What is the maximum bearing error allowed for an operational VOR equipment check using an FAA-approved ground test signal?

The maximum bearing error allowed for an operational VOR (VHF Omni-directional Range) equipment check using an FAA-approved ground test signal is indeed 4 degrees. This standard is established to ensure that the VOR system remains accurate and reliable for navigation. The 4-degree margin is set by the FAA to maintain a high level of precision in navigation, which is critical for safety and efficiency in flight operations.

Any greater bearing error could lead to navigational discrepancies, potentially resulting in pilots being unable to accurately determine their position or follow their intended flight trajectory. Regular checks and adherence to this tolerance ensure that any discrepancies in the VOR equipment are identified and corrected promptly, ensuring safe operations.