The job of a controller is to keep planes at a safe distance from each other. The FAA has a new electronic air traffic control monitoring system that tracks controller error.
The new system has revealed serious errors made by controllers have been underestimated. The new system is augmented by electronic surveillance and controller self-reportage.
Controllers made 41 high risk errors out of a total 4,394 errors last year. That is two times the errors in 2010 and three times those in 2009.
We should consider that of 132 million flights handled, 41 serious errors is a small percentage of error. Of course, it is only a good thing that the FAA is working on reducing errors.