Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Agenda Item 4.b ASIAS/CAST/CAS Steering Committee<br />
There were no discussions under this agenda item.<br />
Agenda Item 5. Working Group Status Reports<br />
Agenda Item 5.a Requirements Working Group (RWG)<br />
Andy Zeitlin provided a summary of the RWG’s work since the last Plenary meeting. The main<br />
focus is preparing a report on future collision avoidance systems and work on that report has been<br />
completed. Andy’s report provided an overview of the contents and recommendations from the<br />
report. The report identifies both near-term and long-term improvements that could be<br />
incorporated into the collision avoidance logic.<br />
The contents of the report were reviewed this week by the RWG and the RWG is in agreement<br />
with the current version of the report. Following the completion of a few editorial cleanup<br />
changes, the report will be ready for distribution to the Committee for review and comment.<br />
To support the delivery of the report to the Program Management Committee (PMC) in<br />
December <strong>2011</strong>, the following distribution and review schedule was agreed to during the<br />
meeting.<br />
Initial Distribution <strong>October</strong> 19, <strong>2011</strong><br />
Comments Due Back to Andy November 7, <strong>2011</strong><br />
Telecon/Webex to Review Comments November 9, <strong>2011</strong><br />
Deliver to PMC November 30, <strong>2011</strong><br />
Agenda Item 5.b Surveillance Working Group (SWG)<br />
Ruy Brandao provided a status report on the SWG’s work. Since the last SC-147 meeting, work<br />
has continued to develop and evaluate means of reducing the TCAS utilization of the 1090 MHz<br />
frequency. A simulation model that was previously developed was updated to incorporate all six<br />
specific change proposals and testing was done with all of the various proposals. Simulations<br />
show that Changes to DO-300 would result in 1090 MHz utilization reduction of 60% to 85%<br />
when all simulated TCAS II equipped aircraft have these changes implemented. Additional<br />
change proposals have been defined which would further reduce the contributions of on-ground<br />
TCAS to 1090 MHz utilization. Evaluation of the benefits of these changes is expected to be<br />
complete by the end of the year. Safety studies do not show any degradation in risk ratio when<br />
these changes are implemented.<br />
The SWG recommended that the Terms of Reference be amended to allow incorporation of these<br />
changes in the MOPS. The SWG will continue work on the change proposals under the<br />
assumption that the Terms of Reference will be updated. This may result in changes to DO-<br />
185B, DO-300, or both.<br />
The SWG also proposed allowing TAs to be issued based solely on ADS B data (for hybrid<br />
surveillance equipped aircraft) if the intruder was not already being interrogated and then<br />
switching to active interrogations immediately after the TA was issued. The Committee agreed<br />
with this proposal.<br />
4