Textron Aviation SEB-79-10 Oil Pressure Switch Relocation
Airplane Serial numbers that follow that have a Lycoming IO-360-L2A engine.
172R - 17280001 thru 17281622
172S - 172S00001 thru 172S12620
This service bulletin provides parts and instructions to move switch downstream to reduce cyclic loading forces on the Hobbs Oil Pressure Switch.
NOTE: Any switch that has operated in the right crankcase location must be replaced at 1,000 hours and must not be moved to the new location on the accessory housing.
NOTE: Any switch that will be installed in the accessory housing location by this service bulletin must be a new zero time-in-service switch and must never have been operated in the right crankcase location.
For additional information refer to Model 172R/172S Maintenance Manual, ICA Supplement NO:
See SEB here: Link
See ICA Supplement here: Link
For More Information: