COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bell Helicopter Textron 47 (All Variants) Series Helicopters AD/BELL 47/58 Amdt 1 Drag Brace Clevis 11/67 Applicability: All model 47 series with wooden main rotor blades. Requirement: 1. Remove drag brace clevises P/N 47-110-235-1 and inspect for cracking in the root of the first six threads from the fork end of the clevis before re-installation. The inspection is to be performed using a fluorescent magnetic particle technique such as Magnaglow or equivalent with residual longitudinal magnetisation. 2. Alternatively, replace existing clevises with - (a) new parts, (b) serviceable used parts that have either not been involved with main rotor damage or, if so, have been inspected in accordance with para. 1 above. Compliance: 1. Before further flight following damage to the main rotor blades sustained through contact with foreign objects whilst rotating. 2. For parts inspected in accordance with paragraph 1 above, repeat the inspection at between 40 and 50 hours time in service following re-installation.