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Old 1st Nov 2011, 04:57
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Badmachine
 
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Re: Transponder: Secondary Return "Coast" From Primary Return
What exactly is being described here and why would this occur?:

"Assigned transponder code ... changed ... the secondary radar return (transponder) indicating aircraft speed, altitude, and flight information began to coast and was no longer associated with the primary radar return.” (Page 11)

http://www.gwu.edu/~nsarchiv/NSAEBB/NSAEBB165/faa7.pdf

How do ATC secondary returns remain associated with ATC primary returns?

Thanx!
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