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United States Department of TransportationUnited States Department of Transportation

Integrated Noise Model (INM)

The Integrated Noise Model (INM) has been replaced by the Aviation Environmental Design Tool (AEDT) as of May 2015.

The INM was a computer model that evaluated aircraft noise impacts in the vicinity of airports. It was developed based on the algorithm and framework from the SAE AIR 1845 standard, which used noise-power-distance (NPD) data to estimate noise accounting for specific operation mode, thrust setting, and source-receiver geometry, acoustic directivity, and other environmental factors. The INM could output either noise contours for an area or noise level at pre-selected locations. The noise output could be exposure-based, maximum-level-based, or time-based.

What was INM designed to do?

In the United States, INM was the preferred model typically used for FAR Part 150 noise compatibility planning and for FAA Order 1050 environmental assessments and environmental impact statements. The INM had many analytical uses, such as:

  • Assessing current aircraft noise impacts around a given airport or heliport
  • Assessing changes in noise impact resulting from new or extended runways or runway configurations
  • Assessing changes in noise impact resulting from new traffic demand and fleet mix
  • Evaluating noise impacts from new operational procedures
  • Evaluating noise impacts from aircraft operations in and around national parks

For additional information on INM please contact Donald Scata, Office of Environment and Energy.

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