COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piaggio P166 Series Aeroplanes AD/P166/29 Flap Hinge Attachment At Rib No. 13 5/64 Applicability: All models prior to S/No. 410. Requirement: 1. Inspect the flap hinge attachment at rib number 13 for cracking at the following components: The attaching plate of the hinge bracket, the web of the dummy spar, the flanges of the joint plate and the dummy spar post. Piaggio SL 166-9 refers. If cracking is found modify in accordance with para. 2 before further flight. 2. Modify in accordance with Piaggio SB No. P166.38. 3. RAI AD 64-26, P166-23, Rev. 1 also refers. Compliance: Para. 1 - Within the next 100 hours time in service and thereafter at intervals not exceeding 100 hours time in service until modified. Para. 2 - For aircraft that have exceeded 2,000 hours time in service - by 1 November 1964; For aircraft not exceeding 2,000 hours time in service - at the first routine inspection following the aircraft reaching 2,500 hours time in service.