Conical Surface . This is an inclined surface extending outward and upward from the outer periphery of the inner horizontal surface for a horizontal distance of 7,000 feet to a height of 500 feet above the established airfield elevation . The slope of the conical surface is 20:1 .
Outer Horizontal Surface . This surface is a plane located 500 feet above the established airfield elevation . It extends for a horizontal distance of 30,000 feet from the outer periphery of the conical surface .
Transitional Surfaces . These surfaces connect the primary surfaces , Clear Zone surfaces , and approach‐departure clearance surfaces to the outer horizontal surface , conical surface , other horizontal surface , or other transitional surfaces . The slope of the transitional surface is 7:1 outward and upward at right angles to the runway centerline . To determine the elevation for the beginning of the transitional surface slope at any point along the lateral boundary of the primary surface , including the CZ , draw an angle to the runway axis . The elevation at the runway centerline is the elevation for the beginning of the 7:1 slope .
ISSUE VO‐1
Vertical Obstructions in conflict with Imaginary Surface criteria in the City of Biloxi There are structures including telecommunication towers within the City of Biloxi that exceed height restrictions per the DoD Imaginary Surfaces criteria .
Awareness of various vertical obstructions and how they can impact the installation ’ s operations and missions is needed to limit encroachment within jurisdictions surrounding a military installation . General development , power lines , wind energy projects or any other structures capable of causing incompatible development can ultimately degrade an
installation ’ s mission capability . Additionally , c create vertical obstructions within the Keesler A which can disrupt military operations and the m existing cell towers in Biloxi , there is a concern be incompatible with the Imaginary Surfaces he
Incompatible maximum heights within a jurisdic obstructions for both military and civilian aviati development is located within areas where mili Incompatible development can include natural within line‐of‐sight areas or within the Imaginar Approach‐Departure Clearance Surfaces associa Keesler AFB .
Compatibility Assessment The Biloxi Land Development Ordinance include
Airspace Overlay district . The section states tha the federal obstruction standards contained in relate to the primary surface , approach clearan surface , outer horizontal surface , conical surfac Subsection 5 of the Overlay District requires an applications including a Certificate of Zoning Co Permit , Temporary Use Permit , or Sign Permit .
The Imaginary Surfaces associated with the airf all directions form the installation into the City 50:1 slope ( 1 vertical foot for every 50 horizont Departure Clearance Surface plateauing at 500 at 150 feet , Transitional Surface with a slope of 7 horizontal feet ), Conical Surface with a slope o every 20 horizontal feet ), and Outer Horizontal the established airport elevation ( EAE ). Objects
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