Certified Flight Instructor - Flight Instructor Airplane Practice Exam

At what altitude does Class B airspace begin over a certain airport?

1. 1,500 feet MSL.

2. 2,100 feet MSL.

3. 3,000 feet MSL.

4. 4,000 feet MSL.

The correct answer is: 3,000 feet MSL.

Class B airspace is designed to protect aircraft operating in the vicinity of busy airports, and its dimensions and altitudes vary based on the specific airport and its surrounding airspace structure. Generally, Class B airspace begins at the surface and extends upward to a specified altitude, which is detailed in the aeronautical charts for specific airports. Typically, the lower limit of Class B airspace over major airports is often around 3,000 feet MSL, though it may vary from one airport to another. This altitude is established based on the airport's traffic patterns and the presence of surrounding airspace that can accommodate the operational needs of both general aviation and commercial air traffic. When considering the complexity and frequency of operations at such airports, 3,000 feet MSL is often chosen as a standard starting altitude for Class B airspace to effectively manage aircraft movements and ensure safety. It is essential for pilots to consult sectional charts or notices to airmen (NOTAMs) for specific details regarding the beginning altitude of Class B airspace for the airport in question, as this information is critical for maintaining compliance with airspace regulations and safe flight operations.