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It estimates changes in noise contour area for airports based on aircraft types and operation counts, using Day-Night Average Sound Level (DNL) and applying the nighttime 10-dBA penalty. The guide explains the method’s purpose, the 65 dBA screening objective, and its development from CAB’s noise screening criteria and FAA environmental impact assessment practice.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/area-equivalent-method-aem-version-2c-sp2-users-guide/669719/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/area-equivalent-method-aem-version-2c-sp2-users-guide/669719.png","ImageObject",300,407,{"name":92,"@type":93},"anakgang17","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-02","2026-11-01",true,{"@type":102,"interactionType":103,"userInteractionCount":8},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What does the Area Equivalent Method (AEM) do in airport noise assessments?","Question",{"text":112,"@type":113},"AEM provides a screening estimate of changes in airport noise contour area to help determine whether further analysis is required with AEDT.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How does AEM quantify noise levels using DNL?",{"text":117,"@type":113},"AEM uses the Day-Night Average Sound Level (DNL), which summarizes noise over a 24-hour period and includes a 10-dBA penalty for nighttime operations (10 PM to 7 AM).",{"name":119,"@type":110,"acceptedAnswer":120},"What hardware and software are required to use this AEM version?",{"text":121,"@type":113},"This version is designed for Microsoft Windows 7 PC and later, requiring Microsoft Excel 2010 or later; no formal installation is required.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},669719,1793563781,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":8,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":129,"read_time":144},962090883568,"https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd","AEM  \nArea Equivalent Method Version 2c SP2  \nUser's Guide  \nJanuary 2018  \nFederal Aviation Administration Office of Environment and Energy Washington, DC 20591  \n1. Introduction  \nThe Area Equivalent Method (AEM) is a screening procedure used to simplify the assessment step in determining the need for further analysis with the Aviation Environmental Design Tool (AEDT) as part of Environmental Assessments and Impact Statements (EA/EIS) and Federal Aviation Regulations (FAR) Part 150 studies. The AEM calculates changes in noise using the algorithms found in AEDT 2c SP2 .  \n1.1. Change in Noise Area  \nAEM is a mathematical procedure that provides an estimated change in noise contour area for an airport given the types of aircraft and the number of operations for each aircraft. The noise contour area is a measure of the size of the landmass enclosed within a level of noise as produced by a given set of aircraft operations.  \nThe noise contour metric is the Day-Night Average Sound Level (DNL) which provides a single quantitative rating of a noise level over a 24-hour period. This rating involves a 10-dBA penalty to aircraft operations during the nighttime (between 10 PM and 7 AM) to account for the increased annoyance in the community.  \nThe AEM produces noise contour areas (in square miles) for the DNL 65 dBA noise level and the purpose of AEM is to screen for significant impact within the 65 dBA contour area. The user may specify other contour levels to obtain supplemental information. The AEM is used to develop insight into the potential increase or decrease of noise resulting from a change in aircraft operations.  \nThis version of the model has been developed in a spreadsheet format using Microsoft Excel 2010 and is based upon AEDT 2c SP2 and its fixed-wing aircraft database covering 279 aircraft types.  \n1.2. Installation  \nAEM2cSp2 is designed for use on Microsoft Windows /7 PC and later operating systems under Microsoft Excel 2010 and later. There is no formal installation ; only a requirement that the user have a copy of Microsoft Excel 2010 or later on their machine.  \n2. Description  \n2.1. Background  \nAccording to FAA Order 1050.lF,“Policies and Procedures for Considering Environmental Impacts,” an assessment must be made to determine the noise impact of a proposed airport action. This assessment compares the present noise impact on the environment with that of the proposed change. If the noise impact is significant, DNL 1.5 dBA increase at noise sensitive areas, then the FAA requires an Environmental Impact Statement (EIS) . If the increase of noise impact on the community is not significant then the FAA prepares a Finding of No Significant Impact (FONSI), which briefly outlines the specifications ofthe change in airport operations for that particular airport.  \nThe aircraft noise analysis for an EIS is a detailed process that requires use of an airport noise computer model such as the AEDT (Reference 1) . AEDT can produce a DNL noise contour area based on flight track locations, operations (e.g., a specific mix of aircraft) and takeoff procedures and plots the contour relative to runway configuration. AEDT is a useful model for airport planners, airport operators, and local governments in assessing the noise impact to the community around an airport. AEDT offers the capability to analyze several operational controls beyond simply changing aircraft mix and number of operations. AEDTis the most appropriate tool for EISs and other federally funded airport environmental studies.  \nThe old Civil Aeronautics Board (CAB) developed the Noise Screening Methodology to decide whether the noise impact due to a change is significant. CAB promulgated this noise screening procedure in 14 CFR 312, Appendix I. It was commonly called the \"CAB Procedure. \" CAB established a decision criterion of 17% increase in cumulative noise contour area. A 17% increase in cumulative noise contour area translates into a one-decibel increase in the a","cbCaijZD7fcWkEYi","https://ap.wps.com/l/cbCaijZD7fcWkEYi","pdf",910519,18,"English","# 1. Introduction\n## 1.1. Change in Noise Area\n## 1.2. Installation\n# 2. Description\n## 2.1. Background","[{\"question\":\"What does the Area Equivalent Method (AEM) do in airport noise assessments?\",\"answer\":\"AEM provides a screening estimate of changes in airport noise contour area to help determine whether further analysis is required with AEDT.\"},{\"question\":\"How does AEM quantify noise levels using DNL?\",\"answer\":\"AEM uses the Day-Night Average Sound Level (DNL), which summarizes noise over a 24-hour period and includes a 10-dBA penalty for nighttime operations (10 PM to 7 AM).\"},{\"question\":\"What hardware and software are required to use this AEM version?\",\"answer\":\"This version is designed for Microsoft Windows 7 PC and later, requiring Microsoft Excel 2010 or later; no formal installation is required.\"}]","Area Equivalent Method (AEM) Version 2c SP2 - User's Guide | PDF",45]