Obstruction clearance plane definition
Obstruction clearance plane means a plane sloping upward from the runway at a slope of 1:20 to the horizontal, and tangent to or clearing all obstructions within a specified area surrounding the runway as shown in a profile view of that area. In the plane view, the centreline of the specified area coincides with the centreline of the runway, beginning at the point where the obstruction clearance plane intersects the centreline of the runway and proceeding to a point at least 450 m (1,500) feet from the beginning point. Thereafter, the centreline coincides with the takeoff path over the ground for the runway (in the case of takeoffs) or with the instrument approach counterpart (for landings), or where the applicable one of these paths has not been established, it proceeds consistent with turns of at least 1.2 km (4,000 foot) radius until a point is reached beyond which the obstruction clearance plane clears all obstructions. This area extends laterally 60 m (200 feet) on each side of the centreline at the point where the obstruction clearance plane intersects the runway and continues at this width to the end of the runway; then it increases uniformly to150 m (500 feet)
Obstruction clearance plane means a plane sloping upward from the runway at a slope of 15:1 to the horizontal and tangent to or clearing meeting the appropriate requirements to clear all obstructions within a specified area surrounding the runway as shown in a profile view of that area. For federal aid airports the slope of the plane is 20:1.
Obstruction clearance plane means a plane sloping upward from the runway at a slope meeting the appropriate requirements to clear all obstructions within a specified area as shown in a profile view of that area.