Safety Assessment for Temporary Displaced Threshold

A European international airport is planning essential pavement replacement works at one end of its single runway. To enable the planned construction, the runway threshold is expected to be temporarily displaced, which will reduce the available runway length and require the closure of two associated taxiways. To ensure safe operations during the planned construction phase, the airport relied on airsight to carry out a safety assessment in accordance with ADR.OR.B.040 requirements.

The assessment evaluated the anticipated impacts of the proposed changes, including effects on runway operations, ground movements, and support systems. It also considered potential conflicts and flow disruptions within the system resulting from the closures. Potential risks such as pilot misinterpretation due to altered visual cues, incorrect take-off or landing performance calculations, NAVAID signal interference, dust and FOD contamination, increased bird activity, and possible infringements of obstacle limitation surfaces due to the construction site were systematically identified and analysed. Additionally, access to one runway end would be limited, requiring aircraft to perform runway turns and backtracking. Potential risks related to the inability to safely perform these turns were also assessed. 

The evaluation took a comprehensive view of the system, including weather conditions, available flight procedures, construction procedures, and other relevant factors.

Mitigation measures were proposed, including updates to aeronautical publications, adjustments to visual aids, stakeholder coordination and the implementation of targeted operational controls.

airsight’s Expertise

This project demonstrates airsight’s capability in delivering complex safety assessments for planned infrastructure works at busy international airports. Our interdisciplinary team combines regulatory expertise, operational insight, and advanced tools to deliver practical and tailored solutions.
By applying a structured methodology and engaging closely with stakeholders, airsight ensured that all relevant risks were proactively identified and addressed to support the safe planning of future airport operations during construction.

Why It Matters

As airport infrastructure ages and air traffic increases, operators must often plan major works while continuing operations. Temporary changes such as displaced thresholds or infrastructure closures can significantly affect safety, efficiency, and regulatory compliance.

airsight provides customised safety assessments that support airports in planning infrastructure upgrades with minimal disruption. With experience across a wide range of airport environments, from regional airfields to major international hubs, our team brings together operational expertise, regulatory alignment, and industry best practices on every project and is happy to support you with your challenges.