Yes, I appreciate that in a multi the need for an auto is more likely to be due to a tail rotor drive/control failure*, but I'm surprised that it's possible to certify a heli with that sort of characteristic.
That sounds like I'm disbelieving - I'm not! I'm just surprised. Did someone show that the probability of needing a full autorotation was below the 1 in 10^9 threshold with an ALARP argument?
PDR
* although weren't the Sea Kings prone to transmission failures if they had an engine failure when hovering out of ground effect when doing things like mountain rescue? Something in my memory talks about it being very marginal and prone to over-torquing failures on the remaining engine, but I may have made it up