Hoy/Yoder/Van Slyke area (Denver Class B shelf, NE) · Denver Sectional, 3 Sep 2026 – 29 Oct 2026 · Denver.pdf (FAA current sectional, not redistributed), p. 1 · Not for navigation
Refer to the current Denver sectional excerpt. Near Hoy Airstrip, a Class B shelf is charted as "120" over "70." What is the floor of the Denver Class B airspace at that point?
Why: Sectional charts print a Class B (or C) shelf as a fraction: the top number is the ceiling and the bottom number is the floor, both in hundreds of feet MSL — confirmed by this same chart's own "Examples of Class B Altitudes" legend. "120" over "70" means a ceiling of 12,000 feet MSL and a floor of 7,000 feet MSL at that location.
Swaps the two numbers — 12,000 feet MSL is this shelf's ceiling (the top number, "120"), not its floor.
Both Class B shelf numbers are in feet MSL, not AGL — the chart's own altitude-legend box labels both the ceiling and floor rows "MSL," never AGL.
UA.II.A.K1 · Source: Denver.pdf, current edition sectional chart excerpt (gitignored full-resolution source; not redistributed — see sources/README.md) · Reviewed 2026-10-22