This is the kind of thing you don't want to find. Water got trapped between the sheet metal and spar and caused this. (This is the underside of the wing.) The factory should have put drain holes there. However, I don't think they ever expected these airplanes to be flying and working after 50 years. These spars will all have to be replaced. Straightforward, but it will take some time. A lot of the sheet metal will also get replaced. AFter all this, these wing should be good for another 50 years
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