You are right in that it did?'t fly for several years, I don?t know how much harm that could have done to the airframe (apparently it was stored inside a hangar), however, the engine was remanufactured just three years ago.
From what I've gathered from the posts, it sat for 6 years before 1993, but has been annualed and flown every year since. That 6 year period 12 years ago shouldn't be an issue, now. Any major problems would already have been repaired, hopefully. Factory Remanufactured engine only 3 years old? Good, but that's no guarantee!
How far away should an airplane be from the ocean so that salt water corrosion is no longer an issue anymore? if it has been aprox. 10 to 20 miles away from the shore and stored inside a hangar do you think it would be possible for it to have no corrosion at all as the seller afirms?
Arizona!
There, or Antartica, is about the only place that an airplane can sit inside or outside and not develop some kind of corrosion. If aggressively watched for, treated, and kept in check, usually all you get is some minor "frost" (minor surface corrosion) inside the skins where you can't reach, but even this can go bad fast in isolated areas, such as in the fuel tank area Charles mentioned, or the wing "carry through" spars above the headliner. You will see this frost inside the wings, fuselage, and tail during annuals, when all the access panels are removed. Aircraft with bare metal skins inside, that have sat outside through repeated spring thaws, develop this frost faster inside the upper surfaces, where water condenses under the snow and ice chilled aluminum.
I've lived near the Florida coasts for over 20 years (Tampa bay area, then Jacksonville) and have seen and heard of very little corrosion I can attribute specifically to "salt air". I worked at the Jacksonville Naval Aviation Depot until my recent retirement, and although Naval aircraft are well treated against corrosion, I saw very little exposed metal that had problems from carrier operations at sea. It's not really exposure to salt air, or even salt water, that allows corrosion to form ... it's the neglect or incomplete washing afterwards! I
have seen airplanes at coastal airports (St.Augustine comes to mind) turned into junk by being allowed to sit for a few weeks after a salt water wash from a hurricane. Even these airplanes could have been saved by an immediate disassembly and thorough fresh water wash! Even if an older aircraft has sat inside a hangar
all it's life, it can and probably will still develop some surface corrosion or worse, unless the hangar happens to have environmental controls (unlikely).
Some well maintained older aircraft are almost corrosion free, but, in my opinion, all airplanes have corrosion somewhere! Some are just worse (sometimes much worse) than others. It's locating the corrosion, determining if it can be economically repaired before it does real damage, and how much it affects structural integrity, that are some of the real questions.
Sorry! I tend to ramble!