I considered 25 meters (as per UN SOP's) but after working years with MI-8's the downwash can flatten a big man. I'm interested in procedures from the FAA etc. ...

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    $\begingroup$ I'm not sure the FAA has regulations regarding this. There is a chapter in the FAA Helicopter Flying Handbook about ground safety, but no specific distances are called out. Only that it would be difficult to develop one policy for all helicopters. $\endgroup$ – Ron Beyer May 15 '17 at 21:12
  • $\begingroup$ This question is incomplete: are you only concerned with MI-8's? If so, make sure you question says exactly that. Size matters. If you want a general rule, the question is too broad (per @RonBeyer comment) $\endgroup$ – KorvinStarmast May 16 '17 at 20:04

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