COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Hiller UH-12 Series Helicopters AD/HILLER 12/27 Amdt 2 Outer Gimbal Forward Attach Fitting - Inspection 12/84 TX Applicability: All models UH-12D and UH-12E series which have been converted to turbine power by STC SH177WE or SH 178WE. Requirement: 1. Remove the paint from the outer gimbal forward attach fitting of the Hiller Engine Mount P/No. 63181-5. 2. Using a dye penetrant or a magnetic particle inspection technique, inspect the gusset weld beads for cracks on both the front and rear sides of the gusset. Note: FAA AD B4-19-08 refers. Compliance: 1. Within 20 hours' time in service after 06 November 1984 and thereafter at intervals not exceeding 600 hours' time in service. 2. Upon installation or reinstallation of engine mount assy P/N 63181-5. Background: A recent overseas accident resulted from fatigue failure of the outer gimbal forward attach fitting. This directive has been amended to include repetitive inspections of the attach fitting.