Important limitations of map-based weather products are low spatial and temporal resolution, lack of exact vertical information and poor format. Also airborne weather radar technology has some severe limitations e.g. no detection of Clear Air Turbulence (CAT), no detection of weather behind severe hazards, and no prediction on location, growth and maturity of hazards. Moreover, it is not easy for the flight crew to cognitively integrate all provided weather information in a coherent picture, due to the varying coverage area, resolution, update rate, and product life. Furthermore, also the traffic collision and terrain avoidance systems like TCAS and TAWS have significant limitations with respect to relevant information provision and display formats.

Safety studies were another source to find reasons for the necessity to improve the current systems. Therefore, various weather, traffic and terrain safety studies have been performed. The resulting causal and contributing factors of accidents and incidents, especially those related to surveillance, have been collected in a list. Important hazards found were flight crew errors (including failure to comply with ATC instructions, for instance due to a lack of situational awareness, mis-interpretation or mis-execution of ATC instructions), ATC- flight crew communication hazards, and lack of compliance with procedures. The list was used to propose so-called FLSYAFE solutions to address the issues.

The FLYSAFE NG ISS is expected to operate in the timeframe 2010-2015. The foreseen ATM developments have been investigated. The major impacting aspects are the usage of datalink (ADS-B) on large scale and the shifting of responsibility for traffic separation from the controller to the pilot, by the introduction of the ASAS Package 1 applications. Also operations of UAV’s inside civil airspace will have become normal practice.

Based upon the expected developments in the ATM concept for 2010-2015 and the surveillance related hazards, the limitations of the current surveillance system were identified. A description of needed changes is given and functional requirements derived for the FLYSAFE next generation surveillance system were set up. The functional requirements are grouped in weather, traffic, terrain, general and miscellaneous requirements.

This document will be used as input for the specification in WP 1.2, for the certification basis analysis WP 1.3 and as input for the scenarios definition in WP 6.1.