COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Partenavia P68 Series Aeroplanes AD/P68/29 Amdt 1 Elevator Trim Tab 1/89 Applicability: All P68 up to serial number 381 included. Requirement: Action in accordance with Partenavia SB 73 Rev 1. Note: RAI AD 88-167 refers. Compliance: Within 100 hours time in service after 20 July 1988. Background: To reduce the flexibility of stabilator tabs with seven ribs or eight ribs, modification or replacement is required. This will increase control authority. Amendment 1 calls up Rev 1 of the Requirement document which may alleviate the action required for aircraft with more than 3500 hours T.I.S.