Starting March 20, 2025, a new procedure will be introduced at the Langen FIR as part of a temporary trial operation. This is due to the fact that the Flight Information Service (FIS) frequently reaches its capacity limit due to increasing demand and very large FIS sectors. The procedure was published in the AIP VFR with AIC 01/25.
With the new procedure, pilots communicate their constant listening readiness via the FMC circuit. The FIS controller can contact the pilot via broadcast or on a case-by-case basis if necessary and provide them with specific information.
The prerequisites are:
- Setting the frequency 123.525 MHz (Langen Information)
- Setting the FMC 3701
- Maintaining constant listening watch
It is possible to establish a corresponding radio connection with FIS in the usual way at any time if the pilot deems it necessary.
The trial operation extends exclusively to the Langen Information area on the frequency 123.525 MHz. When terminating listening readiness or leaving the airspace, the transponder must be automatically switched back to SSR code 7000.
https://www.dfs.de/homepage/de/medien/ifr-vfr-informationen/vfr-informationen/aic-1-25-probebetrieb-frequency-monitoring-code-in-fir-langen/begleitinfo-zum-fmc.pdf?cid=j5q
As a reminder, in the Brussels FIR (except Luxembourg), you may monitor the FIS frequency 126.900 MHz and set the Transponder code 5101, allowing pilots to monitor the frequency without calling in.
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