COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES DH 104 (Dove) Series Aeroplanes AD/DH 104/34 Amdt 2 Applicability: All models. Centre Section Main Spar Top and Bottom Boom Joint - Inspection 9/77 Requirement: 1. Inspect the Centre Section Main Spar Top boom in accordance with Hawker Siddeley TNS CT(104) No. 237 Appendix 1, or in accordance with a technique approved by the Secretary. Technique ATG/NDI/US/1 constitutes such an approved technique. 2. Inspect the Centre Section Main Spar Bottom boom of those aircraft without Modification 779 embodied, in accordance with Hawker Siddeley TNS CT(104) No. 238 appendix 1, or in accordance with a technique approved by the Secretary. Technique ATG/NDI/US/1 constitutes such an approved technique. Note: Where crack indications are found the Airworthiness Branch, Central Office, is to be notified before further flight. Compliance: Inspect at intervals in accordance with Hawker Siddeley TNS CT(104) Nos. 237 and 238 Issue 2 as applicable.