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18.1- De-icing issue/event - An event involving the procedures for ice removal from the surface of an aircraft
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18.2- Ice accumulation - An event involving ice accumulation on the surface of an aircraft
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18.3- Turbulence - An event involving a disruption in the aircraft's normal flight by external air flow changes, could be caused by dynamic atmospheric pressures, jet streams, mountain waves, cold/warm fronts, thunderstorms or other aircraft
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18.4- Hail - An event involving a disruption in the aircraft's normal flight by hail formation
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18.5- Lightning strike - An event involving a disruption in an aircraft's normal flight by an external lightning strike to the aircraft surface
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18.6- Volcanic ash - An event involving a disruption in an aircraft's normal flight by external volcanic ash formation
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18.7- Windshear/microburst encounter/warnings - An event involving a disruption of an aircraft's normal flight by a rapid change in wind direction or velocity
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18.8- Thunderstorm - An event involving a disruption of an aircraft's normal flight due to thunderstorms or need for crew to navigate around a thunderstorm
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18.9- Visibility restrictions/Fog/Haze - An event involving a disruption of an aircraft's normal flight due to fog, haze or other visibility restrictions
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