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Form ACA-337 - approved data ?

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cashflyer

cashflyer

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Is it correct that a 337 form dated prior to ~ 1956 is considered "approved data" ?
I keep hearing that bandied about but have not located either a regulation or an FAA policy that states such.

And if it IS such a magical vellum, has anyone attempted to gather scans that could be included in an indexed online library?
 
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