Rotors Flight Control – Ball Bearing Control System – Inspection
Superseded. Comply with 2025-0260, which replaces this document.
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected EC135 and EC635 helicopters must inspect the specified ball bearing control system parts within 50 flight hours or 3 months after 15 May 2025, whichever occurs first. Any discrepancies found must be corrected before further flight. Inspection results must be reported to Airbus Helicopters Deutschland within 15 days of inspection completion or the directive's effective date.
Summary
EASA Airworthiness Directive 2025-0108 is an interim safety directive affecting Airbus Helicopters Deutschland GmbH EC135 and EC635 helicopter models with serial numbers up to 1999. It mandates a one-time inspection of specific ball bearing control system parts, including ball pivots, yaw actuator assemblies, and control rods, to address a reported loss of tail rotor control. The directive requires reporting inspection results to Airbus Helicopters Deutschland to support ongoing investigation.
What changed
EASA Airworthiness Directive 2025-0108 introduces a new requirement for a one-time inspection of affected ball bearing control system parts on EC135 and EC635 helicopters. It also allows installation of serviceable affected parts and mandates reporting of inspection results to the manufacturer. This directive is an interim measure pending further investigation and potential future ADs.
Why it matters
This directive is critical for aviation professionals as it addresses a potential unsafe condition that could lead to loss of helicopter control. Operators and maintenance organizations must comply to ensure continued airworthiness and safety of affected helicopters. Compliance helps prevent in-flight failures and supports regulatory adherence and fleet safety monitoring.
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- EASA AD 2026-0024
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