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Thread: What the "S" is going on at LHR?
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Old 7th December 2002 | 06:59
  #7 (permalink)  
ATCO Two
 
Joined: Jun 2001
Posts: 557
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From: Hampshire UK
Hi DB,

As far as I am aware the transponder is just left on with the mode A code selected. The mode S capability is probably transparent to the pilot. Perhaps an engineer can confirm.
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