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Old 21st June 2011 | 11:23
  #7 (permalink)  
BOAC
Per Ardua ad Astraeus
 
Joined: Mar 2000
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From: UK
Flap altitude limitation is normally due to local airflow becoming supersonic.
- Hmm. I think you'd be pushed to get a shockwave at 210kts at 20,000ft!
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