EASA AD US-2018-17-12
Engine - Full Authority Digital Engine Control - Software Upgrade Installation
Summary
The Federal Aviation Administration's Airworthiness Directive 2018-17-12 mandates an upgrade to the full authority digital engine control (FADEC) software for General Electric Company GE90-76B, GE90-77B, GE90-85B, GE90-90B, and GE90-94B turbofan engines. This directive addresses engines equipped with FADEC software version 9.3.2.4 or earlier. The upgrade aims to prevent engine damage caused by ice-crystal icing events that have led to engine stalls and shutdowns.
What Changed
This new airworthiness directive requires operators to remove the older FADEC software versions and install an updated software version that includes improved ice-crystal icing detection and mitigation features. Unlike the related GE service bulletin which recommended compliance within six months, this AD mandates compliance within 90 days of its effective date. It introduces a stricter compliance timeline to mitigate the risk during the convective weather season.
Why It Matters
This directive is critical for aviation professionals because it addresses a safety risk that could lead to high-pressure compressor failure, engine stalls, and potential loss of thrust control. Operators and maintenance teams must ensure timely software upgrades to maintain engine reliability and comply with FAA safety regulations. Failure to comply could result in increased risk of in-flight engine shutdowns and associated safety hazards.
What To Do
Operators of affected GE90 turbofan engines must upgrade the FADEC software to an approved version within 90 days of September 24, 2018. Engines with FADEC software version 9.3.2.4 or earlier must not be operated beyond this compliance deadline. Maintenance and compliance teams should coordinate with GE Aviation for the updated software and follow the prescribed installation procedures.
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