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Old 08-10-2019, 11:21 AM   #11
Dbahnson
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Bob may be correct about the 1920s. I've looked through the list of Type Certificates and could not find ATC 87 listed, but there are very few two digit Type Certificates, as most are three digits. So my guess is that this one was approved early on in the type certification process, although I don't know when that was instituted for propellers.
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