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    <title>Transport Research International Documentation (TRID)</title>
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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>A DESCRIPTION OF THE PHASE I AUTOMATED TERMINAL SERVICES CONCEPT</title>
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      <description><![CDATA[Research has been initiated to study the concept of Automated Terminal Services (ATS). Work is being done to: 1) define a Phase I baseline system for airports with operations rates near the threshold of eligibility for a manned control tower and 2) in Phase 2, to explore advanced hardware and control concepts (such as Discrete Address Beacon System data link). Potential roles for the Phase I system are: 1. Substitute for new control towers, 2. Additional safety at presently uncontrolled airports, 3. Shift reliever at manned control towers. This document describes the Phase 1 Automated Terminal Services concept in sufficient detail to let analysis, simulation, and flight test efforts proceed. The hardware and software configuration of the system is described along with specific services which generate automatic voice messages to the aircraft operating at an ATS airport. Examples of pilot interaction with the system are presented. (Author)]]></description>
      <pubDate>Wed, 13 Apr 1977 00:00:00 GMT</pubDate>
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