madrock/FH100 Pilot,
The term 'extremely remote' is assigned a numerical value in FAR 29 - i.e. 1:10,000,000 to 1:1,000,000,000.
Those who are interested in the discussion in this thread might wish to glance through the regulations; in particular a search for 'extremely remote' (in context) in AC 29-2C will provide a great deal of illumination.
Whilst I have the platform, I would like to comment on HC's assertion that pilots are not involved in the provision of the Certification Codes. In my experience, the FAA Rotorcraft Directorate at Forth Worth always has several practicing pilots (and recently one was the Head). The CAA also had a number of pilots in the Flight Department working on the provision of the Certification Codes - fewer now because of EASA.
I also witnessed the failure of a planetary gear in the S61 at my base in the North Sea; it was landing at the time.
Jim