What should a pilot verify before entering a holding pattern as commanded by ATC?

Before entering a holding pattern as directed by Air Traffic Control (ATC), it is essential for pilots to verify that the navigation aids are functioning correctly. This is crucial because holding patterns depend on precise navigation to ensure that the aircraft remains within designated airspace and adheres to specific track guidance.

When a pilot is directed into a holding pattern, they rely on navigational aids such as VORs, NDBs, or GPS for accurate positioning and to maintain the correct entry and holding procedures. If these aids are not working correctly, the pilot may not be able to accurately determine their position or navigate into and out of the holding pattern safely, which could lead to potential safety hazards, such as conflicting traffic or altitude deviations.

Both the arrival route and weather conditions, as well as the aircraft's weight and fuel, are important considerations for flight safety and planning, but they do not specifically address the immediate need for accurate navigation while executing a holding pattern. Thus, ensuring navigation aids are operational is the correct step for a pilot preparing to enter a holding pattern.