Budapest E120 near Helsinki on Oct 15th 2021, engine failure and shut down in flight
Last Update: December 17, 2021 / 15:38:00 GMT/Zulu time
The Finnish Onnettomuustutkintakeskus (AIBF) released their final report concluding the probable causes of the serious incident were:
1. The engine power loss resulted from a P3 line failure.
Conclusion: An engine-mounted HMU establishes the minimum and maximum
limits of fuel flow to the engine as a function of P3 and the power lever position. After the loss of P3 supply, power lever movements have no effect on fuel flow to, and the power output of, an engine.
2. The pilots shut down the affected engine and completed the flight on a single engine.
Conclusion: Twin-engined passenger airplanes are certified for safe operation in the event of the failure of one engine. The performance of one engine is sufficient during all phases of the flight.
3. The CVR did not retain the pilots’ conversations during the flight because the CVR was not appropriately secured after the incident.
Conclusion: Because CVR data provides essential information for safety investigation, a CVR should be secured after an incident to prevent overwriting.
The AIBF wrote with respect to the engine failure:
An examination by a company mechanic revealed that the power loss had resulted from the failure of the P3 line in the right engine.
An HMU6 mounted on each engine establishes the minimum and maximum limits of fuel flow to the engine as a function of P37 and the power lever position. The HMU uses P3 as the primary parameter to establish fuel flow limits. Due to a P3 line failure on the incident flight, the HMU scheduled fuel flow to the right engine to the minimum, and as a result engine power decayed close to idle, but no warning indication was received in the cockpit. After the P3 line failure, movements of the right power lever had no effect on fuel flow to, and the power output of, the right engine.
The aircraft was declared airworthy after the company mechanic had rectified the fault and an engine test run was carried out.
This article is published under license from Avherald.com. © of text by Avherald.com.
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