Robinson R44 Raven II — Service Bulletins

This Airworthiness Bulletin (AWB 67-006 Issue 5) addresses governor control anomalies in Robinson R22 and R44 helicopters equipped with Engine Monitoring Units (EMUs). It serves as an advisory document to inform owners, operators, pilots, and maintenance personnel about potential issues with the Engine RPM Governor that could lead to engine overspeed or underspeed conditions. The bulletin emphasizes the importance of monitoring governor operation and provides recommendations for maintenance actions to ensure safe flight operations. Although the bulletin outlines concerns, it does not classify the situation as an unsafe condition warranting an Airworthiness Directive. The document aims to gather data for further investigation and potential solutions.

• This bulletin applies to Robinson R22 and R44 helicopters with EMUs installed.
• Pilots should monitor the governor operation and be prepared to take manual control if necessary.
• If a governor malfunction is suspected, land as soon as practical and have it serviced by qualified personnel.
• Report all governor control problems to CASA with detailed information.
• Follow maintenance instructions strictly to prevent contamination of connectors and wiring.