COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES DH114 (Heron) Series Aeroplanes AD/DH114/40 Engine Mounting Stay Struts - Inspection NK Applicability: All models incorporating modification 1125. Document: Hawker Siddeley TNS Heron (114) No. E.8. Compliance: Before 1 April 1974.