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AIRFRAME
J IRFRAME ICE AND RAIN CONTROL
| Question | Answer |
|---|---|
| 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 the compressor section of a turbine engine, engine exhaust heat exchangers and combustion heaters. |
| 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. |
| 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. |
| 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. |
| 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 pilot-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. |
| Describe several potential problems associated with electrically heated windshields. | Arcing, delamination, scratches, and discoloration. |
| 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. |
| 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 |
| 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? | If a wet pump system is used, the oil must be removed before it reaches the boots because oil damages the rubber. |
| 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. |
| 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. |
| Describe the methods commonly used to remove rain from a windshield. | Windshield wipers, a blast of air, or chemical rain repellant. |
| What power sources are used to operate windshield wipers? | Electricity or hydraulic pressure. |
| 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. |
| 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 a dry windshield? | It smears and streaks, which reduces visibility, and it is hard to remove when dry. |
| Where would you find information on the acceptable limits of windshield delamination? | In reference material provided by the manufacturer. |
Created by:
S_A_J
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