Voluntary minimum altitude.

CFR · 2024-01-01 · US · Title 10

In addition to complying with all applicable FAA prohibitions or restrictions, aircraft are requested to maintain a minimum altitude of 2,000 feet above the terrain of a designated site. Applicable FAA prohibitions or restrictions take precedence over this voluntary minimum altitude.

official document · source cfr-2024 · id 10:§ 862.6