Tail Rotor Drive — Tail Rotor Drive Fan Wheel and Second Stage Impeller — Inspection / Replacement / Re-identification
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must inspect affected tail rotor drive fan wheels and second stage impellers within 165 flight hours or 6 months from 17 July 2024, whichever occurs first. If inconsistencies are found, replace the affected parts before the next flight. If markings are consistent, re-identify the parts before their next removal or during the next scheduled maintenance. Do not install any affected parts on helicopters after the effective date.
Summary
EASA Airworthiness Directive 2024-0127 is an airworthiness directive applicable to Airbus Helicopters AS 355 E, F, F1, F2, and N models. It addresses the inspection, replacement, and re-identification of tail rotor drive fan wheels and second stage impellers with specific part numbers due to incorrect identification during production. The directive aims to ensure continued airworthiness and prevent potential loss of helicopter control.
What changed
This new airworthiness directive introduces a one-time inspection requirement for affected tail rotor drive fan wheels and second stage impellers. Depending on inspection results, parts must be replaced or re-identified to correct production misidentification. It also prohibits installation of affected parts from the effective date onward.
Why it matters
This directive is critical for aviation professionals because incorrect part identification can lead to undetected fatigue failure, risking helicopter safety and control. Operators and maintenance organizations must ensure compliance to maintain traceability and airworthiness of critical tail rotor components. Non-compliance could result in unsafe flight conditions and regulatory violations.
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