This document defines the minimum technical specification for a 1090 MHz Extended Squitter ADS-B Surveillance System. The ADS-B System is the “SUR Sensor” element of an infrastructure supporting ATS Surveillance Service(s), such as the Approach Control and Area Control Services within the European Air Navigation Region. Revision C has been updated to be compliant with the SPI-IR (EU No 1207/2011) for ADS-B Surveillance Systems. It will contain a partial implementation of ADS-B Version 3 as defined in ED-102B/DO-260C in line with Edition 2.6 of ASTERIX Category 021. It has also been adapted to support the provision of System Status Reports in line with ASTERIX Category 025.