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Blue Zipper lines on Charts

Asked by: 4292 views General Aviation

Blue Zipper lines - the floor of Class E airspace increases because since it is a controlled airspace, ATC signal weakens....

 

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2 Answers



  1. KDS on Feb 09, 2019

    Could you rephrase your question.

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  2. Mark Kolber on Feb 09, 2019

    I’m pretty sure he’s asking for the reason behind Class E “zippers” (where Class G ends and Class E begins at a specific altitude above 1200 AGL, but still lower than 14,500 msl – not too many around anymore) and speculating it’s because of weak signals in he area.

    I don’t know the answer but, given where I have seen some in the past, I suspect it’s not signal or comm availability but an effort to “even out” the Class E floor in an area of widely varying terrain.

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