COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Volkswagen Derivative Piston Engines AD/VW/3 Rear Bearing 8/88 Applicability: Revmaster R2100 series engines. Requirement: Modify the No 1 main bearing (rear) by providing a locating dowel for both bearing halves. Compliance: Unless already accomplished, at next disassembly of the crankcase assembly. Background: This Directive has been issued to reflect the requirements of cancelled Airworthiness Directive ANO 106 AD/REV/3.