Recommends Use Of Loctite On Idler Gear Set Screw The FAA has issued a Special Airworthiness Information Bulletin (SAIB) concerning Lycoming Engines (Lycoming) 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; and IO-720 series, wide cylinder flange engines, equipped with a front crankcase-mounted propeller governor.
Source: aero newsFAA SAIB Focuses On Lycoming Engine Prop Governors