SC-147, Traffic Alert & Collision Avoidance System (TCAS), established November 1, 1980, has defined and updated the TCAS and TCAS II performance standards, thereby contributing to one of the most significant advances in aviation safety in the past twenty years.

The committee has started work on a new Aircraft Collision Avoidance System for NextGen, or ACAS X.  The foundational system to be specified will be ACAS XA, with the “A” denoting active surveillance. ACAS XA will be a “drop-in” replacement for TCAS II; expected MOPS completion date – December 2018.


Co-Chair J. Stuart Searight Federal Aviation Administration
Co-Chair Ruy Brandao Honeywell International, Inc.
WG-75 Co-Chair Bill Booth EUROCONTROL
Government Authorized Representative Sheila Mariano Federal Aviation Administration
Secretary Donna Frohlich Aurora Sciences LLC
Program Director Al Secen RTCA, Inc.


General Information

Terms of Reference June 27, 2019
Next Meeting Agenda December 5, 2019
2019 Meetings March 7, 2019
April 25, 2019
June 13, 2019
August 8, 2019
September 19, 2019
December 5, 2019


Recently Completed Documents

DO-385 Minimum Operational Performance Standards for Airborne Collision Avoidance System X (ACAS X) (ACAS Xa and ACAS X0)  September 2019



2018 Meetings March 8, 2018
May 18, 2018
August 9, 2018
2017 Meetings December 7, 2017
September 21, 2017
2016 Meetings March 17, 2016
September 26-29, 2016
2015 Meetings January 13-15, 2015
July 14-15, 2015
September 24, 2015


For additional meeting summaries, please contact the Program Director: Al Secen