COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES DH114 (Heron) Series Aeroplanes AD/DH114/16 Amdt 1 Engine Mounting Frames - Inspection NK Applicability: All models fitted with engine mount frames P/N 14EM-11A and 14EM-12A. Requirement: 1. Inspect the engine mounting frames for evidence of internal corrosion by visual and radiographic means. 2. The inspection shall be carried out in accordance with Hawker Siddeley TNS Heron (114) No. E3 Issue 2. Radiographs and any associated reports shall be submitted to the Secretary for examination. Compliance: At intervals not exceeding 4 years after 31 August 1970.