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3 Answers

Airport within Mode C veil, yet nobody has transponders.

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Airspace

In Colorado we have KBDU airport (Boulder, CO) which is a small airport with class G to 1200ft AGL that has alot of airplanes flying around with no electrical systems and hence no transpoders (I was one of them 15 years ago). This airport lies within the 30nm boundary of the KDEN primary class B airport and so is in the 30nm veil and should require transponder with mode C. So how do they/we get away with it? And certainly then and now, we would venture deeper into the 30nm for flight training (transponderless).

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3 Answers



  1. Aaron on Dec 30, 2013

    http://www.gpo.gov/fdsys/pkg/CFR-2013-title14-vol2/xml/CFR-2013-title14-vol2-sec91-215.xml

    91.215 (b)(3)

    Also, I fly out of KAPA, and am probably headed up to BDU to tow gliders soon. Maybe I’ll see ya up there! 😉

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  2. Aaron on Dec 30, 2013

    To clarify, because Boulder Municipal lies outside of Class A, B, and C airspace, and because presumably the aircraft were certified without an engine driven electrical system, then they are allowed to operate within the Mode C veil so long as they maintain clear of A, B, and C airspace.

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  3. Matthew Beyer on Dec 30, 2013

    duhhh. thanks. RTFM, got it 🙂 That makes sense. Thanks Aaron

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