A2C wrote:
He's wrong.
.
Really?
A couple months ago we took apart what looked like a perfectly good center section for a T-6....at least structurally. We chemically stripped it and cleaned it. After inspection we determined that that it looked pretty good and set about to replace the extrusions we normally replace. We checked the spar caps and found them to be good. A couple weeks later or soda blast guy was at the shop and since there were a couple areas we still hadn't gotten the paint off, we had him clean it. When he did the spar cap, it started to come apart one specific area. Intergranular corrosion just below the surface.
Fortunately, we have an approval to replace the extrusions with new material. A week later we were back up and running again.
Guess what? We learned another process to add to our projects. This is something that would have never been found in a visual inspection and never would have been found if we hadn't taken the center section a part.
I can tell you story after story like this. There is no rhyme or reason to where we find the corrosion whether on a flying airplane or one that has been sitting around.
How about the one where the cast blocks that hold the fuselage to the center section spar were corroding on the mating surface where you would never see them until you drilled them off? Found that on the airplane that I had been flying for five or six years. Once you see something like that, you will definitely have a different opinion of what the airplane can or can't handle.
I don't post any of this because I am trying to scare people or muster up business. I have got more business than I know what to do with for the forseable future for the size of the staff I want to have.
If anyone wants to have a true intelligent dialogue about what we are finding in these airplanes I would be glad to have it. This guy obviously doesn't want to.