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STD-1223

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NIPPLE-.375 FLARED TUBE
Revision
-B
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Service Instruction No. 1481 C

Supersedes Service Instruction No. 1481B November 24, 2025 MODELS AFFECTED All Lycoming reciprocating aircraft engines shipped from the Lycoming Engines factory after effective date of this Service Instruction. TIME OF COMPLIANCE Not applicable. REASON FOR REVISION Revised the entire service instruction.
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Service Instruction No. 1368 A

Supersedes Service Instruction No. 1368 November 24, 2025 MODELS AFFECTED All O-320-H2AD 76 series engines. TIME OF COMPLIANCE Whenever oil leakage occurs at the tachometer adapter seal. REASON FOR REVISION Split Step 1 into 2 steps. Added new Figure 1 to identify part numbers.
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Service Letter No. L299

Service Letter No. L299 DATE: January 5, 2026 TO: Owners and Operators of Lycoming IO-390-C3B6 Engine Models Installed on Cirrus Aircraft
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Jim Wright

Jim Wright is the senior vice president of Lycoming Engines, the only U.S.-owned and operated aviation piston engine manufacturer. In this role, Wright is responsible for the strategic direction of Lycoming Engines, inclusive of its aviation product portfolio development, experimental and certified designs, its manufacturing core competencies, and customer services. He also serves as a member of...
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Service Letter No. L 114 BL

SERVICE LETTER NO. 114 BL RECIPROCATING ENGINE AND ACCESSORY MAINTENANCE PUBLICATIONS DATE: January 15, 2026 TO: Owners and Operators of Lycoming Aircraft Engines REASON FOR REVISION: Updated contact information and references for Veryon (formerly ATP) and TBX (formerly Tdata). Updated revision levels for TEO-540-C1A in Table 1. Updated parts catalog numbers for several engine models. Updated the...
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TEO-540-C1A Engine Maintenance Manual Rev 5

DOCUMENT PART NO. MM-TEO-540-C1A DATE RELEASED: January 2026 TITLE: TEO-540-C1A Maintenance Manual Rev 5 DOCUMENT PART NUMBER: MM-TEO-540-C1A Rev 5 Click Here To Download Publication