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241) The ATCRBS is extraordinarily limited with its need for air traffic controllers to physically monitor radar screens and relay verbal instructions to pilots, (242) suffering through eleven second blip delays alerting controllers to only periodic coordinates of flying aircraft, (243) and is unavailable in various global areas where radar beacon system coverage does not exist.
The TIS "self-alert" problem is actually due to the discovery in the mid-90s that a few general-aviation ATCRBS transponders didn't respond to interrogations from Mode S ground radars.
The unit provides 10 selectable/programmable scenarios, a programmable parameter for intruder simulation and the surveillance monitor displays Mode S or ATCRBS interrogations.