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Thread: Mid-air collision over Brasil
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Old 21st Dec 2006, 14:44
  #1053 (permalink)  
Graybeard
 
Join Date: Nov 2006
Location: SoCalif
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Reply Lights
Reply lights were eliminated in the design of Mode S, in about 1987.

Regarding the old ATCRBS transponders, the lack of a reply light is not the best in human factors to draw attention.

GB
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