EASA SIB 2017-21
WITHDRAWN - REPLACED BY EASA AD 2018-0057
Summary
EASA Safety Information Bulletin No. 2017-21 is an airworthiness communication addressing the engine and propeller control system check for L 410UVP-E20 aeroplanes with manufacturer serial numbers from 2904 and up, equipped with GE Aviation H80-200 engines and Avia Propeller AV-725 propellers. The bulletin follows a preliminary investigation of an accident involving un-commanded activation of the propeller beta mode signalization during final approach. It provides guidance based on Aircraft Industries Service Bulletin L410UVP-E/492b Revision 1 dated 4 December 2017.
What Changed
This bulletin introduces a recommendation to perform inspections of the engine and propeller control system components, including the beta switch, as a preventive measure following the accident investigation. It does not impose mandatory actions or an Airworthiness Directive but advises operators to follow the instructions in the referenced Aircraft Industries Service Bulletin Revision 1. The bulletin is informational and may lead to further regulatory action once the root cause is identified.
Why It Matters
This information is important for operators and maintenance organizations of affected L 410UVP-E20 aircraft to proactively check critical control system components to prevent potential safety issues related to un-commanded propeller beta mode activation. Early compliance with the recommended checks can enhance flight safety and reduce the risk of similar incidents. Compliance teams should monitor for any future mandatory directives stemming from this investigation.
What To Do
Operators and owners of L 410UVP-E20 aircraft with the specified engine and propeller combinations should perform the checks outlined in Aircraft Industries Service Bulletin L410UVP-E/492b Revision 1 as soon as possible. Although the bulletin does not mandate compliance, following these recommendations is advised until further investigation results are available. For technical details or copies of the service bulletin, contact Aircraft Industries or EASA Safety Information Section.