FAA Military Competency Practice Exam

What is the minimum altitude for IFR flight over mountainous terrain?

1. 1,500 feet above the highest obstacle

2. 1,000 feet above the highest obstacle

3. 2,000 feet above the highest obstacle

4. 3,000 feet above the highest obstacle

The correct answer is: 2,000 feet above the highest obstacle

The minimum altitude for IFR (Instrument Flight Rules) flight over mountainous terrain is set at 2,000 feet above the highest obstacle within a horizontal distance of 4 nautical miles from the course to be flown. This regulation is in place to ensure that aircraft maintain safe clearance from potential hazards, such as mountains, that could pose a risk to flight safety. This altitude provides an added safety buffer given the unpredictable nature of mountain terrains, which can include rapidly changing weather conditions and uneven geography. The requirement is specifically designed to minimize the risk of controlled flight into terrain (CFIT) incidents, particularly in environments where navigation may be more challenging due to visibility and terrain features. Maintaining this altitude helps pilots ensure that they can safely navigate and react to unexpected situations while continuous adherence to IFR guidelines is crucial for operational safety.