United States Department of Transportation
i
Refreshing the “1% Rule” as the Basis for an AAM Acceptable Level of Safety
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2023-09-18
[PDF-849.32 KB]
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Abstract:The purpose of the study is to determine the Acceptable Level of Safety (ALOS) for pilot incapacitation in part 121 operations when the assumptions underlying the internationally recognized “1% rule” are revised using current data. The study was begun as a response to FAA Order VS 8000.367D, AVSSMS with QMS Requirements: Oversight organizations [such as the Office of Aerospace Medicine] must determine the acceptable level of safety performance for those components of the aerospace system for which they have oversight responsibility. The 1% rule was used as a model because it was the initial framework linking aeromedical risk acceptance to airworthiness risk accepted by engineers, it has been incorporated into European Joint Aviation Authorities’ guidance, it is accepted in EASA guidelines, and has been endorsed by ICAO as threshold of choice. METHODS. A literature search produced 1% rule information that was deconstructed to give eight statements which, together, provide a logical development for the existing rule.
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