COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES DH114 (Heron) Series Aeroplanes AD/DH114/38 Drag Bracing Member, Centre Section Spar Lower NK Boom - Inspection and Replacement Applicability: All models with S/Nos. prior to 14135 not incorporating modification 1102 or 1103. Document: Hawker Siddeley TNS Heron (114) No. F.18. Compliance: 1. Inspect fittings in accordance with Para. 4 of TNS Heron (114) No. F18. within 100 hours time in service after 29 June 1973 or before 1 August 1973 whichever occurs first. 2. Replace fittings in accordance with Para. 5 of TNS Heron (114) No. F.18 before 1 July 1974.