US FAA yesterday issued a Notice of Proposed Rulemaking significantly expanding its icing certification standards for transport category aircraft. The NPRM "includes a new requirement that manufacturers show airplanes can operate safely in freezing drizzle or freezing rain, conditions that constitute an icing environment known as 'supercooled large drops.'" It is intended to respond to the previously little understood icing phenomenon that led to the loss of an American ...

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