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20 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, exhaust heat exchangers and combustion heaters |
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What prevents overheating of the leading edges of a thermal anti-ice system operated by engine 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 (exhausted) overboard |
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Why is it necessary to provide overheat protection for anti-icing systems that use turbine engine beed 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-tube be checked with the aircraft's 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 decider 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 two common methods of inflating pneumatic decider 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 decider 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 surfaces? |
Adhesives, fairing strips and screws, or a combination of both |
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What important step should be taken prior to making a cold-patch repair to a deicer boot? |
Consult the manufacturer's service manual and follow the repair instructions explicitly |
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Describe the methods commonly used to remove rain from a windshield? |
Windshield wipers, a blast of air, or chemical rain repellant |
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What power sources are used to operate windshield wipers? |
Electricity or hydraulic pressure |
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Name two problems associated with in-flight operation of aircraft windshield wipers? |
Insufficient blade pressure caused by aerodynamic forces and failure to oscillate fast enough |
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Describe the operation of a pneumatic rain removal system? |
A high velocity air blast prevents the rain from reaching the surface of the windshield |
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What are the effects of spraying rain repellant on a dry windshield? |
It smears and streaks, which reduces visibility, and it is hard to remove when dry |
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Where would you find information on the acceptable limits of windshield delamination? |
In reference material provided by the manufacturer |
