COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES DHC-2 (Beaver) Series Aeroplanes AD/DHC-2/15 Amdt 1 Applicability: All models. Main Undercarriage Lower Forward Bolt Attachment - Inspection 8/84 Requirement: Inspect the main undercarriage lower forward attachment bolts for cracking as follows: 1. P/N C2U-487ND (part of bolt assembly No. C2U-185A) : magnetic particle inspect in accordance with ANO 108.8 or fluorescent penetrant inspect in accordance with ANO 108.10. 2. P/N 02-B-16 (hard chrome plated bolts): fluorescent penetrant inspect in accordance with ANO 108.10. Compliance: At intervals not exceeding 100 hours time in service for aircraft engaged in agricultural operations, and 500 hours time in service for other aircraft.