At what altitude is a pilot required to check the VOR sensitivity if necessary?

A pilot is required to check the VOR (VHF Omni-directional Radio Range) sensitivity above 10,000 feet primarily due to the increased coverage and reliability of the VOR signals at higher altitudes. When flying above this altitude, the VOR signal is less likely to be affected by terrain or obstacles, which can interfere with reception.

This requirement ensures that the pilot maintains accurate navigation during flight, especially when operating in airspace where navigation precision is critical for safety. Monitoring the VOR sensitivity is an essential part of pre-flight checks and ensures the reliability of navigation systems, particularly in IFR (Instrument Flight Rules) operations where pilots depend heavily on navigational aids.

The requirement to check VOR sensitivity at this altitude takes into account the operational characteristics of VOR systems and the higher likelihood of signals being received more clearly and accurately.