What is required for the VOR equipment to be used for IFR navigation?

The requirement that the VOR (VHF Omnidirectional Range) equipment should have been operationally checked within the past 30 days is critical for IFR (Instrument Flight Rules) navigation. This operational check ensures that the system is functioning correctly, providing accurate guidance and reliable navigational information to the pilot.

Operational checks can be performed in various methods, such as using a VOR test facility or a VOT (VOR Test Facility) signal, which help confirm the equipment's reliability and accuracy before embarking on an IFR flight. The 30-day timeframe establishes a standard that promotes safety by ensuring that the equipment is kept in appropriate working condition during its use in navigation.

The other options do not represent ICD requirements for VOR usage. For instance, while calibration and inspections are essential, they do not directly dictate operational readiness in the same rigorous manner as the 30-day operational check standard. Additionally, specific age restrictions on the equipment are not feasible as long as it has been maintained properly and passes the necessary checks.