Service Instruction No. 1343 C

Set Screw for Propeller Governor Idler Shaft

  • Publications

Supersedes Service Instruction No. 1343B

March 10, 2016


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

At each installation of propeller governor set screw


Added “E” serial number engines; clarified instructions; added figures and torque for set screw

This Service Instruction is notification of a rework procedure to remove a spring pin part number (P/N) MS-9048-111 (if installed on affected Lycoming engine models) and install a 10-32 set screw in the propeller governor idler shaft in place of the spring pin during the next engine overhaul.

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