Airport Conical Surface

What is an Airport’s Conical Surface?


Each runway configuration has several imaginary surfaces, one being called a Conical Surface that exists primarily to prevent existing or proposed manmade objects, objects of natural growth or terrain from extending upward into navigable airspace.


A basic definition of an Airport Conical Surface is an imaginary surface which extends upward and outward from the outer limits of the Horizontal Surface for an additional, horizontal distance of 4,000 feet at a slope of 20:1 measured in a vertical plane.  At 4,000 feet from the horizontal surface, the elevation of the conical surface is 350 feet above the established airport elevation.


The Federal Aviation Administration (FAA) will frequently issue a Notice of Presumed Hazard or a Determination of Hazard in response to an FAA Form 7460-1 filing for any proposed structure that penetrates the Airport’s Conical Surface. 


Once a sponsor has received an unfavorable determination based upon the penetration of an Airport’s Conical Surface, it would be prudent to engage an aviation consultant who has extensive expertise in developing innovative and workable solutions that will either allow them to develop their structure as planned or that will mitigate the FAA’s issues resulting in a favorable determination.


Williams Aviation Consultants Inc. has been very successful in receiving a favorable determination from the FAA for our clients that had previously received a Notice of Presumed Hazard or a Determination of Hazard.


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