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Front mission 2 call signs6/6/2023 Larger operators with high flight densities in particular airspace should consider routinely using a combination of numeric and alphanumeric call sign formats.Failure of operator to give sufficient consideration in allocation of RTF call signs.The workload of ATCOs and pilots is increased due to the necessity to resolve the confusion.The intended recipient does not receive the clearance, and fails to take up the desired heading or routing, or fails to climb or descent to the desired level or,.In responding to the message, the aircraft blocks a transmission from the intended recipient or,.The aircraft departs the RTF frequency or,.The aircraft commences a climb or descent to a level to which it has not been cleared or,.The aircraft takes up a heading or routing intended for the other or,.Typical ScenariosĪn aircraft receives and acts on a clearance intended for another aircraft, in consequence of which: These involve reviewing company call signs to ensure that aircraft with similar call signs are not likely to be routinely in the same airspace at the same time, and a process to systemmatically resolve ongoing issues arising from reports of similar call signs from their flight crew, ANSPs or other operators. Many larger airlines operate call sign de-confliction programmes. Loss of communication, loss of separation, level bust, AIRPROX, or midair collision. RUSHAIR 25LL for a flight inbound to London Heathrow) Alpha-numeric call signs end in two letters which correspond to the last two letters of the destination’s ICAO location indicator (e.g.Call signs contain repeated digits (e.g.Call signs coincidentally contain the same alphanumeric characters in a different order (e.g.Airlines schedule flights with similar call signs to be in the same airspace at the same time.Airlines allocate commercial flight numbers as call-signs these are normally consecutive and therefore similar (e.g.The following are some examples of the more common causes for call sign confusion: This hazard is usually referred to as “call sign confusion”. The use of similar call signs by aircraft operating in the same area and especially on the same RTF frequency often gives rise to potential and actual flight safety incidents.
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