What does IFR stand for in aviation?

Prepare for the ASTB Aviation/Nautical Information Test with comprehensive study materials. Boost your knowledge with flashcards and multiple-choice questions, complete with hints and explanations. Ensure your success on exam day!

The term IFR stands for Instrument Flight Rules in aviation. This refers to the regulations under which a pilot operates an aircraft in weather conditions generally below visual flight rules (VFR). These rules govern the procedure for flying in poor visibility and require pilots to rely on their instruments for navigation and control of the aircraft rather than visual references outside the cockpit.

IFR is crucial for safe operations in various weather conditions, allowing flight operations to continue in situations where visibility is limited due to factors such as fog, rain, or low cloud cover. By following IFR, pilots are able to maintain a safe margin of separation from other aircraft and obstacles, ensuring operational safety in controlled airspace.

The other options do not accurately represent the established terminology in aviation. For example, "Internal flight regulation" and "Intermittent flight response" do not have any recognized relevance in aviation terminology. Similarly, "Instrument frequency range" may pertain to aspects of communication or navigation equipment but does not define the concept of IFR in the context of flight rules.

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