Pilot changes radio frequency when

1. There are disturbances on the primary frequency
2. ✓In controlled airspace: when he was told to do so by ATC. In uncontrolled airspace: when he intends to enter airspace of another, territorially compenent ATC or when he was told to do so by the ATC he is currently communicating withCorrect answer
3. Considers that he should change the frequency corresponding to the route
4. There is no answer to the first call

Explanation

In controlled airspace, pilots must maintain a continuous listening watch on the designated frequency and change only when instructed by Air Traffic Control…

🔒 The full EASA/ICAO explanation is available in the app.

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