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Interval Management Applications

Interval Management Applications

Interval Management uses ADS-B In capabilities to precisely manage spacing between aircraft. Interval Management is a component of the future Trajectory Based Operations (TBO) vision, where air traffic controllers may opt to provide IM clearances to flights to manage their spacing intervals relative to other aircraft.

The first phase, Ground-based Interval Management-Spacing (GIM-S), is enabled by automation at air traffic facilities and used as a tool by air traffic controllers for the cruise and arrival phases of flight.

ADS-B In Advanced Interval Management

The avionics will include cockpit displays which will show surrounding traffic for situational awareness and provide speed guidance to help flight crews achieve and maintain an interval from a target aircraft, and can be used in en route or terminal airspace.


Interval Management using ADS-B In capabilities to precisely space groups of aircraft.

  • Consistent, low-variance spacing between aircraft leading to increases in arrival throughput
  • Maintaining efficient flight paths during high-density traffic periods.
  • Reduced fuel burn, noise, and emissions.
  • Decreased system delays.


GIM-S began initial operations at the Albuquerque Air Route Traffic Control Center in 2014 and is being deployed to additional centers in the NAS.

Advanced Interval Management will begin initial operating capabilities after 2025. The Minimum Operational Performance Standards for the avionics are being developed in RTCA. In 2017, the FAA provided support to NASA���s Air Traffic Management (ATM) Technology Demonstration-1 (ATD-1) flight test to evaluate prototype avionics and procedures.

How it works

GIM-S provides controllers with a set of capabilities (coupled scheduling, speed advisories, and extended metering) to enhance time-based metering operations in the cruise and arrival phases of flight in en route airspace. As an arrival management tool, GIM-S helps controllers increase efficiency in delivering aircraft to arrival metering points. It also provides more opportunities for fuel-saving Performance-based Navigation procedures.

Advanced Interval Management consists of a set of ground and flight-deck capabilities and procedures that are used in combination by air traffic controllers and flight crews to more efficiently and precisely manage spacing between aircraft in a stream of traffic. During an Advanced Interval Management operation, the controller will share an objective with the flight crew (to achieve and maintain a spacing goal relative to a target aircraft), and the flight crew will use the avionics to execute the spacing objective.

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