DATE: March 10, 2016 MODELS AFFECTED All Lycoming engine models. TIME OF COMPLIANCE As required. This Service Instruction contains guidelines for the use of safety cable when installing fasteners or components on Lycoming engine models.

Supersedes Service Instruction No. 1343B March 10, 2016 MODELS AFFECTED The following Wide Cylinder Flange Engines that are equipped with a front crankcase mounted propeller governor: O, IO, LIO, AIO, AEIO-320 Series O, LO, IO, LIO, AIO, AEIO, TO, TIO-360 Series O, IO, AEIO, TIO, LTIO-540 Series IO-580 Series IO-720 TIME OF COMPLIANCE At each installation of propeller governor set screw REASON FOR...

DATE: March 10, 2016 MODELS AFFECTED The following Wide Cylinder Flange Engines that are equipped with a front crankcase mounted propeller governor: O, IO, LIO, AIO, AEIO-320 Series O, LO, IO, LIO, AIO, AEIO, TO, TIO-360 Series O, IO, AEIO, TIO, LTIO-540 Series IO-580 Series IO-720 TIME OF COMPLIANCE At owner’s discretion. This Service Instruction includes inspection instructions for the propeller...

Supersedes Service Instruction No. 1059D January 27, 2016 MODELS AFFECTED All Lycoming opposed series aircraft engines TIME OF COMPLIANCE At engine assembly REASON FOR REVISION Update lubricants This Service Instruction identifies approved factory-tested lubricants for specific engine parts that must be lubricated during engine assembly. Many premature part failures have been caused by incorrect...

Supersedes Service Instruction No. 1458F and Obsoletes Service Instruction Nos. 1106D, 1311A, and 1318 November 10, 2015 MODELS AFFECTED All supported Lycoming reciprocating aircraft engines TIME OF COMPLIANCE Whenever new connecting rods and/or new connecting rod bolts are being installed REASON FOR REVISION Clarified connecting rod bolt selection and installation instructions, added new Figure 1...

Supersedes Service Instruction No. 1526F July 24, 2015 MODELS AFFECTED All Lycoming reciprocating aircraft engines TIME OF COMPLIANCE As required for replacement REASON FOR REVISION Added new piston part number This Service Instruction identifies additional new piston part numbers that superseded existing piston part numbers in the table below. All of the new pistons have been manufactured to be...

Supersedes Service Instruction No. 1129C July 23, 2015 MODELS AFFECTED All Lycoming direct drive engine models TIME OF COMPLIANCE During periodic maintenance inspection of the engine and at anytime the alternator or generator belt is installed. REASON FOR REVISION Corrected NM torque values in Table 1 If correctly installed, tensioned and checked periodically, the DC alternator or generator drive...

Supersedes Service Instruction No. 1285D and Supplement No. 1 to Service Instruction No. 1285D July 18, 2017 MODELS AFFECTED All Lycoming engines TIME OF COMPLIANCE During engine overhaul or as required REASON FOR REVISION Revised NOTICE on page 2 regarding grit blast medium This Service Instruction includes a directive advising not to use visible dye in Non-Destructive Testing (NDT) because it...

DATE: November 26, 2014 MODELS AFFECTED Lycoming engine models with AN-drive type fuel pumps. TIME OF COMPLIANCE As required. This Service Instruction includes the procedure to adjust the fuel pressure on engines that have AN-drive type fuel pumps.