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SUBJ: Awareness of NTSB Performance Study and Addendum

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This Special Airworthiness Information Bulletin (SAIB) is sent to advise manufacturers of
airplanes certified under parts 23 and 25 of the Federal Aviation Regulations (14 CFR parts 23
and 25) to consider the possibility that the airplane’s maximum lift coefficient in ground effect may
be lower than its maximum lift coefficient in free air.

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