Rotor(s) – Main Rotor Yoke – Inspection

Published: Sep 10, 2026
Effective: Sep 24, 2026

AI-generated summary of the official EASA document. Verify against the PDF before acting.

What to do

Operators of AB412 and AB412 EP helicopters with affected main rotor yokes must perform the inspection within 100 flight hours or 90 days from 24 September 2026. If damage is found, the affected yoke must be replaced before the next flight. From the effective date, no affected yokes may be installed on any helicopter.

Summary

EASA Airworthiness Directive 2026-0175 is an airworthiness directive addressing the inspection of main rotor yokes on Leonardo S.p.A. AB412 and AB412 EP helicopters. It specifically targets main rotor yokes with part number 412-010-101-all that bear the Bell Helicopter Textron trademark or CAGE code 97499. The directive mandates a one-time inspection to detect mechanical damage that could lead to structural failure.

What changed

This new directive introduces a mandatory inspection requirement for affected main rotor yokes on AB412 and AB412 EP helicopters. It requires operators to inspect the yokes within 100 flight hours or 90 days and to replace any damaged parts before further flight. Additionally, it prohibits installation of affected parts from the effective date onward.

Why it matters

This directive is critical for aviation professionals because undetected manufacturing defects in the affected yokes can cause fatigue cracks and potential failure of the flexure arm, risking helicopter control loss. Compliance ensures continued airworthiness and safety of the affected helicopter fleet. Maintenance and compliance teams must prioritize inspections and part replacements to avoid unsafe conditions.

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