EASA AD 2026-0147: Main Rotor Drive – Main Rotor Mast – Inspection

What to do

Operators of Cabri G2 helicopters must inspect affected main gear boxes according to the specified compliance times based on helicopter group classification. Inspections must follow the instructions in the referenced service bulletins, including chemical stripping where applicable. Any discrepancies found require immediate corrective action before further flight, and modifications must be completed promptly. Results of inspections with discrepancies must be reported to Hélicoptères Guimbal within 14 days.

Summary

EASA Airworthiness Directive 2026-0147 is an airworthiness directive addressing the inspection of the main rotor drive and main rotor mast on Hélicoptères Guimbal Cabri G2 helicopters. It applies to all serial numbers of the Cabri G2 and focuses on inspecting specific main gear boxes with part numbers G21-10-000 through G21-10-003. The directive mandates inspections to detect cracks and corrosion that could compromise the main rotor mast's structural integrity.

What changed

This directive supersedes EASA AD 2026-0095R1 and introduces additional inspection requirements including chemical stripping of paint to detect hidden pitting corrosion on main rotor masts. It retains previous inspection mandates and adds new corrective actions and modification requirements to ensure the affected parts are properly inspected and modified as necessary. The directive also clarifies compliance timelines and reporting obligations.

Why it matters

This directive is critical for aviation professionals because undetected cracks or corrosion in the main rotor mast can lead to catastrophic failure and loss of helicopter control. Operators and maintenance organizations must comply with the inspection and modification requirements to maintain airworthiness and safety. Compliance ensures early detection and correction of potential structural issues, preventing accidents and ensuring regulatory adherence.