COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES DH114 (Heron) Series Aeroplanes AD/DH114/22 Wing Strap For Engine Mounting NK Pick-Up - Inspection Applicability: All models. Document: Hawker Siddeley TNS Heron (114) No. W.15. Compliance: Within 300 hours time in service after 20 February 1970 and thereafter in accordance with the requirement document.