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91.155 Basic VFR weather minimums

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FAA Regulations

Please could someone explain FAR 91.155 e). It states "For the purpose of this section, an aircraft operating at the base altitude of a Class E airspace area is considered to be within the airspace directly below that area". I'm not quite sure as to what it means and what minimums to apply.

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3 Answers



  1. Kris Kortokrax on Sep 12, 2014

    Interesting question. The only place I find a reference to the “base altitude of Class E airspace” is in FAA Order 7400.2J titled “Procedures for Handling Airspace Matters” It speaks about determining airspace to encompass procedure turns.

    When I look at my old 1981 book of regs, it is worded slightly different. It says”

    “For the purpose of this section, an aircraft operating at the base altitude of a transition area or control area is considered to be within the airspace directly below that area”

    This would seem to tie it to an instrument approach somehow. The only airspace underlying Class E in these circumstances would be Class G.

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  2. Mark Kolber on Sep 12, 2014

    It’s probably one of those things added to the reg to forestall silly questions like, “what are the VFR minimums if I am exactly at 1200 AGL where Class E starts at that altitude?”

    I think it just means that, if you are in an area where Class E starts at 700 AGL (the base altitude of the Class E airspace) you are considered to still be in Class G until you get at least an inch above 700 AGL.

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  3. psequeira on Sep 16, 2014

    Thank you Kris and Mark

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