In certain mountainous areas, that 2000-foot minimum may be reduced. Fast moving winds forced over mountainous terrain can cause large variations in the pressure gradient at given true altitudes, resulting in large altimeter errors. The extra clearance over mountains is because of the Bernoulli effect as air flows over the mountains. The required obstacle clearance is 1000 feet in non-mountainous terrain and 2000 feet in designated mountainous areas. The amount of required obstacle clearance (ROC) depends upon where your site is located (see FAR Part 91.177). If your proposed structure is within the limits of the airway an analysis of the MOCA requirements and ROC determines the maximum allowed height at a specific latitude/longitude location. This is done for all low altitude airways. Our Airspace software will locates all Airway/MOCA routes and determine if your proposed structure is within the boundary of the protected flight path. ![]() These facilities are called Very High Frequency Omni-Range or VOR for short. Airways extend between electronic navigation facilities maintained by the FAA. The secondary area begins on the outside edge of the primary area. ![]() Airways have a primary area width of 8 nautical miles and 2 nautical miles in the secondary area. There are approximately 45,000 miles of Federal Airways covering the United States. (a)(4) A height within an en route obstacle clearance area, including turn and termination areas, of a Federal airway or approved off-airway route, that would increase the minimum obstacle clearance altitude. ![]() Regulations covering protection airway routes is specified in the Federal Aviation Regulation (FAR):įAR Part 77.23 Standards for determining obstructions. The Minimum Obstacle Clearance Altitude is the lowest published altitude in effect between radio fixes on VOR Airways, off airway routes, or route segments which meets obstacle clearance requirements for the entire route segment and which assures acceptable navigational signal coverage only within 25 SM (22NM) of a VOR. Determining if you are located within a MOCA
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