In reply to Shawn's post: here in New Zealand our CAA gathered up all of the R44 sprag (overunning) clutch problems by serial number, and on realizing that they weren't lasting long, issued an AD requiring inspection at 500 hours instead of 2200 hours. This data was presented to Robinson (about 23 occurences I think). An improved clutch is now available I believe. One has been fitted in NZ as a trial. So yes, if the data is collected and presented by the regulator, the FAA and Robinson do listen.