Abstract
In this document, interfaces between pilots in a cockpit and Air Traffic Controllers (ATC)
are discussed using the aircraft accident investigation reports by Japan Transport Safety Board. Specially
in the case of near midair collision, TCAS (Traffic Alert and Collision Avoidance System) RA
(Resolution Advisory) issued both in aircraft A and aircraft B, but ATC could not get TCAS information
through their radar system. So possibility of TCAS data downlink from aircraft to radar display
in ATC was discussed. Simultaneously usability of reminders in ATC system was discussed. There
existed some gaps between controllers working position and the displays of reminders.
