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91.215 2)a)

Asked by: 1589 views ,
General Aviation

Mode C is required at and above 10,000 feet MSL over the 48 contiguous states or the District of Columbia, excluding that airspace below 2,500 feet AGL .  So here's my dilemma- I don't understand the 2,500 AGL part. Are they trying to say that we don't require Mode C below 2,500AGL?

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2 Answers



  1. James c on Apr 12, 2014

    Say you wanted to take off from KLXV, at almost 10,000 MSL, you could depart there and not need a transponder until 12,500 MSL. 2500AGL above 10,000 MSL, basically it’s for high alt places like Colorado,

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  2. psequeira on Apr 14, 2014

    Thanks a ton James!

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