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Old Jan 4, 2008 | 3:48 am
  #13  
FlyinHawaiian
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Originally Posted by Peacock
What is that annoyingly loud hum that is heard on Channel 9 on 767s (when Channel 9 is tuned to ATC). Is it 400Hz pickup? Why is it so much more pronounced on 767s than other aircraft? Thanks in advance.
http://flyertalk.com/forum/showthread.php?t=725901
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