Certified Flight Instructor - Flight Instructor Airplane Practice Exam

At what altitude does the controlled airspace begin at the Corpus Christi VORTAC?

1. The surface

2. 700 feet AGL

3. 1,200 feet MSL

4. 2,500 feet MSL

The correct answer is: 700 feet AGL

Controlled airspace is defined by specific altitudes, and understanding these boundaries is essential for pilots operating in or near them. At the Corpus Christi VORTAC, controlled airspace begins at 700 feet above ground level (AGL). This means that flights operating below this altitude are not subject to the rules and regulations governing controlled airspace, while operations at or above this altitude must adhere to the requirements placed on pilots, including communication with air traffic control. This altitude is significant because it indicates the transition from uncontrolled airspace to controlled airspace. Generally, controlled airspace starts at either the surface, 700 feet AGL, or 1,200 feet MSL, depending on the airspace classification and geographic characteristics. In this specific case, the choice of 700 feet AGL accurately reflects the point at which the controlled airspace is established, ensuring that pilots are clear on the vertical limits that define their operating environment.