Dear Madam/Sir,
Please find attached hereto an EASA Safety Information Bulletin (SIB) which has already been posted on our web site and can be viewed at
https://ad.easa.europa.eu/ad/2017-21 .
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EASA SIB No.: 2017-21
Safety Information Bulletin
Airworthiness
SIB No.: 2017-21
Issued: 15 December 2017
Subject: Check of the Engine and Propeller Control System
Ref. Publications:
Aircraft Industries a.s. (AI) Service Bulletin (SB) L410UVP-E/492b Revision 1 dated 04 December
2017.
Applicability:
L 410UVP-E20 aeroplanes, manufacturer serial numbers from 2904 and up, if equipped with GE
Aviation H80-200 engine and Avia Propeller AV-725 propeller.
Description:
Preliminary investigation of an accident on 15 November 2017 with an L 410 aeroplane near
Khabarovsk, Russia, identified an un-commanded activation of the beta mode signalization of a
propeller during the final approach. For the time being, as a preliminary preventive measure, AI
issued Revision 1 of SB L410UVP-E/492b, providing instructions to check the components of
engine and propeller control system, including the beta switch.
At this time, the safety concern described in this SIB is not considered to be an unsafe condition
that would warrant Airworthiness Directive (AD) action under Regulation (EU) 748/2012,
Part 21.A.3B.
As soon as the investigation identifies the root cause and/or contributing factors of the accident,
EASA may take further action.
Recommendation(s):
EASA recommends owners and operators to accomplish the actions as specified in Revision 1 of AI
SB L410UVP-E/492b.
Contact(s):
For further information contact the EASA Safety Information Section, Certification Directorate.
E-mail:
[email protected].
For a copy of the referenced SB, or further information regarding the technical content of this SIB,
please contact Aircraft Industries a.s. via e-mail:
[email protected].
This is information only. Recommendations are not mandatory.
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