What is the acceptable airborne check tolerance for VOR errors?

The acceptable airborne check tolerance for VOR errors is +/- 4º when evaluating the performance of VOR navigational instruments. This standard ensures that the instrument can provide reliable navigation information necessary for maintaining course accuracy.

When checking a VOR in flight, it is critical to remain within this angular tolerance to ensure accurate tracking of the intended flight path. If a VOR indication deviates beyond this range, it could lead to navigational errors, potentially affecting the safety and efficiency of flight operations.

While the other choices present different tolerances, they do not align with the standards established by aviation authorities. This emphasizes the importance of adhering to specific tolerances for successful instrument navigation and flight safety, thus reinforcing the need for pilots and instructors to be aware of and comply with the established guidelines for VOR accuracy in flight operations.