During a ground check, what is the acceptable tolerance for VOR errors?

The acceptable tolerance for VOR (VHF Omni-directional Range) errors during a ground check is +/- 4 degrees. When performing the ground check, the objective is to ensure that the VOR receiver is providing accurate directional information. The FAA standards specify that when a VOR is tested against a known reference, such as a ground-based VOR station, the maximum permissible error should not exceed 4 degrees.

This 4-degree tolerance accounts for the various factors that can influence signal reception and accuracy, including aircraft alignment with the VOR and the potential for signal distortion. Pilots and instructors need to be aware of these tolerances as they ensure safe navigation and effective communication with air traffic control.

In the context of the other choices, 2 degrees, 6 degrees, and 8 degrees do not meet the regulatory standards set forth for VOR error tolerance. Maintaining accuracy within 4 degrees is critical for pilots to ensure they are following the correct course and to prevent navigational errors during flight.