COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES DH114 (Heron) Series Aeroplanes AD/DH114/35 Amdt 2 Aircraft Life Extension NK Applicability: All models incorporating life extension by wing modification or replacement. Document: For Series 1B aeroplanes: British Aerospace TNS Heron (114) No. M.11, Issue 2. For Series 2 aeroplanes: British Aerospace TNS Heron (114) No. M.9, Issue 4. Compliance: As detailed in the requirement documents. Note: The safe lives referred to in para. 1.1 of each requirement document are superseded by those promulgated in the current issue of AD/DH114/13. The manufacturer has advised that the aircraft life cannot be extended beyond two wing spar boom lifetimes.