Service Instruction No. 1577A INTAKE VALVE IN-SERVICE DATA DATE: JANUARY 25, 2023 SUBJECT: Intake Valve In-Service Data MODELS AFFECTED: O-540-F1B5 engines with serial number ending with “-40E” installed in Robinson R44 Raven I and R44 Cadet helicopters TIME OF COMPLIANCE: During the next scheduled 50-hour inspection for engines with less than 500 hours since new, rebuild, overhaul, or cylinder...

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Service Instruction No. 1472 August 12, 1994 MODELS AFFECTED All Lycoming reciprocating engines. TIME OF COMPLIANCE Prior to installation of engine in the aircraft Prior to shipment from Lycoming, an engine undergoes a preservation treatment. In order to protect the cylinders and related parts preservative oil is sprayed into each cylinder. If an intake valve is open, it is possible for oil to get...