Between 25 and 30 August 2025, calibration flights will be used to assess the navigation systems operated by Skyguide at Zurich Airport. Specifically, this concerns the instrument landing systems (ILS) and the rotating radio beacons (VOR/DME). The calibration flights will take place both at night, after the end of normal flight operations, by no later than 2:00, and in the afternoon.

The navigation systems are tested periodically to ensure their accuracy. Approaches to the side, above and below the published flight path are required to check the instrument landing systems. Some of the calibration flights will therefore also occur outside the usual approach routes. The reception of the rotating radio beacons must also be tested at greater distances. For this reason, calibration flights will also pass over areas far outside the airport area. The signals received by the aircraft from the corresponding navigation systems will be recorded and evaluated.

A twin-engine Beechcraft King Air 350 propeller aircraft will be used for the calibration flights. The aircraft is equipped with state-of-the-art navigation instruments and a high-precision flight measurement device. Skyguide air traffic control is responsible for the planning and execution of the flights.