What was found
AFT RING FRAME OF TAIL BOOM CORRODED AT 3 O CLOCK POSITION & - 45 MM'S. FOUND LARGEST PIT TO BE .18MM DEEP. AHI TO PROVIDE RDAS/8110 FOR REMOVING CORROSION, TREAT METAL, RE-APPLY PRIMER & APPLY CORROSION PREVENTATIVE. IN ADDITION TO ACCOMPLISHMENT OF SB EC135-53-026, RECOMMEND THE MANUFACTURE USE A 2 PART EPOXY PRIMER ON THE RING FRAMES TO FURTHER HELP PREVENT CORROSION. THE APPROVED REPAIR FROM AHI HAS BEEN RECEIVED AS OF 5/28/2014 & IS CURRENTLY IN WORK. THIS ACFT REMAINS OUT OF SERVICE AT THE TIME OF THIS SUBMISSION.