COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Mikoyan and Gurevich (MiG 15) Series Aeroplanes AD/MiG 15/2 Engine Lubricating Oil 10/93 DM Applicability: All Lis 2 and Lis-2SB engines fitted to SB Lim-2 (MIG 15UTI) aircraft. Requirement: Withdraw from service those engines which have been operated while using synthetic lubricating oil such as oil manufactured to MIL-L-23699. These engines may be returned to service only with the explicit and specific approval of the engine manufacturer or the Authority. Compliance: Before further flight after 14 August 1993. Background: Synthetic lubricating oil is reputed to have been used in some engines in contravention of manufacturers data.