Service Bulletin No. 651 Inspection for Rotator Caps on Intake Valves September 29, 2022 MODELS AFFECTED O-540-F1B5 and O-360-J2A engines with serial number identified in Table 1 TIME OF COMPLIANCE Engines with less than 300 hours, inspect at next scheduled maintenance event not to exceed 50 hours of operation. Engines with 300 hours or more must be inspected within next 10 hours of operation.

REPRINT OF HARTZELL ENGINE TECHNOLOGIES’ (HET) ALERT SERVICE BULLETIN (ASB) 076 DATE: December 8, 2022 MODELS AFFECTED: Lycoming engine models using the HET model 200F, 201F or 202F series fuel pump. TIME OF COMPLIANCE: Next maintenance event not to exceed 25 hours. REASON FOR REVISION: Update to the new ASB 076 which obsoletes ASB 069.

SERVICE BULLETIN NO. 649 DATE: December 8, 2022 MODELS AFFECTED: IO-540-AB1A5 TIME OF COMPLIANCE: Before next flight

Service Instruction No. 1324 D January 25, 2023 Supersedes Service Instruction No. 1324 C MODELS AFFECTED All direct drive series engines. TIME OF COMPLIANCE Any time the front crankshaft oil seal is replaced Clarified cleaning for the crankcase bore, added Permatex® Optimum Max Flex Black (P/N 27037) as recommended sealant, with Pliobond® #20, Pliobond® #25 or Dow Corning® 737 Neutral Cure...

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...