October 6, 2011 - RTCA

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Agenda Item 4.b ASIAS/CAST/CAS Steering Committee There were no discussions under this agenda item. Agenda Item 5. Working Group Status Reports Agenda Item 5.a Requirements Working Group (RWG) Andy Zeitlin provided a summary of the RWG’s work since the last Plenary meeting. The main focus is preparing a report on future collision avoidance systems and work on that report has been completed. Andy’s report provided an overview of the contents and recommendations from the report. The report identifies both near-term and long-term improvements that could be incorporated into the collision avoidance logic. The contents of the report were reviewed this week by the RWG and the RWG is in agreement with the current version of the report. Following the completion of a few editorial cleanup changes, the report will be ready for distribution to the Committee for review and comment. To support the delivery of the report to the Program Management Committee (PMC) in December 2011, the following distribution and review schedule was agreed to during the meeting. Initial Distribution October 19, 2011 Comments Due Back to Andy November 7, 2011 Telecon/Webex to Review Comments November 9, 2011 Deliver to PMC November 30, 2011 Agenda Item 5.b Surveillance Working Group (SWG) Ruy Brandao provided a status report on the SWG’s work. Since the last SC-147 meeting, work has continued to develop and evaluate means of reducing the TCAS utilization of the 1090 MHz frequency. A simulation model that was previously developed was updated to incorporate all six specific change proposals and testing was done with all of the various proposals. Simulations show that Changes to DO-300 would result in 1090 MHz utilization reduction of 60% to 85% when all simulated TCAS II equipped aircraft have these changes implemented. Additional change proposals have been defined which would further reduce the contributions of on-ground TCAS to 1090 MHz utilization. Evaluation of the benefits of these changes is expected to be complete by the end of the year. Safety studies do not show any degradation in risk ratio when these changes are implemented. The SWG recommended that the Terms of Reference be amended to allow incorporation of these changes in the MOPS. The SWG will continue work on the change proposals under the assumption that the Terms of Reference will be updated. This may result in changes to DO- 185B, DO-300, or both. The SWG also proposed allowing TAs to be issued based solely on ADS B data (for hybrid surveillance equipped aircraft) if the intruder was not already being interrogated and then switching to active interrogations immediately after the TA was issued. The Committee agreed with this proposal. 4
The SWG also sought the Committee’s input on a change proposal to limit, in surveillance, the tracking of aircraft within 3000 feet above the airport surface when TCAS is operated while the own aircraft is on the ground. There were no objections to this proposal and no concerns were expressed with such an implementation. The Co-Chairs agreed to caucus on how to handle proposing these change proposals to the PMC. The Co-Chairs will distribute the results of their discussions, along with their recommendations, to the Committee in the same time frame that the RWG report is distributed. Agenda Item 6 Consideration of Final Proposed Changes to SC-147 Terms of Reference There were no specific discussions conducted under this agenda item. Agenda Item 7 Other Business Agenda Item 7.a Traffic Situational Awareness with Alerts (TSAA) Status Dave Gray presented an overview of the of the SC-186 work to develop requirements and standards for TSAA. The Committee provided comments and feedback on the concept of TSAA and its operational use with the intent of ensuring that TSAA did not degrade the performance and safety provided by TCAS II. Agenda Item 8 Action Items There were no discussions under this agenda item. Agenda Item 9 Closing Session Agenda Item 9.a. Date and Time of Next Meeting All presentations from this meeting are available on the RTCA/SC-147 website or from RTCA upon request. The next meeting of the Committee will be scheduled following the RTCA PMC meeting scheduled for December. The Co-Chairs will schedule this meeting once further guidance on the Committee’s proposals and recommendations is received from the PMC. Certified as a true and accurate summary of the meeting. Co-Chairmen -S- -S- Mr. Robert Buley Mr. Stuart Searight Aircraft Data Fusion FAA 5
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October 6, 2011 - RTCA

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