NTSB -- NTSB Safety Recommendations A-12-24 and -25

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NTSB SAFETY RECOMMENDATION

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National Transportation Safety Board

Washington, DC 20594

June 26, 2012

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NTSB Safety Recommendations A-12-24 and -25

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The National Transportation Safety Board makes the following

recommendations to the Federal Aviation Administration:

Require that Avions de Transport Régional (ATR)42-series

airplanes operating in the United States incorporate a

revised stickpusher activation angle of attack(AOA), such

that the stick pusher activates before the stall AOA in the

presence of airframe ice accretions. (A-12-24)

Evaluate all U.S.-certificated transport-category airplanes

equipped with stick pushers to ensure that the stick pusher

activates at an angle of attack that will provide adequate

stall protection in the presence of airframe ice

accretions.(A-12-25)

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http://www.ntsb.gov/doclib/recletters/2012/A-12-024-025.pdf

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The complete recommendation letter is available on the Web

at the URL indicated above.

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An archive of recommendation letters is available at

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Electronic versions of letters may or may not include

enclosures; however, related publications, accident

briefs, and aviation accident synopses may be found

on the NTSB website.

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