CD
Troll somewhere else. Ospreys are significantly safer than the tandems they replace as it only takes a single interconnect shaft drive failure to be catastrophic on tandems (like a $100 bearing). The Osprey can easily survive a similar failure or an engine failure. The secret is two rotors which are primarily driven by their own engines and linked by a backup interconnect shaft in case of a failure of an engine. The front rotor of tandems have no independent drive source so blades collide and everyone dies.
As to the main drive gearbox no vertical lift aircraft can survive an in flight main rotor transmission failure which seizes rotor drive. Some like the 92 can not even survive loss of tail rotor drive.
The Sultan