Night-time flights to calibrate instrument landing system (ILS)


The next flight session to calibrate Geneva Airport’s navigational aids will take place this evening, 20 September 2021, subject to the weather conditions prevailing at this time. The operation could last for three nights. Daytime calibration flights will also be carried out during the week on 22, 23 and 24 September 2021.

Based on the weather conditions, night flights during this session are scheduled for the following dates:
- Night of 20 to 21 September 2021
- Night of 21 to 22 September 2021
- Reserve night: night of 22 to 23 September 2021
As a result of the significant drop in traffic in Europe this spring due to the Covid-19 pandemic, these calibration flights were carried out exclusively during the day.
For this test session, night as well as day flights are scheduled as follows:
  • 22 September 2021 from 13:00 to 17:00
  • 23 September 2021 from 13:00 to 17:00
  • 24 September 2021 from 13:00 to 17:00
International civil aviation standards require that the proper functioning and accuracy of navigation aids at airports be checked regularly. For this purpose, a specially equipped aircraft is used to carry out a series of approaches.
In Switzerland, calibration flights for navigation aids (Instrument Landing System (ILS) and Very high frequency Omnidirectional Range (VOR) are carried out under the auspices of Skyguide, the authority in charge of airspace surveillance.

These calibration flights usually take place at night as they are likely to disrupt air traffic. In December 2020, Geneva Airport submitted an application to the Federal Office of Civil Aviation (FOCA), which was accepted.