Rotors Flight Control — Main / Tail Servo Control Systems — Replacement
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of EC 175 B helicopters must replace affected main and tail servo control parts before their recalculated life exceeds the applicable limit or within 60 days after 19 November 2021, whichever is later. Only serviceable parts may be installed from the effective date onward. Compliance with Airbus Helicopters Alert Service Bulletin EC175-67A012 is required to perform these actions.
Summary
EASA Airworthiness Directive 2021-0240 is an airworthiness directive affecting all serial numbers of Airbus Helicopters EC 175 B helicopters. It addresses the main and tail rotor servo control systems, specifically the Main Servo Control System (P/N M673A80A1005) and Tail Servo Control System (P/N M673A80A1006). The directive mandates replacement of certain affected servo control parts to ensure continued airworthiness.
What changed
This new airworthiness directive introduces mandatory replacement requirements for affected main and tail servo control systems that have exceeded their recalculated life limits due to incorrect log card updates. It also defines serviceable parts eligibility and establishes installation restrictions for these components. The directive is based on Airbus Helicopters Alert Service Bulletin EC175-67A012.
Why it matters
This directive is critical for aviation professionals as it prevents potential failure of rotor servo control systems caused by life limit exceedance, which could lead to reduced helicopter control. Operators and maintenance organizations must ensure compliance to maintain safety and regulatory approval. Failure to comply could result in unsafe flight conditions and regulatory penalties.
More for Airbus Helicopters EC175
All 73- EASA AD 2026-0179Tail Rotor – Tail Rotor Blade – Service Life Limit Amendment / ReplacementSep 18, 2026
- EASA PAD 26-090Tail Rotor – Tail Rotor Blade – Service Life Limit Amendment / ReplacementJul 24, 2026
- EASA AD 2026-0110[Correction] Fuselage – Screws and Nuts installed on Firewalls – InspectionJun 10, 2026
- EASA AD 2026-0039Time Limits / Maintenance Checks — Airworthiness Limitations Section — AmendmentFeb 27, 2026
- EASA PAD 26-026
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