Runway Threshold

Runway Markings, including Runway Threshold

Runway Threshold Full refers to the point at the beginning of a runway designated for landings, marked by specific markings and lights, indicating the start of the available landing distance. Historically, thresholds were simply the physical beginning of the runway, but now they can be displaced to clear obstacles or for other operational reasons.

Key Details

Definition

The runway threshold is the point where the runway pavement begins and is available for landing, marked by specific markings and lights.

Markings

• Threshold Markings: These are white stripes that run across the runway, indicating the beginning of the landing area.
• Threshold Lights: These are green lights that are visible from the approach side of the runway, marking the threshold.

Displaced Thresholds

• Purpose: In some cases, the threshold is displaced, meaning it's located at a point on the runway other than the designated beginning.
• Reasons for Displacement: Displacements are often necessary to clear obstacles in the approach path or to provide more runway length for takeoffs.
• Markings for Displaced Thresholds: A white bar is located across the width of the runway at the displaced threshold, and white arrows are located along the centerline in the area between the beginning of the runway and displaced threshold.

Historical Context

• Initially, runway thresholds were simply the physical beginning of the runway pavement.
• As aviation technology and safety standards evolved, the concept of displaced thresholds emerged to address obstacles and improve operational flexibility.

Importance

• The runway threshold is a critical element of airport infrastructure, serving as the gateway for safe aircraft landings.
• Its clear demarcation and illumination are vital in guiding pilots during the landing approach, ensuring operational safety, and facilitating efficient runway use.