You have to SERIOUSLY g load a Mooney to break the spar. This is going way back in my brain from when I used to work for their support network, so the story may not be right. A J model Mooney flew through a thunderstorm in East Texas in the late 90s or early aughts, with predictable results. When they found the wreck, both wings and the H stab were attached but the wing spar was broken. I hope I'm remembering this right, I want to say that they determined the airplane had been subject to 9g positive and -2 or -3 before it finally gave up. Those planes are seriously overbuilt, and are incredibly sturdy.