Duncan Mac, as usual BBC not very specific. It was a Parachute jumping trip which went wrong from what I can deduce. Man jumps, carried back to tail of aircraft fouls tailfin and control surfaces and probably affects the balance. Plane goes out of control and remaining skydivers and crew use their chutes and jump to safety. Man tangled up with tail "buys the farm".
Sorry I cannot be more precise but that is as much as Ceefax gave. Perhaps someone from Downunda can supply more detail.