PPRuNe Forums - View Single Post - Why mode A when squawking 7700?
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Old 23rd Mar 2007, 17:31
  #11 (permalink)  
norilsk
 
Join Date: Nov 2006
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But if you have a very old transponder like mine it has only mode A & B and mode b has been obsolete for years. Yes 7700, 7600 7500 still produce the required effect!
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