Robinson R44 — Service Bulletins

This service bulletin provides essential inspection instructions for the RSA-10AD1 fuel injection servos installed on Robinson R44 II helicopters. It addresses issues related to idle valve thrust washer wear, particularly due to organic fuel contamination, which has been observed in some servos. The bulletin outlines compliance requirements, inspection procedures, and reassembly instructions to ensure the safe operation of the affected helicopters. It also includes information on terminating actions to eliminate the need for ongoing inspections by installing a specific idle and mixture valve kit.

• Inspect idle lever assembly thrust washer every 500 hours.
• Check for stiffness in throttle control; inspect idle lever if stiffness is present.
• Torque screws during reassembly to 15-20 lbs/in.
• Nominal setting for idle mixture link is 2.84 inches center to center.
• Installing kit P/N 2576659 terminates the need for ongoing inspections.