(John Galban) wrote
In the case of the T-34, I think the spar AD was warranted. They
were actually snapping in aerobatic flight.

The first spar AD may have been warranted - or not. The only planes
that ever snapped a wing in flight were being used by those 'fighter
pilot for a day' operations. No privately owned T-34 ever had a
problem. There is every reason to believe that the planes that lost
wings were being operated well outside the design envelope - rolling
gee has been implicated in every one of the failures.

Also, the second AD is clearly bull****. No T-34 that had the first
AD done has ever had a problem, even in the weekend warrior
operations. The T-34 that crashed in Houston and precipitated the
imposition of the second AD didn't have the first AD done.

Michael