Airspace & ChartsQuestion 44 of 100
Near a busy airport a sectional chart shows a solid magenta circle marking the outer shelf of Class C airspace, with a small boxed notation reading 45 above a line and 12 below it. How should a remote pilot interpret those two numbers?
a.The ceiling is 4,500 ft AGL and the floor is 1,200 ft AGL above the reporting point
b.The ceiling is 4,500 ft MSL and the floor of that airspace segment is 1,200 ft MSL
c.The ceiling is 45,000 ft MSL and the floor of that airspace segment is 12,000 ft MSL
d.The ceiling is 4,500 ft MSL and the airspace segment extends down to the surface
Explanation
Numbers in an airspace box on a sectional are expressed in hundreds of feet MSL, so 45 over 12 means a ceiling of 4,500 ft MSL over a floor of 1,200 ft MSL for that outer shelf. The values are MSL, not AGL, so a pilot must add field or terrain elevation reasoning when comparing them to altitude above the ground. A floor reaching the ground would be printed as SFC rather than a number, and 45,000 ft would appear as 450.
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