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Joined: October 17, 2010
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The other commentators are correct about the 5 by 5 part. I do believe the, 'in the pipe' part refers to being in transit to land. I heard the term originally from Pilots referring to the visualisation produced by the client end of a TLS (Transponder Landing System). The TLS largely automates that landing process.
October 17, 2010, 8:59pm
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