*Since its introduction in Europe in 2000, TCAS II version 7.0 has been the subject of monitoring. In the course of analysing recorded and reported events, many cases were found in which pilots did not respond correctly to the “Adjust vertical speed, adjust” Resolution Advisories (RAs) – the vertical rate was increased rather than reduced.
Additionally, there have also been a number of cases in which TCAS II version 7.0 failed to reverse an RA when two converging aircraft remained within 100 feet. This type scenario would be occur when one aircraft is not following the RA or is not TCAS II equipped and follows an ATC instruction or performs an avoidance manoeuvre based on visual acquisition.

The development of version 7.1 was initiated by EUROCONTROL following the discovery of two safety issues with the current TCAS II version. (*www.eurocontrol.int)

BAE Systems have introduced TCAS II 7.1 across the OEM Fleet Bae146 (all variants), AVRO RJ (all variants) and ATP as well as Boeing 737 series and Boeing 757

EU Commission Regulation (Implementation Rule)1332/2011 mandates that aircraft operating in European Airspace with an individual certificate of airworthiness first issued prior to March 2012 are equipped with ACAS/TCAS II Equipment with Logic Version 7.1 by 1st December 2015. Other areas of the world are likely to mandate this in the near future.

This modification is available directly for all EASA – Type certificated aircraft (EASA AFM). Approval of TCAS II 7.1for non-EASA Type Certificated aircraft can be obtained to meet customer demand on request.

What equipment must be changed?

Replacement of the existing TCAS II computer with a change 7.1 compliant TCAS II computer i.e. Rockwell Collins TTR-921 or ACSS TCAS-2000 V7.1 or software upgrade to existing hardware.

BAE Systems supply a fully managed solution delivering to an agreed program created to integrate fully with your Aircraft schedule.