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Short answer ICAO recommendations include a protection for same-frequency navaids, restricting the received power of undesired stations to a level preventing interferences. To meet this restriction same-frequency stations must be considerably distant. The result, in normal conditions, is the receiver cannot switch uninterrupted from the current station to a ...


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#1 I don't know. #2 On December 20, 1995 American Airlines 965 crashed into a mountain top near Cali Columbia when it was flying down the the valley between mountains and the 757 autopilot turned the aircraft left to follow the loaded flightplan... the flightplan was loaded with an NDB called "R". The problem was that the "R" they ...


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