COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Rotax Piston Engines AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section. AD/ROTAX/9 Propeller Gearbox Inspection 8/2000 Applicability: All Rotax 912A engines S/N 4,410.330 through 4,410.366 inclusive, 912F engines S/N 4,412.781 through 4,412.791 inclusive, 914F engines S/N 4,420.128 through 4,420.156 inclusive and gearboxes supplied as replacement parts S/N 15081, 15139, 15341, 15559, 15560, 15561 or 15562. Note 1: The stated engines and gearboxes are only affected if the dog hub, overload clutch or gearbox, for affected engines, have never been replaced. Requirement: Inspect and if necessary, replace the gearbox, in accordance with Rotax Service Bulletin SB-912-027 Revision 1 or SB-914-010, Revision 1, as applicable, both dated February 2000. Note 2: Austro Control (Austria) AD No 101 refers. Compliance: Unless previously accomplished, within 30 hours time in service or prior to 30 November 2000, whichever comes first. This Airworthiness Directive becomes effective on 10 August 2000. Background: The manufacturer has advised that a combination of 7 degrees tapered dog hub and 30 degrees backlash dog gears may have been combined in the gearbox of affected engines or replacement gearboxes. Eugene Paul Holzapfel Delegate of the Civil Aviation Safety Authority 27 June 2000 The above AD is notified in the Commonwealth of Australia Gazette on 12 July 2000.