Engine — Stage 3 Turbine Wheels — Inspection
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of ASTAZOU XIV B and XIV H engines must inspect the rear face of affected stage 3 turbine wheels within 50 engine cycles after 27 April 2018 or before exceeding 400 engine cycles since the last overhaul, whichever is later, and repeat inspections every 400 engine cycles. If any defects are found, the engine must be removed from service and repaired according to Safran Helicopter Engines Mandatory Service Bulletin 283 72 0813. Installation of affected parts is permitted only if inspections are performed as required.
Summary
EASA Airworthiness Directive 2018-0085 is an airworthiness directive addressing Safran Helicopter Engines ASTAZOU XIV B and XIV H engines installed on helicopters such as the Airbus Helicopters SA 319 B (Alouette III) and SA 342 J (Gazelle). It mandates inspections of certain stage 3 turbine wheels due to potential vibration issues that could lead to turbine blade cracks and possible engine failure. The directive provides instructions for repetitive inspections and corrective actions to ensure continued airworthiness.
What changed
This new airworthiness directive introduces mandatory repetitive inspections of affected stage 3 turbine wheels on ASTAZOU XIV engines to detect cracks caused by non-compliant turbine blade natural frequencies. It requires removal and repair of any turbine wheels found with discrepancies and allows installation of affected parts only if inspections are performed as specified.
Why it matters
This directive is critical for aviation professionals because it addresses a safety risk that could lead to uncommanded engine shutdowns or release of high-energy debris, potentially compromising helicopter control. Operators and maintenance organizations must comply to prevent in-flight engine failures and ensure regulatory compliance, thereby maintaining aircraft safety and operational reliability.
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