Benb

I would like some guidance as to where to look for corrosion on the M20C. I am especially interested in " worst case scenario" trouble spots. I want to go look at a M20C that has been sitting a while but I would like to be able to determine first if the aircraft is salvageable or just salvage. I'd especially like to see pictures or videos. I'm new to this site, it probably already has what I'm looking for but if someone could direct me it would help. Thanks

FAA Advisory circular AC 43-4A is the official word on this. https://www.faa.gov/documentLibrary/media/Advisory_Circular/AC_43-4a_.pdf To answer your seaplane question, I flew a C206 w floats. It was an older one that had been converted to a seaplane, it was placarded "salt water prohibited". Because the lap joints weren't primed prior to assembly, The factory seaplane kit had the skin primed on both sides prior to assembly, also all bulkheads, stringers, etc. I think they might do that on all new Cessna's now. If you land on salt water, you are supposed to thourougly wash the aircraft with fresh water after every flight. One C206 operator (part 135) I spoke with said that at every annual they replaced all control cables and all elevator and rudder bearings. It's not uncommon to replace skin on the aircraft operated on salt. I believe Cessna has approved the use of "Corrosion X" on most of their aircraft, including citations. I believe it to be a good product.