What is the lowest altitude you can fly at under IFR in non mountainous areas?

Instrument Procedures Handbook An off-route obstruction clearance altitude (OROCA) is an off-route altitude that provides obstruction clearance with a 1,000-foot buffer in non- mountainous terrain areas and a 2,000-foot buffer in designated mountainous areas within the United States.



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§ 91.177 Minimum altitudes for IFR operations. (ii) In any other case, an altitude of 1,000 feet above the highest obstacle within a horizontal distance of 4 nautical miles from the course to be flown.

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No person may operate an aircraft under IFR including over-the-top or at night under VFR at an altitude less than 1,000 feet above the highest obstacle within a horizontal distance of five miles from the center of the intended course, or, in designated mountainous areas, less than 2,000 feet above the highest obstacle ...

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If there is a group of people on the ramp watching airplanes, the FAA has considered that group to make the area “congested.” That triggers the clearance distances of 14 CFR 91.119(b).

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You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes through the checkpoint. These are limited to 3.4 ounces (100 milliliters) or less per item. This is also known as the 3-1-1 liquids rule.

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In general, you can only fly your drone in uncontrolled airspace below 400 feet above the ground ( AGL ). Commercial drone operators are required to get permission from the FAA before flying in controlled airspace.

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When the altitude of an airplane is less than 12,500 feet, there is no supplemental oxygen required for anyone in a private plane. From 12,500 feet to 14,000 feet, supplemental oxygen must be used by the required flight crew for any portion of the flight that is more than 30 minutes.

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One thing that pilots and prospective aircraft dispatchers need to understand is that there is not one universal safe altitude since some terrains or objects may be taller than others. Rather, the accepted metric is that this altitude needs to be at least 500 feet above the terrain or obstacle in question.

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