18 Aug 1981, a Huey had a separation, the blade came through the cockpit and bisected the left-seater, took off the left side fuel tanks (it was a Bravo) and then removed the tail boom. Freefall from 1500'. I had been the last person to fly this bird and survive. And no, I didn't break it - the T/R pitch change cable came off its pulley, wrapped around the driveshaft and put a ridiculous amount of pitch onto the T/R. It flapped and struck the vertical pylon, one blade came off, then the whole gearbox and remaining blade separated.
The cg change from losing 30kg from 30 feet back and the rapid yaw/roll caused the mast bump. Three fatalities.