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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>MINIMUM PERFORMANCE STANDARDS-AIRBORNE SELECTIVE CALLING EQUIPMENT</title>
      <link>https://trid.trb.org/View/84807</link>
      <description><![CDATA[Recommends standards and test procedures for Airborne Selective Calling Equipment for use with the ground-to-air selective calling system known as SELCAL.]]></description>
      <pubDate>Fri, 11 May 1979 00:00:00 GMT</pubDate>
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      <title>CONSULTATIVE PLANNING CONFERENCE ON AIRCRAFT SEPARATION ASSURANCE: PRESENTATIONS</title>
      <link>https://trid.trb.org/View/63144</link>
      <description><![CDATA[This document contains the vu-graphs presented at the Consultative Planning Conference of September 27, 1976 on the FAA's Aircraft Separation Assurance Program. The purpose of this conference was to inform and solicit comments from the aviation user groups on the FAA's proposed Aircraft Separation Assurance Program. The first section includes a review and analyses of pertinent statistical information on collisions and collision analyses, major separation assurance objectives, protection priorities, and methods of achieving objectives. The second section, Existing Air Traffic Control System, reviews the procedures and systems being used today related to aircraft separation. The third section, Developmental Approaches, contains information on conflict alert in the terminal environment, Collision Avoidance Systems (CAS) including Airborne CAS (ACAS) and Beacon-Based CAS (BCAS), Intermittent Positive Control (IPC) and Proximity Warning Indicator (PWI) systems. In Comparison of Overlapping Development Programs, the fourth section, information is given concerning FAA's selection of BCAS and IPC as the programs to pursue as well as FAA's decision not to proceed with ACAS and PWI. The final section, the recommended five-point Aircraft Separation Assurance Program, includes the plans, proposed schedules, interrelationships with other programs, cost and present status of (1) conflict alert in the terminal environment, (2) IFR flight Plan requirements (3) transponders and encoding altimeters, (4) BCAS, and (5) IPC.]]></description>
      <pubDate>Sun, 16 Jan 1977 00:00:00 GMT</pubDate>
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      <title>A DESCRIPTION OF THE INTERMITTENT POSITIVE CONTROL CONCEPT</title>
      <link>https://trid.trb.org/View/28925</link>
      <description><![CDATA[Intermittent Positive Control is a collision avoidance service provided to pilots by a totally automatic ground-based system. Collision avoidance is achieved by continuously providing pilots with advisory information on the location of nearby aircraft and by issuing avoidance commands on an 'as needed' basis. Intermittent Possitive Control provides protection both for pilots who are and for pilots who are not operating under the control of the Air Traffic Control System, while maintaining the freedom of action associated with uncontrolled flight. This document discusses the equipment necessary to provide IPC, the various services performed by the IPC system, and the processes by which the system determines its actions.]]></description>
      <pubDate>Mon, 18 Oct 1976 00:00:00 GMT</pubDate>
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      <title>INTEGRATED NATIONAL AIRSPACE COMMUNICATION SYSTEM (INACS) FOR THE SUPPORT OF AIR TRAFFIC CONTROL OPERATIONS IN THE 1980S AND 1990S. OPERATIONAL/MAINTENANCE REQUIREMENTS</title>
      <link>https://trid.trb.org/View/30193</link>
      <description><![CDATA[This document is intended to provide the operating/maintenance requirements/goals for future National Airspace System communications system designs and developmental efforts, and the vehicle for discussion and coordination with the various policy, planning, operating, maintenance, and engineering activities concerned with FAA Communications. Requirements submitted by Air Traffic and Airway Facilities Services have been used and augmented by inputs from SRDS, MITRE and the Computer Sciences Corporation. Communications requirements are established for all national airspace environments. This document provides the basic sets of requirements applicable to each of the environments and their subsets, i.e., voice/data air/ground communications, voice ground/ground communications and data ground/ground communications. These requirements will be utilized to derive the detailed functional and design requisites to be incorporated in all Integrated National Airspace Communication System (INACS) specifications.]]></description>
      <pubDate>Wed, 21 Jan 1976 00:00:00 GMT</pubDate>
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      <title>INTERMITTENT POSITIVE CONTROL COMPUTER ALGORITHMS FOR TEST BED EXPERIMENTS</title>
      <link>https://trid.trb.org/View/23816</link>
      <description><![CDATA[The document is to be used with the OSEM approved Intermittent Positive Control system description to initiate the programming of the IPC test bed systems. It applies to both the Discrete Address Beacon System Experimental Facility at MIT Lincoln Laboratories and the IPC Phase I experiments at NAFEC. Detailed flowcharts are provided and logical system interfaces discussed.]]></description>
      <pubDate>Tue, 10 Jun 1975 00:00:00 GMT</pubDate>
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