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 a line from this point to the runway centerline . This line will be at right angles to the runway axis . The elevation at the runway centerline is the elevation for the beginning of the 7:1 slope .
ISSUE VO‐1
Infrangible fence The adjacent property north of the runway on the east side of Travis AFB has erected an infrangible fence , right up against the Base fence . Fencing at the end of the runway must be frangible in the event a mishap was to occur upon landing or takeoff .
A private property owner constructed an infran runway , to keep cattle on the property . The fen existing frangible fence built and maintained by The construction of the private infrangible fenc creates a safety hazard for potential collisions . requirement only applies to structures and prop the Air Force . The UFC 3‐260‐01 recommends i owners whose land falls within the MFZ , encour frangible items .
Findings
• The infrangible fence creates an obstruct northeast end of the runway .
• UFC frangibility requirements cannot be not controlled by the Air Force and Travis construction of frangible objects on priva
Compatibility Assessment
The DOD Unified Facility Criteria ( UFC ) 3‐260‐01 , Airfield and Heliport Planning and Design , establishes a Clear Zone Mandatory Frangibility Zone ( MFZ ) for the Air Force that extends through the land use control area to the end of the clear zone . Items that must be sited there due to their function must be made frangible to the maximum extent possible . A frangible structure must be designed using materials that will either break into segments or shatter without impaling the aircraft skin or becoming an obstacle to the continued movement of the aircraft .
TSS Background Report