Which inspections are required under IFR?

The required inspections under IFR (Instrument Flight Rules) include a VOR (VHF Omnidirectional Range) check and a pitot-static system inspection. The VOR must be tested and documented for accuracy every 30 days when the aircraft is operated under IFR conditions, as these systems play a critical role in navigation. The pitot-static system is essential for the operation of instruments such as the airspeed indicator, altimeter, and vertical speed indicator, which are vital during instrument flight.

The other options, while they may involve important components of the aircraft, do not specifically align with the regulatory requirements for IFR operations. For instance, engine and airframe inspections are generally part of regular maintenance schedules but are not unique to IFR requirements. Similarly, inspections of fuel and electrical systems, and cabin instruments, while necessary for overall flight safety, do not have specified intervals that are mandated under IFR regulations.