Another look at the failed C-140 wing skin
I have one more photo of the damage and thought all you amateur investigators might like to see it... shows more of the forward edge of the area in question.

I see here that not only was the piece not lapped over the leading edge all the way to the bottom, it was laid on top of the piece covering the cap in such a way that the airflow could easily "pick" at it if the tape or glue started to let go! This can't be right, although I guess if one redid the cap section so that it came back over the top and overlapped the big panel, that would be better.
I think at the moment that the bottom line here is that the gluing was just not done correctly for cold-weather ops. This plane lives in an unheated hangar, BTW.

I see here that not only was the piece not lapped over the leading edge all the way to the bottom, it was laid on top of the piece covering the cap in such a way that the airflow could easily "pick" at it if the tape or glue started to let go! This can't be right, although I guess if one redid the cap section so that it came back over the top and overlapped the big panel, that would be better.
I think at the moment that the bottom line here is that the gluing was just not done correctly for cold-weather ops. This plane lives in an unheated hangar, BTW.



[smiley=thumbsup.gif]