Slående resultater fra Eurocontrol viser at nesten 50% av alle TCAS RAs ikke følges korrekt. I mange tilfeller manøvreres det også motsatt vei av hva systemet ber om.
I IFALPAs orienteringshefte(briefing leaflet) kan følgende leses:
"The Eurocontrol study analysed radar data of TCAS RA events taken over a 12 month period over the core area of Europe. In a first analysis, it reports only 38% of the RAs were followed correctly, and 34% were even manoeuvred in the opposite direction. Although a second analysis with a less rigid methodology puts the accuracy of radar recordings into perspective, 45% of the RAs were still not followed correctly. The results of the studies continue to cause concern with the “TCAS RA not followed” being one of the top 5 ATM operational risk priorities."
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