Which checks must be accomplished before flying an aircraft under IFR?

The correct answer highlights the specific requirements for aircraft instruments and systems checks prior to flying under Instrument Flight Rules (IFR). Under these regulations, a VOR (VHF Omni-directional Range) check must be conducted within the previous 30 days to ensure the accuracy and reliability of the navigation system. This is a crucial safety measure for IFR operations, as pilots rely on VOR for navigation in low visibility conditions.

Additionally, the altimeter system check is required to be completed within the past 24 calendar months. This check ensures that the altimeter’s accuracy is maintained, which is essential for altitude reporting and safe operation in various airspace forms, particularly where altitude separation is critical.

Understanding these requirements is vital for both maintaining the safety of the flight and complying with regulatory standards. Checking instruments like the VOR and altimeter systems is not only a regulatory measure but also a fundamental aspect of ensuring flight safety under IFR conditions.