Transcription of SERVICE BULLETINS, INSTRUCTIONS AND LETTERS …
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SERVICE BULLETINS, INSTRUCTIONS AND LETTERS …
Lycoming SERVICE652 Oliver StreetWilliamsport, PA 17701 letter No. L197A(Supersedes SERVICE letter No. L197)January 19, 1988TO: All Owners and Operators of Textron Lycoming Piston AircraftEnginesSUBJECT: Recommendations to Avoid Valve order to minimize valve sticking problems, procedures recommended in this SERVICE letter should befollowed. Depending on the degree of intensity, sticking between the valve stem and guide can severelyrestrict the valve's opening and closing movements. A sticking valve condition is often identified by an inter-mittent hesitation, or miss, in engine sticking can be promoted by contaminants in the oil and by combustion residues. These form depositson the stem and guide that interfere with the stem's movements.
Service Letter No. L197A If the aircraft is not flown regularly, the risk of valve sticking is increased due to the build-up of moisture,
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