SERVICE LETTER NO. L293 Air Temperature Sensor P/N 60C28409 DATE POSTED: November 9, 2023 TO: All Owners and Operators of Lycoming TEO-540-C1A REASON FOR PUBLICATION: This Service Letter announces the availability of an enhanced Air Temperature Sensor to be used when replacement of existing sensor is required.

SERVICE INSTRUCTION NO. 1585A DATE: December 1, 2023 SUBJECT: Oil Cooler Bypass Valve Assembly Replacement REASON FOR REVISION: Revised the first paragraph and replacement instructions based on the option to use either Oil Cooler Bypass Valve Assembly P/N 53E29909 or Oil Cooler Bypass Valve Assembly P/N 53E22144 MODELS AFFECTED: Lycoming TEO-540-C1A TIME OF COMPLIANCE: At owner’s discretion

SERVICE INSTRUCTION NO. 1589 DATE: December 1, 2023 SUBJECT: Exhaust Bypass Valve Assembly Replacement MODELS AFFECTED: Lycoming TEO-540-C1A TIME OF COMPLIANCE: At replacement or upon observation of manifold pressure oscillations.

Service Instruction No. 1532 N APPROVED FUEL INJECTORS, FUEL MANIFOLD ASSEMBLIES, AND FUEL NOZZLE ASSEMBLIES FOR LYCOMING ENGINES DATE: December 13, 2023 SUBJECT: Approved Fuel Injectors, Fuel Manifold Assemblies, and Fuel Nozzle Assemblies for Lycoming Engines MODELS AFFECTED: Engine models in Tables 1, 2, and 3 TIME OF COMPLIANCE: As required for replacement REASON FOR REVISION: Added part...

SERVICE LETTER NO. 114 BK RECIPROCATING ENGINE AND ACCESSORY MAINTENANCE PUBLICATIONS DATE: December 14, 2023 TO: Owners and Operators of Lycoming Aircraft Engines REASON FOR REVISION: Updated the revision dates for engine model TEO-540-C1A in Table 1. Updated the parts catalog listing for the YO-233-B2A in Table 2. Updated revision level for SSP-112 in Table 3. Added SSP-122 to Table 3. Removed...

TO: All Owners and Operators of Lycoming Piston Aircraft Engines REASON FOR PUBLICATION: Revised prefixes, letter codes, and descriptions

SPECIAL SERVICE PUBLICATION NO. SSP-112-14 INDEX OF SERVICE BULLETINS, LETTERS, AND INSTRUCTIONS DATE RELEASED: December 2023 TITLE: INDEX - SERVICE BULLETINS, LETTERS, AND INSTRUCTIONS DOCUMENT PART NUMBER: SSP-112-14

HARTZELL ENGINE TECH (HET) SERVICE BULLETIN (SB) No. 203 DATE: January 4, 2024 MODELS AFFECTED: Turbochargers manufactured, rebuilt or overhauled by HET and HET turbocharger Overhaul Kits shipped between 10/31/2022 and 5/17/2023 with less than 50 hours time in-service for the turbocharger. TIME OF COMPLIANCE: If applicable, immediately perform a one-time inspection of the affected turbocharger.

INTAKE PIPE AND FLANGE INSPECTION DATE: January 4, 2024 MODELS AFFECTED: IO-360-A, -C, -D, -M, -N, -P Series; TO, TIO-360-C16D; -C1A6D; HIO-360-A, -C, -E, -F Series; LIO-360-C, -M Series; AEIO-360-A Series IO, HIO, AEIO-390-A Series IO-540-A, -E, -G, -K, -L, -M, -S, -AA, -AC, -AE, -AG Series; TEO-540-A, -C Series; TIO-540-A, -F, -J, -R, -U, -S Series; TIO-540-AE2A, -AH1A, -AJ1A; AEIO-540-L Series...