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Oct 15, 2019, 10:17 PM
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Super silly ways to break 400' "legally"


We all know about the E3/E4 loophole, where there's no limit and no permission required in class E extensions. But there's a few others too.

1) The Cliff, Variant 1. Find yourself an over-300' hill with a straight drop or overhang in a place with a 700' class E. (or a much higher hill in a place with a 1200' class E). Fly to 400' above the hill, then move _laterally_ into the class E.

2) The Cliff, Variant 2. Same trick, but this time start from the bottom. Fly up, over the hill, then up further and cross into the class E.

3) LAANC hill. You still need a hill, but not a cliff. Find a hill near the edge of class B/C/D. Get authorization to fly to 400'. Enter class E laterally from the class B/C/D.

4) The Tower. If Red Bull could do it, why not us. Build a large platform up into the Class E, and take off from there. Building 700' tall structures is expensive, but probably cheaper than Congressmen.

5) The Platform. Find a hill laterally near class E. Build a cantilever platform off it, into the class E, and take off from there. Cheaper than #4, but more geographically restricted.
Last edited by nybbler; Oct 15, 2019 at 10:25 PM. Reason: Thought of #5
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Oct 16, 2019, 05:51 AM
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Your post calls out 400 feet. The correct term is 400 feet AGL (above ground level). What does that do to all the calculations?
Oct 16, 2019, 06:01 AM
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Originally Posted by Ray93J
Your post calls out 400 feet. The correct term is 400 feet AGL (above ground level). What does that do to all the calculations?
That's what he's talking about. AGL is the height above whatever terrain is directly below the aircraft.


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