This has been needed for some time now. I personally was flying a C150 15 years ago when I broke a horizontal stabilizer spar doing a spin demonstration for a student. Was able to go to neutral Gs and get it back level and slowed down to 65 where the vibration and flapping of the stabilizer stopped at which point I flew back to the airport and landed without changing the speed.
Dis-assembly showed corrosion and an old crack about 2/3 through the spar all of which was not visible through the inspection port.
I don't know if anyone else has had this kind of experience and lived to tell about it, but it isn't a pleasant afternoon.
