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.

Supersedes Service Instruction No. 1406D September 9, 2014 MODELS AFFECTED O-320-H2AD, -H3AD; O/LO/TO/LTO-360-E1A6D TIME OF COMPLIANCE At owner’s discretion (during hydraulic lifter replacement) This Service Instruction identifies part numbers for crankcases with large-diameter hydraulic lifters.

DATE: June 5, 2014 MODELS AFFECTED Lycoming Engines’ turbocharged engine models. TIME OF COMPLIANCE During turbocharger exhaust system replacement. This Service Instruction contains basic guidelines to disassemble, assemble, and install a typical exhaust system on a Lycoming Engines’ turbocharged engine model. These instructions apply only to turbocharged exhaust systems supplied by Lycoming...

Supersedes Service Instruction No. 1141 May 9, 2014 MODELS AFFECTED All Lycoming direct drive engines TIME OF COMPLIANCE Whenever starter ring gear replacement is necessary This Service Instruction is a field procedure to replace worn or damaged starter ring gears.

DATE: May 7, 2014 MODELS AFFECTED TIO-540-J2B, -J2BD; LTIO-540-J2B, -J2BD. TIME OF COMPLIANCE Next oil change or engine inspection, whichever occurs first, no later than August 31, 2014. Evidence in the field has shown instances of chafing (Figure 1) on the turbocharger support rod (of affected Lycoming engine models). Figure 2 shows the proximity of the identification tag on an oil hose to one of...

DATE: March 21, 2014 MODELS AFFECTED Lycoming engine models in Table 1. TIME OF COMPLIANCE As required for replacement. This Service Instruction identifies new piston ring part numbers that are alternates to the existing piston ring part numbers. All of the alternate piston rings have been manufactured to be equivalent to the existing piston ring part numbers shown in Table 1. Each new piston ring...

March 19, 2013 This supplement corrects the Part Number in the following NOTE of Service Instruction No. 1454A dated February 25, 2011.