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Travel Guide
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Fehlbedienung durch Piloten?
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crew contribution
By moses on Friday, Aug 14th 2026 13:42Z
The Engine High Vibration NNC instructs the crew to: Retard (the throttle) to maintain vibration levels below 4 units or until the thrust lever is closed. It does not allow the crew to increase thrust again. In this case the vibrations were 4.3 units, the crew reduced thrust and the vibrations reduced to 1.2. when the crew increased thrust and resumed climb, the vibrations reached 5 units, the engine fan blade separated. When you have high engine vibrations and need to reduce thrust to maintain vibrations below 4 units, you had better understand that you can't continue the flight as planned. Don't try, as the price can be high. Maybe the fan blade would have separated anyway, but the fact is it happened after increasing thrust and not before.
Quelle: