COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES DH114 (Heron) Series Aeroplanes AD/DH114/12 Amdt 1 Aileron Lever Part No. 14 WA. 199 - Inspection NK and Modification Applicability: All models not incorporating Mod. No. 662. Document: Hawker Siddeley TNS Heron (114) No. W.3, Issue 3. Compliance: Inspect at intervals not exceeding 50 hours time in service until modified. Modify before 1 June 1970.