autotransformer, heat control relay, heat control toggle switch, and indicating light, which are essential components in a laminated integral electrically heated windshield system.

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

• Whenever icing conditions are first encountered or expected to occur

• Only after ice has built up 1/2 inch

Answer explanation

The anti-ice system is activated whenever icing conditions are first encountered or expected to occur to prevent ice accumulation, ensuring safe flight operations.

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

• Constant pressure and vacuum readings

Answer explanation

During a normal operational check of a pneumatic deicer system, the pressure gauge fluctuates as the deicer boots inflate and deflate, while the vacuum gauge remains relatively steady, indicating proper system function.

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

• On the outside surface

Answer explanation

The heating elements in most aircraft with electrically heated windshields are laminated in the glass. This integration allows for efficient heating without obstructing visibility, making it the correct choice.

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

• First stage of the aircycle turbine and turbo compressor

• Compressor bleed air and aircraft electrical system

• Combustion heater and exhaust gases

• Ram air and engine oil

Answer explanation

The correct choice is 'Compressor bleed air and aircraft electrical system' as these sources provide the necessary heat for the wing thermal anti-icing system, ensuring effective operation in cold conditions.

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

• Thermal overheat switches

• Thermistors

• Manually-controlled rheostat

• Circuit breakers

Answer explanation

Thermistors are temperature-sensitive resistors that monitor and regulate the temperature in an electrically heated windshield system, ensuring optimal performance and preventing overheating.

What system component aids in the prevention of carburetor icing?

• Alcohol injection nozzle

• Bleed air valve

• Air diverter butterfly

• Fuel heater

Answer explanation

The alcohol injection nozzle helps prevent carburetor icing by introducing alcohol into the fuel-air mixture, which lowers the freezing point and reduces the likelihood of ice formation in the carburetor.

What are three methods of anti-icing aircraft windshields?

• An electric heating element in the windshield, a heated air circulating system, and 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

• Chemical coating, vibration, and hot air

Answer explanation

The correct choice includes an electric heating element in the windshield, a heated air circulating system, and windshield wipers with anti-icing fluid, which are effective methods for preventing ice formation on aircraft windshields.