What was found
FOLLOWING A WRONG REPAIR PROCESS OF THE FREEWHEEL SHAFT, IT HAS BEEN OBSERVED A CASEHARDENING THICKNESS MEASURED AT 0.7 MM INSTEAD OF A VALUE REQUIRED BETWEEN 1.2 MM AND 1.4MM. THIS NON-CONFORMITY CAN REDUCE THE FATIGUE STRENGTH IN THOSE SECTIONS AND A CRACK BELLOW THE HARDENED LAYER COULD SPREAD. THE IMPACTED PARTS ARE : ITEM N° 0292907670 SN 1442B FITTED ON ARRIEL 1 ENGINE SN 19384, ITEM N°0292907740 SN 5480 FITTED ON ARRIEL 1 ENGINE SN 19402, BOTH FOR COUNTY OF LA SHERIFF. ITEM N°0292900020 SN 1789B FITTED ON ARRIEL 2B ENGINE SN 22092 FOR MOUNTAIN AIR HELICOPTERS INC. ITEM N°0292900030 SN 456/RA FITTED ON ARRIEL 2B1 ENGINE SN 51159 FOR SUNDANCE HELICOPTERS INC. ITEM N°0292900030 SN 1532 FITTED ON ARRIEL 2B ENGINE SN 22197 FOR US CUSTOM AND BORDER PROTECTION.