What is the VOR aerodrome check point requirement in degrees?

The VOR aerodrome check point requirement is essential for ensuring the reliability and accuracy of navigation using Very High Frequency (VHF) Omnidirectional Range (VOR) systems. The correct requirement is to ensure that the VOR indication is no more than 4 degrees off when the aircraft is within 0.5 nautical miles (NM) of the VOR.

This specific standard is set to ensure that pilots can rely on their navigation systems when approaching or departing from an airport. A tolerance of 4 degrees allows for minor discrepancies in the VOR signal while still ensuring safe and precise navigation during critical phases of flight. The closer proximity of 0.5 NM to the VOR station amplifies the need for accuracy because any navigational errors can significantly impact the aircraft's final approach or departure trajectory.

Ensuring that the VOR is accurate to this specification is a critical aspect of maintaining safe operational procedures in aviation, particularly in the busy environments around aerodromes.