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 recognized principle in aviation safety states that even a small amount of ice or contamination on aircraft surfaces is dangerous.
• This statement is a pervasive theme in training manuals, presentations, and FAA written tests, with references dating back to 1950s regulations and 1980s FAA advisory circulars.
• The truth of this principle is extensively supported by numerous aerodynamic studies and accident investigations.

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