Question

If en route IFR and no applicable minimum altitude is prescribed, the minimum clearance for other than mountainous terrain should be at least __________ above the highest obstacle within a horizontal distance of 4 nautical miles from the course to be flown.

Answer 1

The minimum clearance for IFR flight over non-mountainous terrain, when no specific altitude is prescribed, is 2,000 feet above the highest obstacle within 4 Nautical Miles of the flight path.

Step-by-step explanation:

If en route IFR and no applicable minimum altitude is prescribed, the minimum clearance for other than mountainous terrain should be at least 2,000 feet above the highest obstacle within a horizontal distance of 4 nautical miles from the course to be flown. This regulation, supervised by the Federal Aviation Administration (FAA), ensures the safety of aircraft by preventing collisions with obstacles and maintaining safe separation between aircraft in flight. The rule is part of a comprehensive set of guidelines known as the Federal Aviation Regulations (FARs), which govern all aspects of aviation in the United States.