Where is the Glideslope positioned on a runway?

Where is the Glideslope positioned on a runway?

• A. At the runway centerline
• B. Typically at least 250 feet from the centerline and 1,000 feet from the runway threshold
• C. At 500 feet from the threshold
• D. Outside the RSA

Answer: (B)

The Glenway path is set off to the side of the runway, not on the centerline, and its position is fixed relative to the threshold to ensure a usable vertical guidance signal. Placing the glideslope antenna at least 250 feet from the runway centerline keeps the beam clear of the runway’s surface features and lighting, and helps shape the signal so it arrives at aircraft in a well-defined, narrow glide path. Positioning it about 1,000 feet from the threshold ensures the glide path is established early enough on approach for pilots to intercept at a practical height, giving a stable 3-degree descent angle as they near the runway.

The Glenway path is set off to the side of the runway, not on the centerline, and its position is fixed relative to the threshold to ensure a usable vertical guidance signal. Placing the glideslope antenna at least 250 feet from the runway centerline keeps the beam clear of the runway’s surface features and lighting, and helps shape the signal so it arrives at aircraft in a well-defined, narrow glide path. Positioning it about 1,000 feet from the threshold ensures the glide path is established early enough on approach for pilots to intercept at a practical height, giving a stable 3-degree descent angle as they near the runway.