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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Research in Progress (RIP)</title>
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      <title>Project 39 - CDA MITRE MFAST Tool IE Review</title>
      <link>https://rip.trb.org/View/1364647</link>
      <description><![CDATA[Continuous Descent Arrival, also called Continuous Decent Approach (CDA), is a procedure where aircraft descend directly from a relatively high altitude without the traditional leveling off in a series of steps. Currently, CDA is implemented in conjunction with Area Navigation Standard Arrival Route (RNAV STAR) development and requires analysis and guidance for the development of the approach's vertical profile. The FAA RNAV office has requested an additional module to its Terminal Area Route Generation Evaluation and Traffic Simulation program, a requirement for RNAV procedure development. This additional module would be a procedure design tool for incorporating vertical profiles which include CDA criteria for altitude and speeds. The MITRE Corp. has proposed the development of an flight management simulation tool (MFAST) module to support the FAA RNAV office request. The FAA AEE would like to ensure that the module produces the desired criteria for the RNAV STAR vertical profiles. Project 39 will evaluate MFAST by using output from its Tool for Analysis of Separation and Throughput.]]></description>
      <pubDate>Tue, 11 Aug 2015 01:00:28 GMT</pubDate>
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      <title>Project 04 - CDA</title>
      <link>https://rip.trb.org/View/1364646</link>
      <description><![CDATA[Continuous Descent Arrival (CDA), also referred to as the Continuous Descent Approach, has proven, through both simulation and flight demonstration tests, to be highly advantageous over conventional arrival and approach procedures that require combinations of level flight segments and descents ("dive-and-drive"). These advantages provide ample motivation for research efforts to further develop CDA for implementation in low-density through high-density traffic. CDA's environmental and economic benefits were demonstrated by PARTNER researchers in flight tests at Louisville International Airport in 2002 and 2004, and Atlanta Hartsfield-Jackson Airport in 2007. Successful implementation was also achieved at Los Angeles International Airport in 2007 and Atlanta in 2009. From the environmental perspective, there are significant reductions in noise along portions of the flight path (due to reductions in thrust and a higher average altitude) and emissions (due to reductions in thrust). From the economic viewpoint, there are significant fuel and flight time savings (due to reductions in thrust and a higher average speed) as well as the potential to meet or exceed current runway throughput without the need to vector aircraft. Future work will include a module integrated with the existing FAA TARGETS analysis program to facilitate CDA future development; in addition, to enable CDA implementation in a more dense traffic situation, a metering tool is being developed for the aircraft merging and spacing required.]]></description>
      <pubDate>Tue, 11 Aug 2015 01:00:27 GMT</pubDate>
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      <title>Project 32 - End-Around Taxiway (EAT) Optimization</title>
      <link>https://rip.trb.org/View/1364635</link>
      <description><![CDATA[Concerns about the aviation's environmental impact have prompted research efforts around the world. Much of this research has focused on changes to future aircraft and engine designs: although these hold the prospect of significant environmental impact reductions on a per flight basis, it will take a long time for them to be developed and propagate through the operational fleet in sufficient numbers to have a significant impact on overall emission levels. Until then, strategies that reduce the environmental impacts of existing aircraft are needed. Therefore, there is a need to identify and evaluate ways to reduce the environmental impacts of aviation in the near term. Such changes would involve minor adjustments to operating procedures or limited equipment/infrastructure changes. Several potential approaches have been suggested and investigated in various depths. For example, Continuous Descent Approaches (PARTNER Project 4) have been investigated extensively through field trials and show notable environmental impact reduction. In contrast, work on advanced surface movement optimization (PARTNER Project 21) is still largely in the research stage, while other possible changes have yet to be fully defined, let alone studied in any significant depth. Project 32 will systematically evaluate and rank all the potential near-term operational changes against a common set of environmental impact and feasibility criteria, and hence make it possible to determine the relative potential of the various options and to understand which ones should be given priority.]]></description>
      <pubDate>Tue, 11 Aug 2015 01:00:08 GMT</pubDate>
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