When the FAA requires you to, following an accident. UAS does not need a required maintenance schedule. When the manufacturer does not provide a maintenance schedule.
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Continuous updraft. Frequent lightning. Roll cloud.
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Cumulus clouds with below freezing temperatures. Freezing rain. Freezing drizzle.
visible moisture. stratiform clouds. small temperature/dewpoint spread.
an increase in relative humidity. a change in temperature. an increase in cloud coverage.
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type of precipitation. wind direction. stability of the air mass.
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unstable air containing an excess of condensation nuclei. unstable, moist air. either stable or unstable air.