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OP Ice & Rain

QuestionAnswer
What controls the temperature in a thermal anti icing system? Hot and cold air are mixed.
What are the sources of heat for thermal anti-icing systems? Bleed air from engine compressor exhaust heat exchangers, combustion heaters.
What prevents overheating of the leading edges of a thermal anti-ice system operated by bleed air? Overheat sensors signal anti ice valves to close and shut off the hot air.
What happens to the hot air used by a thermal anti-ice system after it has heated the surface? Air is dumped overboard.
Why is it necessary to provide overheat protection for anti icing systems that use turbine engine bleed air? The air is hot enough to cause damage to aircraft structure.
What are the effects of arcing on an electrically heated windshield? Localized overheating and damage to the windshield.
Can the operation of an electrically heated pitot tube be checked with aircrafts ammeter, and if so how? Yes turn the pitot heater on and observe the deflection of the ammeter needle.
Describe several potential problems associated with electrically heated windshields? Arcing, delamination, scratches, discoloration.
Why do some pneumatically deicer boot systems have an electrically operated timer? To properly cycle the boots, allow adequate rest time and re cycle the boots.
What are the two common methods of inflating de icer boots? Bleed air from turbine engine or exhaust of engine driven vacuum pump.
What procedure is used to hold deicer boots flat with the airfoil surface during flight? Suction is applied to the boots.
Why do some deicer boot systems incorporate an oil separator? On wet pump systems oil must be removed before the boot to stop the boot from being deteriorated.
What methods are used to attach a deicer boot to the leading edges of the wing and tail surfaces? Adhesives, Bearing strips and screws or combination of both.
What important step should be taken prior to making a cold patch repair to a deicer boot? Consult the manufacturers service manual and follow the repair instructions explicitly.
Describe the common methods to remove rain from a windshield? Windshield wipers, a blast of air, chemical repellant.
What power sources are used to operate windshield motors? Electricity or hydraulic pressure.
Name two problems with in flight operation of aircraft windshield wipers? Insufficient blade pressure due to aerodynamic forces and failure to oscillate fast enough.
Describe the operation of a pneumatic rain removal system? A high velocity air blast prevents the rain from reaching the surface of the windshield.
What are the effects of spraying rain repellant on the windshield? It smears and streaks reducing visibility and is hard to remove when dry.
Where would you find information on acceptable limits of windshield delamination? Reference material provided by the manufacturer.
Why is it important that ice not be allowed to build up on airplane wings in flight? Ice distorts the shape of the airfoil and destroys the aerodynamic lift. The weight of the ice loads the aircraft down.
Are pneumatic deicer boots operated before ice forms or after it has formed? Pneumatic deicer boots are not operated until ice has formed over them. When the boot inflates, it breaks the ice, and the air flowing over the airfoil blows it away.
What is meant by a wet vacuum pump? An engine driven pump that uses engine oil to lubricate its steel vanes.
What is meant by a dry vacuum pump? A vacuum pump that has carbon vanes and no lubrication.
How are de ice boots cleaned? With soap and water.
How does a thermal anti icing system operate? Hot bleed air is ducted through a special chamber between a double skin in the leading edge. It operates to prevent the formation of ice.
What chemicals are used to remove frost and ice from an aircraft? Isopropyl alcohol and ethylene glycol.
How is ice prevented from forming on the windshield of modern jet transport airplanes? The windshield has a heater element embedded in it. Electric current heats the windshield and keeps ice from forming on it.
How is ice kept from forming on the pitot tube of an airplane? Pitot tubes are heated by electric current flowing through heater elements that are built into them.
How is carburetor ice prevented in the engines of the smaller aircraft? Heated air is directed into the carburetor. This heat comes from a muff around a part of the engine exhaust system.
What keeps an electrically heated windshield from overheating? Heat sensors built into the windshield control the current that is used to heat the windshield.
Created by: g153511
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