EASA SIB 2013-23
WITHDRAWN - REPLACED BY EASA AD 2021-0195
Summary
EASA Safety Information Bulletin 2013-23 is an informational document addressing uncommanded engine power loss, rotor speed fluctuations, or in-flight shutdown caused by Electronic Engine Control Unit (EECU) failure in Turboméca ARRRIEL 2D engines. These engines are installed on helicopters such as the Eurocopter AS 350 B3 and EC 130 T2. The bulletin describes the failure mode involving a tantalum capacitor short-circuit leading to fuel flow regulation loss and provides safety information for operators.
What Changed
EASA Safety Information Bulletin 2013-23 reports on an identified failure mode of the EECU in Turboméca ARRRIEL 2D engines and the resulting risks. It introduces a temporary Rotorcraft Flight Manual procedure to help pilots identify and respond to this failure. Additionally, Turboméca developed a modification to the EECU to prevent the failure progression and mitigate associated risks.
Why It Matters
This information is critical for aviation professionals as it highlights a potential safety risk that may not be indicated by standard warnings, affecting engine performance and flight safety. Operators and maintenance teams need to be aware of the failure mode to ensure appropriate pilot procedures and consider the recommended EECU modification to reduce the risk of in-flight engine issues.
What To Do
Affected operators are recommended to incorporate the Turboméca EECU modification following the instructions in Turboméca Service Bulletin 292 73 2852. They should also implement the temporary Rotorcraft Flight Manual emergency procedure as required by EASA AD 2013-0287. No mandatory compliance deadline is specified, but timely action is advised to enhance safety.