What was found
(CAN) DURING MAINTENANCE VISIT, EDDY CURRENT INSPECTION AT STA 9900 TAILBOOM FITTINGS OF EASA REGISTERED ACFT, IT WAS DISCOVERED THAT CRACKS PROPOGATED FROM 3 OF THE 4 FITTINGS ON THE TAILBOOM. UPPER RT AND LT TAILBOOM ATTACH FITTINGS AND RT LOWER ATTACH FITTING. LOWER LT ATTACH FITTING HAD NO CRACKS. ON AIRFRAME TAILBOOM ATTACH POINT IT WAS NOTED THE RT UPPER FITTING HAD A CRACK PROPOGATING. THE RT AND LT LOWER AIRFRAME ATTACH POINT FITTINGS HAD HOLE ELONGATION. THE NR 1 TAILROTOR DRIVESHAFT SUPPORT WAS ALSO FOUND TO HAVE A CRACK THROUGH EDDY CURRENT INSPECTION. THE NR 2 TAILROTOR DRIVESHAFT SUPPORT WAS FOUND DISBONDED FROM THE UPPER DECK. ACFT HAD VIBRATION NOTED ON THE HUMS SYSTEM. ACFT IS L2 MODEL NOT L1 BUT SELECTION IS NOT AVAILABLE.