How often must a VOR inspection be conducted under IFR?

The correct answer is that a VOR (VHF Omnidirectional Range) inspection must be conducted every 30 days for aircraft operating under IFR (Instrument Flight Rules). This requirement ensures that the navigation equipment used by pilots is functioning accurately and reliably, which is crucial for instrument approaches and maintaining safe navigation during flight.

The 30-day interval is specified in the regulations set forth by aviation authorities to mitigate the risks associated with flying in instrument conditions, where reliance on electronic navigation aids is necessary. Regular inspections contribute to overall flight safety by ensuring that the VOR systems provide correct information to pilots, allowing for precise navigation in challenging weather conditions.

Other answers suggest different intervals, but they do not comply with the specific regulations established for IFR operations regarding VOR inspections. Regular adherence to the 30-day requirement helps to maintain compliance with safety standards in aviation.