Haneda air traffic control missed warning alert in JAL collision

The team also has a monitoring system that warns if a plane has entered a runway at the same time another aircraft is preparing to land. The visual support system flags the risk by blinking an indicator on the monitor screen, but the equipment does not provide an audible alert.

The runway monitoring system was working properly at the time of the accident, but the air traffic controllers apparently failed to notice the blinking indicator, according to a source close to the transport ministry.

Japan plans to adopt a response as soon as Tuesday after the three-day weekend, Transport Minister Tetsuo Saito said Friday. As a first step, extra staff will be assigned to air traffic control teams starting Saturday to keep constant watch on the runway monitoring system.