Engine — Module 03 / Stage 2 High Pressure Turbine Disc — Replacement
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators with Group 1 engines, those with affected turbine discs installed, must replace these parts within 25 flight hours from 10 July 2020, following the Safran Mandatory Service Bulletin instructions. From the effective date, no affected parts may be installed on any engine. Stakeholders should also monitor for any alternative compliance approvals from EASA if needed.
Summary
EASA Airworthiness Directive 2020-0151-E is an emergency directive addressing the replacement of Stage 2 High Pressure Turbine discs in SAFRAN Helicopter Engines ARRIEL 1B, 1C, 1C2, and 1D1 models. These engines are commonly installed on Airbus Helicopters AS 350 B series, AS 365, and SA 365 helicopters, excluding the AS 365 N3 model. The directive targets specific turbine discs with part number 0292250400 and certain serial numbers that have been identified as potentially defective.
What changed
This new regulation introduces a mandatory replacement requirement for affected Stage 2 High Pressure Turbine discs identified by specific part and serial numbers. It prohibits the installation of these affected parts on any engine from the effective date. The directive also references Safran Helicopter Engines Mandatory Service Bulletin 292 72 0860 for detailed replacement instructions.
Why it matters
This directive is critical for aviation professionals as it addresses a safety risk involving potential turbine disc failure due to material defects, which could lead to high-energy debris release and helicopter control loss. Operators and maintenance organizations must ensure compliance to maintain aircraft airworthiness and prevent in-flight failures. Compliance teams need to track affected engines and parts to avoid regulatory violations and ensure continued safe operation.
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