NEW TURBOCHARGER MOUNTING HARDWARE DATE March 21, 2019 MODELS AFFECTED TO-360-C and -F series engines TIME OF COMPLIANCE At owner’s discretion or when part replacement is necessary. REASON FOR REVISION Revision A is being released to update the P/N of the strut assembly and various hardware P/N’s along with reformatting of the service instruction.

Oil Sump Baffle Replacement Supersedes Service Instruction No. 1279C May 15, 2019 MODELS AFFECTED: IO-540-AA1A5, -AA1B5, -AE1A5, -E1A5, -E1B5, -K1A5, -K1B5, -K1D5, -K1E5, -K1F5, -K1G5, -K1H5, -K1J5, -K1K5, -K1A5D, -K1G5D, -K1J5D, -L1C5, -M1A5, -M1C5, -M1B5D, -S1A5 TIO-540-A2B, -A2C, -AE2A, -AH1A, -F2BD, -J2B, -J2BD, -S1AD, -U2A LTIO-540-F2BD, -J2B, -J2BD, -U2A IO-580-B1A TIME OF COMPLIANCE...

SUBJECT: LYCOMING ENGINES' PRODUCT SUPPORT HOURS DATE RELEASED: JULY 12, 2019 TO: Owners and Operators of Lycoming Aircraft Engines

SUBJECT: LYCOMING MODEL DESIGNATION FOR FUEL INJECTORS DATE: October 10, 2019 TO: All Owners and Operators of Lycoming Piston Aircraft Engines Lycoming Engines’ naming convention for fuel injector model designations is identified in the table of Service Letter Number 279. The naming convention is intended to describe the general feature set specification of the fuel injector and does not...

SERVICE LETTER NO. 277 HARTZELL ENGINE TECHNOLOGIES AND LYCOMING ENGINES ALTERNATOR DISTRIBUTION AGREEMENT DATE RELEASED: December 17, 2019 TO: Owners and Operators of Lycoming Aircraft Engines

Service Bulletin No. 639 Inspection of Rocker Arm, Part Number LW-15014 January 17, 2020 MODELS AFFECTED O-320-H2AD, O, LO, TO, LTO-360-E1A6D new, rebuilt, or overhauled engines shipped from Lycoming since June 2017 with less than 500 hours of operation or engines with less than 500 hours of operation since rocker arm replacement. TIME OF COMPLIANCE At next scheduled oil change, then every 50...

NEW CONNECTING ROD BUSHING DATE: March 12, 2020 SUBJECT: New Connecting Rod Bushing MODELS AFFECTED: All Lycoming Engine Models TIME OF COMPLIANCE: As Required

SPECIFIED FUELS FOR SPARK-IGNITED GASOLINE AIRCRAFT ENGINE MODELS DATE: April 8, 2020 SUBJECT: Specified Fuels for Spark-Ignited Gasoline Aircraft Engine Models MODELS AFFECTED: Lycoming engine models as detailed in Table 3 TIME OF COMPLIANCE: When refueling aircraft REASON FOR REVISION: Added listings for IO-390-D to Table 3

ENGINE INSPECTION AFTER OVERSPEED DATE: April 9, 2020 SUBJECT: Engine Inspection after Overspeed MODELS AFFECTED: All Lycoming piston engines. TIME OF COMPLIANCE: As required by the subject bulletin. REASON FOR REVISION: Added new engine model IO-390-D to Table 1. Added new steps in Table 4 to include EIS Overspeed. Added a new NOTICE before the Magneto Overspeed Inspection section. Added a new...