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This is the place where the majority of the warbird (aircraft that have survived military service) discussions will take place. Specialized forums may be added in the new future
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1820 UPN

Thu Feb 17, 2005 11:44 pm

Here is somthing for you 1820 operators to look into.
UPN (Unapproved Parts Notification) for Wright 1820's
http://www.faasafety.gov/SPANS/notices/ ... -00210.doc
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