What is the slope of the Approach-Departure Clearance Surface?

The slope of the Approach-Departure Clearance Surface is established at a ratio of 50:1. This means that for every 50 units of horizontal distance from the centerline of the runway, the clearance surface rises one unit vertically. This ratio is important as it ensures that there is enough vertical space for aircraft to safely depart and approach the runway without encountering obstacles.

The 50:1 slope is consistent with regulatory guidelines and is crucial for maintaining safe aircraft operations near airport environments. Understanding this slope helps pilots, air traffic controllers, and airport planners ensure that there are no obstructions within the defined clearance area, contributing to safer flight operations during takeoff and landing phases.