Department of Defense (DoD) Driver/Operator Aerial Practice Exam

Instrument Flight Rules (IFR) are utilized primarily in conditions where visibility is low. This includes situations such as heavy cloud cover, fog, rain, or any circumstance that restricts a pilot's ability to see the ground or other visual references. Under IFR, pilots rely on instruments for navigation and control, which is essential when outside visual references are insufficient for safe flying.

In contrast, clear weather during daytime typically allows for Visual Flight Rules (VFR) operations, where pilots can see and avoid obstacles and other aircraft. Additionally, while IFR can be used for long-distance flights, it is not exclusively required for them as VFR may suffice in good weather. Furthermore, IFR is not necessary for all types of aerial operations, as many general aviation flights or smaller aircraft flights can operate under VFR when conditions permit. Thus, the correct application of IFR is specifically tied to low visibility scenarios.