COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Volkswagen Derivative Piston Engines AD/VW/2 Cast Crankshafts 8/88 Applicability: Revmaster R2100D engines fitted with ductile steel crankshafts. Requirement: Replace cast crankshafts fitted to applicable engines with the equivalent forged crankshaft. Compliance: Before installation in an aircraft. Background: This Directive has been issued to reflect, in part, the requirements of cancelled Airworthiness Directive ANO 106 AD/REV/1A. The inspection requirements of AD/REV/1A are n ow contained in Airworthiness Directive ANO 106 AD/VW/1.