Special Air-Report (ARS)
Special Air-Report (ARS) : Special observations made by aircraft operating on international air routes whenever (a) severe turbulence or severe icing is encountered; (b) moderate turbulence, hail or cumulonimbus clouds are encountered during transonic or supersonic flight; or (c) other meteorological conditions, for example, the other en route weather phenomena specified for SIGMET messages, are encountered that, in the opinion of the pilot-in-command, may affect the safety or markedly affect the efficiency of other aircraft operations
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