Skyguide restores air traffic control after technical glitch

Skyguide has restored normal operation of its air traffic control systems, after a technical fault disrupted surveillance and briefly interrupted departures and arrivals in Zurich and Geneva. The organisation has raised capacity to 80% and plans to return to full capacity after a 24-hour stabilisation phase.

The fault prompted Skyguide to cut airspace capacity by half as a precaution. The temporary limit on traffic has now eased, but a 20% restriction remains while the systems are monitored for reliable operation. Skyguide warned that the reduced capacity could still cause delays. The disruption affected the radar imagery used to track aircraft movements, a core part of the organisation’s work managing Swiss airspace. Skyguide says its experts have identified the cause of the fault and that safety in Swiss airspace is guaranteed.

A radar-image fault triggered the precautionary restrictions. The problem affected the system that generates the imagery controllers use to monitor aircraft movements. Skyguide initially halved capacity in Swiss airspace while the surveillance issue was addressed.

The fault briefly halted take-offs and landings at Zurich and Geneva airports, disrupting operations at Switzerland’s two main international gateways. Skyguide has since increased capacity to 80%, but the remaining limit means flights may still face delays during the stabilisation period. The radar imagery system is central to tracking aircraft in the airspace Skyguide manages, and the organisation says experts have now identified the technical fault’s cause. The systems are operating normally again, while the temporary capacity restriction gives Skyguide a further 24 hours to ensure they continue to operate reliably.

Skyguide cut capacity as a safety precaution after the surveillance system failed. The organisation first reduced airspace capacity by 50%, then raised it to 80% once its experts had identified the cause and the systems returned to normal operation.

Skyguide says safety in Swiss airspace is guaranteed and reports no indications of a cyberattack. The remaining 20% restriction is intended to help ensure the systems keep operating reliably. It will stay in place for a 24-hour stabilisation phase, after which Skyguide intends to restore full capacity. The staged return marks a shift from the initial response to continued monitoring. Skyguide’s immediate measures focused on managing aircraft movements at reduced capacity while it dealt with the fault in the system that generates radar imagery.

The remaining restriction could mean delays until Skyguide completes its 24-hour stabilisation phase. Capacity currently stands at 80%, with the organisation planning to restore full capacity once the systems have continued to operate reliably through that period.

The fault briefly interrupted take-offs and landings at Zurich and Geneva, and Skyguide’s reduced capacity may continue to affect flight schedules. The organisation has moved beyond the initial halving of airspace capacity, but has retained a temporary limit while it checks system reliability. For passengers travelling through Switzerland’s two airports, the operational picture is therefore improved, though delays remain possible. Skyguide says its systems are now operating normally and that safety in Swiss airspace is guaranteed. Full capacity is the next planned step after the stabilisation phase.