• Aviation Policy, Planning & Environment Topics
  • Aircraft Noise Issues
  • Aircraft Noise Levels
  • Airport Noise Compatibility Planning Toolkit
  • Airport and Airway Trust Fund (AATF)
  • Aviation Climate Change Research Initiative (ACCRI)
  • Emissions & Noise
  • Insurance Program
  • Key Officials
  • Models
    • Area Equivalent Method (AEM)
    • Emissions and Dispersion Modeling System (EDMS)
    • Heliport Noise Model (HNM)
    • Integrated Noise Model (INM)
    • Model for Assessing Global Exposure to the Noise of Transport Aircraft (MAGENTA)
    • Papers and Briefings on the Development Program for the Aviation Environmental Tool Suite
    • System for Assessing Aviation's Global Emissions (SAGE)
    • Tool Suite FAQs
  • Partnerships
  • Special Flight Authorization (Noise)
  • Supersonic Aircraft Noise

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The Heliport Noise Model (HNM) is a computer program intended to aide in the assessment of potential noise impacts of helicopter operations. Starting with the release of Version 7.0 of the Integrated Noise Model (INM), INM capabilities replace HNM for the evaluation of helicopter noise impacts.