Engine — Module 02 / Gas Generator — Service Life Calculation / Replacement
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of ARRIUS 1A and 1A1 engines must recalculate the remaining service life of affected module M02 parts within 10 flight hours or 15 days from 29 October 2019, whichever occurs first. Affected parts exceeding the recalculated limits must be replaced before the next flight or before exceeding the recalculated service life. Only serviceable affected parts may be installed on engines or helicopters from the effective date onward.
Summary
EASA Airworthiness Directive 2019-0266-E is an emergency directive addressing Safran Helicopter Engines ARRIUS 1A and 1A1 engines installed on helicopters such as the Airbus Helicopters AS355 N and AS355 NP. It mandates recalculating the service life of the gas generator module M02 due to a manufacturing non-conformity affecting high-pressure turbine blades and discs. The directive ensures continued airworthiness by requiring replacement of affected parts based on recalculated service life limits.
What changed
This new emergency airworthiness directive introduces a one-time recalculation of the remaining service life for affected high-pressure turbine blades and discs in module M02 of ARRIUS 1 engines. It requires operators to replace any affected parts that have exceeded the recalculated service life. The directive also permits installation of affected parts only if they are serviceable according to the recalculated limits.
Why it matters
The directive addresses a critical safety issue where defective turbine blades could separate in flight, potentially causing engine shutdown and helicopter control problems. For operators and maintenance organizations, compliance is essential to prevent in-flight engine failures and ensure regulatory adherence. The recalculation and replacement requirements directly impact maintenance planning and parts management.
More for Safran ARRIUS 1
All 4- EASA AD 2026-0128[Correction] Engine Fuel & Control – Hydromechanical Metering Unit – ReplacementAug 3, 2026
- EASA AD 2024-0148Time Limits / Maintenance Checks — Airworthiness Limitations Section — AmendmentJul 30, 2024
- EASA AD 2022-0005Time Limits / Maintenance Checks — Airworthiness Limitations Section — AmendmentJan 11, 2022
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