Back to the cause. IF it was T/R driveshaft failure - and just that - anyone know, as SASless asked, whether you can maintain (lowish) altitude in a 350 given a failure when cruising at say 110kts plus? From distant recollection, the emergency procedure presumes one CAN land immediately, so should. Guess it's pretty hard to really simulate..... I suppose at a certain T/R pitch the effect on weather-cocking will be the equivalent of no spinning tail rotor, but it's surely an imprecise science. Any offers?