What are the chances of rotor failure? What percentage of crashes are related to a malfunction of the rotor head?

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    $\begingroup$ You are welcome to search the NTSB Accident Database for helicopter accidents with certain keywords. I'm not sure that this is answerable though as the data isn't typically compiled as percentages due to a certain component failure. I'm willing to say though that rotor head failure is insignificant given accident reports I've read. $\endgroup$ – Ron Beyer Apr 28 '16 at 17:26
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    $\begingroup$ I've only ever heard of 2, which doesn't of course mean that they are more, but I would say statistically insignificant. In my experience, the great majority of rotor failures has been the result of something else, e.g. not entering autorotation quickly enough after an engine failure; mishandlng negative G in a helicopter with a semi-rigid head etc. $\endgroup$ – Simon Apr 28 '16 at 18:54

I worked medium and heavy transport helos in the Marines, and I never heard of an incident caused by a rotor head failure. Blades, transmissions, all kinds of other things, sure, but not main rotor heads.


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