How can you locate airborne or ground VOR test sites?

The correct method for locating airborne or ground VOR test sites is through the Airport/Facility Directory (AFD). The AFD is a comprehensive resource that provides detailed information on airports, heliports, navigational aids, and various other facilities and services available to pilots. It includes specific information about VOR test facilities, including their location, operational hours, and frequency, making it a reliable tool for flight planning and navigation.

While sectional charts can provide a visual representation of navigational aids, they may not offer the detailed location data specific to VOR test sites. GPS systems can indicate the general location of VORs, but they do not specifically identify test sites. Consulting ATC can provide additional assistance, but it is not the primary method for finding this information. Therefore, the most effective and reliable way to locate VOR test sites is through the AFD.