What is the lower boundary of Class E airspace at Tomlinson Airport?

• A. Surface
• B. 1,200 ft AGL
• C. 700 ft AGL
• D. 18,000 ft MSL

Answer: (B)

Class E begins at different heights depending on the area, and the lower boundary shown here is 1,200 feet above the ground. This means that from the surface up to 1,200 feet AGL, the airspace is Class G (uncontrolled). Above that altitude, the airspace becomes Class E and remains so until you reach the base of Class A at 18,000 feet MSL. Some airports have a Class E surface area (floor at the surface) or a 700-foot AGL floor in a designated transition area, but Tomlinson Airport is in a region where the floor of Class E is 1,200 feet AGL.