Engine Fuel & Control – Electronic Engine Control Unit – Software Update; Engine Fuel & Control – Preference Injector – Non-extinguishing Test / Replacement
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must perform non-extinguishing tests within specified flight hour intervals and replace preference injectors before they exceed 500 flight hours since new or repair. Software upgrades to the EECU must be completed within 14 to 24 months depending on engine group. Installation of non-compliant EECUs is prohibited from specified dates, and compliance with these actions is mandatory by 20 July 2026.
Summary
EASA Airworthiness Directive 2026-0131 addresses safety concerns for SAFRAN Helicopter Engines ARRIUS 2B2 engines, commonly installed on Airbus Helicopters Deutschland EC135 and EC635 models. The directive mandates software updates to the Electronic Engine Control Unit and introduces non-extinguishing tests and replacement requirements for the preference injector component. These measures aim to prevent engine flameouts caused by fuel coking and injector clogging.
What changed
This directive supersedes EASA AD 2024-0195R1 and introduces additional requirements including a new software upgrade (mod TU 172) for Group 3 engines and revised non-extinguishing test intervals. It also mandates replacement intervals for preference injectors and prohibits installation of pre-modification EECUs after specified dates. The AD partially retains previous requirements while expanding compliance to additional engine groups.
Why it matters
The directive is critical for operators and maintenance organizations to prevent uncommanded engine shutdowns due to clogged preference injectors, which can compromise helicopter control. Compliance ensures continued airworthiness and operational safety of affected ARRIUS 2B2 engines. It also impacts maintenance scheduling and parts management by enforcing stricter inspection and replacement intervals.
More for Safran ARRIUS 2
All 18- EASA AD 2026-0027Time Limits / Maintenance Checks — Airworthiness Limitations Section — AmendmentFeb 11, 2026
- EASA AD 2024-0202R1Engine Fuel & Control — Fuel Control Unit — ReplacementSep 8, 2025
- EASA PAD 25-138WITHDRAWN - EXPLANATORY STATEMENT ATTACHEDSep 5, 2025
- EASA AD 2024-0218R1-CNCANCELLED: Engine — Gas Generator High-Pressure Turbine Blades — ReplacementMar 17, 2025
- EASA AD 2024-0195R1Engine Fuel & Control — Electronic Engine Control Unit — Software Update; Preference Injector — Non-extinguishing Test / Replacement
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New ADs and bulletins for Safran ARRIUS 2, Airbus Helicopters EC135 and Airbus Helicopters EC635, summarized like this page, every Monday.