The following study deals with this analysis of RA downlink data originating from six Mode-S radars with a coverage including most of the European core area. The data were collected from September 2007 to March 2008. This represents a little more than 1,300,000 flight hours.

This document summarises the PASS monitoring activity. It reports on the sources and tools used for the data collection, explains how the various analyses were performed, provides the results of the analyses and outlines how those results will be used in the next PASS activity: the modelling phase.
The present report addresses only general patterns in the airspace monitored as a whole, as contributed by all ANSPs, with all sensitive data de-identified.

This document reports the European STCA environment. It provides a generic description of the features of an STCA system. Additionally it provides details of specific STCA implementations taken from a variety of sources: published material, information from the SPIN survey, expert knowledge and replies to requests for information from individual ANSPs.

This document provides the specifications for the controller and pilot models required to complete the PASS simulation framework. The design choices are explained and illustrated as much as possible.

This documents provides background information on the role of STCA in the ATM system and existing guidance material to evaluate its performance aspects. It then describes a set of key performance areas and associated metrics for use within PASS Working Area 2.

This document provides some elements on the role of STCA and ACAS as safety nets in the current ATM environment, and on the evaluation of their performances. It recaps the outcome of the “IAPA – ASARP Methodology for Safety net Assessment – Feasibility Evaluation” (I-AM-SAFE) study and gives some insight into the simulation process that has been set up to adapt the ACAS encounter model-based methodology to the context of STCA. Additionally, the document contains the most significant results of the evaluation of STCA performance that has been conducted on a number of operational scenarios using simple assumptions at this stage, yet representative of current STCA operation in Europe.

The objective of this operational safety assessment Interim Report in Work Area 4 is to address the “failure” approach. The “success” approach (prevention of accidents) will be covered during the PASS fast-time simulations that will take place in Phase 3, as it is intended: “to compare the “initial” severity of the encounter without the effect of the controller’s instruction prompted by STCA and the “final” severity resulting from the pilot’s response to the controller’s instruction”.

Within the PASS project, the monitoring activity aimed at giving solid operational grounds to the development of STCA performance requirements and a concept of joint operations for STCA and ACAS, by looking at current ATM operations involving safety-nets. In particular, the monitoring activity collected 180 occurrences and computed a number of performance metrics. This report adds specific details about TCAS reports from pilots of pairs of aircraft involved in occurrences where at least one aircraft got an RA. Note that the same constraint applies to this subset as to the whole set of 180 occurrences, i.e. that they are biased towards the most challenging ATM situations.

This paper was presented at the EUROCONTROL Annual Safety R&D Seminar in Southampton in October 2008. It contains the initial results from the monitoring of safety-net related occurrences on-going in the PASS study and the setup of the modelling activities building on the outcomes of the I-AM-SAFE feasibility study.