COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Partenavia P68 Series Aeroplanes AD/P68/34 Engine Mount 5/91 DM Applicability: All P68C-TC up to serial number XXX-46TC. All P68 OBS-TC up to serial number XXX-030 BTC. Requirement: Action in accordance with the Technical Requirements of R.A.I. AD 91-83. Note: Partenavia SB 82 refers. Compliance: Within 25 hours time in service after 27 March 1991 or prior to 30 April 1991; whichever occurs first. Background: Reports of cracks in the engine mount structure have been received. This Directive requires a detail inspection in the area of the lower attachment.