What should be done during a VOR check if the error exceeds the tolerance?

When conducting a VOR check, if the error exceeds the allowable tolerance, the proper course of action is to use a backup navigation method. This ensures that the pilot continues to operate safely and effectively. The VOR system may not provide reliable navigation information if it is malfunctioning or inaccurately calibrated, which can compromise flight safety. By utilizing an alternative navigation method, such as GPS or other ground-based navigational aids, the pilot can navigate accurately while addressing the issue with the VOR system.

The other options are less suitable in this situation. Performing a recalibration of the VOR system is not a practical immediate response since recalibrating would typically require maintenance and is not something that can be done in-flight. Ensuring that the pilot rechecks the VOR settings is a good practice, but if the error exceeds tolerance, merely verifying settings does not resolve the fundamental issue of potential malfunction. Signing the log is an administrative task that does not address the critical need for reliable navigation in flight. Therefore, using a backup method ensures safety while allowing for proper procedures to be followed later.