PPRuNe Forums - View Single Post - Question about 737 NG sounds in air (flight deck)
Old 1st Jun 2007, 07:25
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vapilot2004
 
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Perhaps a ground engineer will be along shortly to enlighten.

I have always thought the noise to be engine produced and amplified by the fan case. Every series (300 and up) I have been on has this characteristic rumble.
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