As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN PERFORMING BEL HELICOPTER 100HR PERIODIC INSPECTION A CRACK WAS IDENTIFIED ON THE FORWARD SEGMENT OF THE TAIL ROTOR DRIVE SHAFT AT FLANGE. THE CRACK IS LOCATED AT THE AFT FLEX COUPLING MOUNTING FLANGE. THE CRACK TRAVELS LONGITUDINALLY ACROSS A SECURING RIVET OF FLEX COUPLING MOUNTING FLANGE AND IS 1.25" LONG. SHAFT WAS REPLACED WITH NEW.