These are some of the helpful resources that as a first-time Navion buyer I used before I bought N5210K.
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Articles from AOPA Pilot Magazine
Note: AOPA membership is required to access the articles.
Navion: A Most Dignified Way to Travel: Overbuilt, Slow, But a Joy to Flyl
How To Buy Your First Airplane: An Overview of the Purchase Process
Buying In: Prepurchase Inspection: Look Before You Leap
Answers for Pilots: Do Your Homework
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From the FAA