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Old 6th Jul 2014, 00:36
  #2010 (permalink)  
arismount
 
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23 KIAS

Assuming a "perfect" ASI, at 20,000 ft. PA in a standard atmosphere, 23 KIAS would equate to a TAS of about 32 Knots. That's using a rule-of-thumb to estimate; had I an E6B on hand it would no doubt yield a more accurate number.
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