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S.I. 1221A, Dry Air Pump Drive Oil Seal Replacement. S.B. 113, Dry Sump Test Stand Installation for Lycoming Opposed Series Engines. Special Service Publication No. SSP-112-12. INDEX OF SERVICE BULLETINS, SERVICE INSTRUCTIONS AND SERVICE LETTERS. Publications 10.06.21 Special Service Publication No. SSP-112-12. INDEX OF SERVICE BULLETINS, SERVICE INSTRUCTIONS AND SERVICE LETTERS. Service Letters 10.06.21 S.I. 1221A Oil Seal, Dry Air Pump Drive, Replacement. * - Airworthiness Directives. 22. ALPHABETICAL LISTING OF TEXTRON LYCOMING. SERVICE BULLETINS, LETTERS S.I. 1221A. Dry Air Pump Drive Oil Seal Replacement. S.B. 113. Dry Sump Test Stand Installation of Lycoming Opposed Series Engines. S.L. L172B. AP. LYCOMING. SERVICE. INSTRUCTIONS. Service Instruction No. 1043A. Spark Plug Heli-Coil. Insert Replacement. W. Service Instruction No. 1221. The AD specified within Piper Aircraft Corporation Service Bulletin No. v - band couplings ; and within RIN 2120 - AA64 Lycoming Service Instruction No.Flight Standards Service Lycoming Service Instruction No. 1221A , which contains a complete reprint of Airborne Service Letter No.