SPECIAL SERVICE PUBLICATION NO. SSP-122 Rev. 1 Field Service Tool User Manual & Troubleshooting Guide DATE RELEASED: September 2023 TITLE: Field Service Tool User Manual & Troubleshooting Guide, TEO-540 Series Engine Models. Field Service Tool User Manual and Troubleshooting Guide provides information in a separate publication that will allow for easier reference by the customer and allow for more...

September 8, 2023 Service Bulletin No. 653 Hartzell Engine Tech (HET) Alert Service Bulletin (ASB) No. 098, SB653 MODELS AFFECTED Lycoming engine models using the HET part number 200F or 202F series fuel pumps with less than 100 hours time-in-service for the fuel pump. TIME OF COMPLIANCE Next maintenance event not to exceed 25 hours. This Mandatory Service Bulletin (MSB) is notification of...

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...