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Thread: Boeing 757 flap screeching sound (?)
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Old 29th May 2006 | 18:39
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boeing_dude
 
Joined: Apr 2006
Posts: 3
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From: Finland
You can hear this noice on ground as well as in flight, whenever the flaps are in motion. Isn't the Power Transfer Unit (PTU) for backup only and not operating in normal conditions? Would anyone know about the electric pumps - are they loud?
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