Several cases of AIRPROX have been reported by an ANSP due to pilots reading back a clearance not intended for them at the same time as the pilot for whom the clearance was intended. The ATCO did not detect the error because the transmission was hidden (technical systems transmitting best signal only). Other agencies have reported similar occurrences.
ANSPs, Regulators, Aircraft Operators and the EUROCONTROL Agency should continue the work on reducing the risk associated with similar callsigns;
ANSPs should provide their controllers with detailed information on RTF cross-coupling and Best Signal Selection functionality if used, including the process itself, how it should be used and the problems inherent in the system;
When multiple RTF channels are coupled, priority should be given to duplex coupling (allowing audible simultaneous transmission) rather than simplex coupling;