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13 Cards in this Set
- Front
- Back
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What controls the temperature in a thermal anti-icing system? |
Hot and cold air are mixed |
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What are the sources of heat for thermal anti-icing systems? |
Bleed air from the compressor section of a turbine engine, engine exhaust heat exchangers and combustion heaters |
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What prevent overheating on the leading edges of a thermal anti-ice system operated by bleed air? |
Overheat sensors signal the anti-icing valves to close and shut off the hot air |
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What happens to the hot air used by a thermal anti-ice system after it has heated the surface? |
The air is dumped overboard |
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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 the aircraft structure |
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What are the effects of arcing on an electrically heated windshield? |
Localized overheating and damage to the windshield |
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Can the operation of an electrically heated pitot to be checked with the aircraft ammeter, and if so, how? |
Yes, turn the pitot heater on and observe the deflection of the ammeter needle |
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Describe several potential problems associated with electrically heated windshields |
Arcing, delamination, scratches, and discoloration |
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Why do some pneumatic deicer boot systems have an electrically operated timer? |
To automatically cycle the boots, provide the proper rest time, and then recycle the boots |
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What are the two common methods of inflating pneumatic deicer boots? |
Bleed air from a turbine engine or the exhaust from an engine driven vacuum pump |
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What procedure is used to hold deicer boots flat with the airfoil surface during flight? |
Suction is applied to the boots |
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Why do some deicer boot systems Incorporate an oil separator? |
If a wet pump system is used, the oil must be removed before it reaches the boots because oil damages the rubber |
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What methods are used to attach a deicer boot to the leading edges of the wing and tail services? |
Adhesives, fairing strips and screws, or a combination of both |
