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Old 13th January 2010 | 16:30
  #17 (permalink)  
BOAC
Per Ardua ad Astraeus
 
Joined: Mar 2000
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From: UK
To my knowledge, there is no manufacturer who recommends takeoff with any amount of contamination on the wing upper surface.
- well, your knowledge is partly complete While Boeing do not 'recommend' it they do 'approve' it.
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