The Standard Warning

Stop us if youve heard this before: [IMGCAP(1)] This or similar statements appear in training manuals, articles, presentations and even in the FAAs bank of written-test questions. Its said so often that the original source is obscure. I tracked an early reference back to a 1982 FAA Advisory Circular, AC 20-117, Hazards Following Ground Deicing and Ground Operations in Conditions Conducive to Icing, which references regulations established by the Civil Aeronautics Board in 1950. While I hunted…

Key Takeaways:

• A widely known aviation safety statement, frequently appearing in training and official documents, addresses hazards like those following ground deicing.
• The exact origin of this statement is obscure, but an early reference dates back to a 1982 FAA Advisory Circular that referenced 1950 Civil Aeronautics Board regulations.
• Despite its unclear original source, the validity of this safety statement is extensively supported by numerous aerodynamic studies and accident investigations.

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