How often are VOR checks required for IFR operations?

For IFR (Instrument Flight Rules) operations, VOR (VHF Omnidirectional Range) checks are required to ensure the accuracy of navigation equipment. The regulation mandates that a VOR must be checked and found to be within acceptable limits at least every 30 days. This requirement is part of ensuring safety and reliability in navigation, especially in IFR conditions where precision is crucial.

Frequency checks help pilots maintain confidence in their navigation systems, which is vital for adhering to air traffic control instructions and for safe flight operation in various weather conditions. By keeping VORs calibrated and regularly verified, pilots can avoid navigation errors that could result from outdated or faulty equipment. Thus, the 30-day interval is established to strike a balance between ensuring reliability while not being overly burdensome on operational schedules.