What does the term "IFR" mean?

The term "IFR" stands for "Instrument Flight Rules." This refers to a set of regulations under which a pilot operates an aircraft in weather conditions generally worse than visual flight rules. Under IFR, pilots rely on instruments for navigation and control of the aircraft, rather than visual references. This does not only involve flying in reduced visibility but also follows specific procedures for communication and navigation, ensuring safe and orderly flow of air traffic within controlled airspace.

IFR is crucial for flying in adverse weather conditions, as it dictates how pilots must navigate and communicate with air traffic control. Understanding IFR is essential for pilots and air traffic controllers to maintain safety and efficiency in the airspace system, particularly during poor visibility situations.

The other choices do not accurately represent the meaning of IFR; they either describe different technological aspects of aviation or misconstrue the intended operating parameters for instrument-based navigation and flight.