The main purpose of this document is to present the result of the assessment of pilot compliance with TCAS RAs, TCAS mode selection and TCAS serviceability. Radar recordings from core European airspace were used to conduct this assessment. Analysis indicate that resolution advisories are often not flown correctly. Moreover, a number of aircraft operate daily in core European airspace with TCAS out of service or with TCAS in a TA-only mode. In all these cases TCAS does not offer the intended collision avoidance protection.\r\n\r\nEdition 2.