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Old Dec 29, 2019 | 6:23 pm
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navylad
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Originally Posted by TTmex
Hi.

I'm sure someone can answer. What is the higher pitched sound on the 787 just after engines reach take off power? It is almost like a high pitched whining noise and lasts until a few mins after takeoff. Not heard it on other planes.

Thanks in advance
Without hearing specifically what sound your referring I can only guess but i believe it’s a hydraulic pump that runs to facilitate the configuration changes needed. It sits just below the pax cabin I’m told.
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