The obstacle-free zone (OFZ) is a 3D volume of airspace below 150 feet (46 m), above the established airport elevation which protects for the transition of aircraft to and from the runway. The Obstacle Free Zone (OFZ) clearing standard precludes taxiing and parked airplanes and object penetrations, except for frangible navigation aid (NAVAID) locations that are fixed by function. It is centered above the runway and the extended runway centerline and is intended to provide clearance protection for aircraft landing or taking off from the runway and for missed approaches. The OFZ is subdivided into:
- Runway OFZ, the airspace above a surface centered on the runway centerline
- Inner-approach OFZ, centered on the extended runway centerline and applicable only to runways with an approach lightning system
- Inner-transitional OFZ, the airspace above the surface located on the outer edges of the runway OFZ ad the inner-approach OFZ and applicable only to runways with an approach visibility minimum lower than ¾ of mile
Famous quotes containing the words obstacle, free and/or zone:
“But this we know, the obstacle that checked
And tripped the body, shot the spirit on
Further than target ever showed or shone.”
—Robert Frost (1874–1963)
“Naw, you don’t want to eat it, you just sit there and watch. It’s a free prison.”
—Bryan Forbes (b. 1926)
“In the zone of perdition where my youth went as if to complete its education, one would have said that the portents of an imminent collapse of the whole edifice of civilization had made an appointment.”
—Guy Debord (b. 1931)