COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Grob G115 Series Aeroplanes AD/GROB 115/7 Amdt 2 Cancellation of the Reduction of the Never Exceed Speed 4/98 Applicability: Models G115C, G115C2, G115D, G115D2, all serial numbers. Requirement: Action in accordance with Grob Service Bulletin 1078-69. Note: LBA AD 96-270/3 refers. Compliance: Unless already accomplished, before the next flight after 26 March 1998 . This amendment becomes effective on 26 March 1998. Background: The investigation of an incident of buffeting when an aircraft approached the never exceed speed, identified a vibration in the aircraft structure that had originated at the engine shock mounts as the cause. Amendment 1 required certain inspections to clear aircraft for aerobatic manoeuvres while maintaining the airspeed limitation of the previous issue of this Directive. Amendment 2 is issued in response to a revision of the related LBA AD which cancels the previously required airspeed limitation following successful completion of the buffeting investigation. Amendment 1 of this airworthiness directive became effective on 9 October 1997. The original issue of this airworthiness directive became effective on 14 February 1996.