Zipper Closure (Runway)

Zipper Closure (Runway) refers to a temporary or partial runway closure method employed during maintenance, construction, or repair operations. The concept allows a section of the runway to remain open and usable by aircraft, while work is conducted safely on another portion, minimizing operational disruptions.

Purpose

• Maintain airport operations while critical runway work is underway.
• Maximize runway availability and minimize flight delays.
• Ensure the safety of construction crews and aircraft simultaneously.

How It Works

• The runway is divided into sections, similar to the teeth of a zipper.
• One or more segments are temporarily closed while the remainder remains operational.
• As work progresses, the closure moves sequentially across the runway, much like unzipping or rezipping.
• Notice to Air Missions (NOTAMs) are issued specifying operational limitations, thresholds, or displaced thresholds.

Applications

• Surface Repairs: Asphalt replacement, crack sealing, or grooving.
• Lighting and Electrical Work: Repairs or installation of runway edge lights, centerline lights, or guidance systems.
• Pavement Rehabilitation Projects: Full-depth resurfacing executed in phases.

Benefits

• Reduces airport disruption compared to full runway closures.
• Allows continued arrivals, departures, and taxi operations with minor adjustments.
• Improves construction efficiency by enabling work on active runways under controlled conditions.

Operational Considerations

• Aircraft performance calculations must account for reduced available runway length (Landing Distance Available or Takeoff Distance Available).
• Taxiway adjustments or temporary signage may be necessary.
• Pilots and controllers require enhanced situational awareness to manage operations near active work zones.

Summary

Zipper closures offer airports a flexible strategy to balance the need for infrastructure maintenance with the demands of continuous flight operations. They ensure work can proceed safely while minimizing impacts on flight schedules and airport efficiency.