FAA Part 107 Drone Practice Test

What are the boundaries of Class B airspace?

1. SFC - 4,000 ft MSL

2. SFC - 10,000 ft MSL

3. 10,000 - 20,000 ft MSL

4. 5,000 - 13,000 ft MSL

The correct answer is: SFC - 10,000 ft MSL

Class B airspace is typically defined as the airspace from the surface up to 10,000 feet Mean Sea Level (MSL) surrounding the busiest airports in terms of traffic. Its primary function is to manage and protect the flight paths of large aircraft, which is particularly important in areas where commercial flights are dense. The structure of Class B airspace can vary in shape, but it generally consists of layers that resemble an upside-down wedding cake, allowing for different altitudes for aircraft operating within or around the airspace. While the other options suggest different altitudes, they do not accurately represent the standard vertical limits of Class B airspace. For instance, the surface to 4,000 feet MSL and any unspecified higher altitude limits do not align with the regulation defining Class B boundaries, which explicitly set the upper limit at 10,000 feet MSL. Hence, the specification of the Class B airspace extending from the surface to 10,000 feet MSL is essential for understanding how air traffic is organized around major airports, contributing to safe operations for both manned and unmanned aircraft.