Robinson R22 — Maintenance Manual

This document is an Airworthiness Directive (AD) for the Robinson R22 series helicopters, specifically addressing the inspection of upper steel tube frames (P/N A020-2) installed on all model R22 helicopters with serial numbers 0400 and higher. It outlines the requirements for visual inspections of the frame for cracks or corrosion, particularly in areas that have been identified as critical. The directive emphasizes the importance of these inspections due to reports of fatigue cracks and failures in flight, especially for aircraft used in aerial work. Compliance timelines for inspections are specified based on the type of operations the aircraft is engaged in, ensuring safety and airworthiness of the R22 helicopters.

• Inspect A020-2 frames for cracks or corrosion as per the directive.
• Initial inspections for aerial work must occur before 25 hours of service; for other operations, before 100 hours.
• Use a torch and mirror for inspections of the upper steel tube frame.
• Report any unusual vibrations during flight immediately for further inspection.
• Strengthening modifications to frames must be approved by CASA and the manufacturer.