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Airport Noise Basics. Noise Analysis Overview. 2010 Hershey Conference. Chris Osburn, Env. Protection Specialist, WAS-ADO. March 3, 2010. Noise Quality issues. Why is noise important Brief overview of required noise analysis Common needs/supplemental needs What we are seeing

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Airport noise basics l.jpg

Airport Noise Basics

Noise Analysis Overview

2010 Hershey Conference

Chris Osburn, Env. Protection Specialist, WAS-ADO

March 3, 2010


Noise quality issues l.jpg

Noise Quality issues

  • Why is noise important

  • Brief overview of required noise analysis

  • Common needs/supplemental needs

  • What we are seeing

  • What we would like to see

  • Additional resources

  • What is new in noise

  • NextGen trends

    Note: This presentation relates to simple NEPA projects, such as Short Form EAs and EAs. Not those requiring significant Impact Analysis or NCP development


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Why is noise so important

  • It’s the law – Federal, State, and/or Local

  • Manage community expectations on noise issues

  • Noise has the potential to influence multiple additional areas of NEPA analysis


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Brief overview of required noise analyses

  • Remember what FAA Order 1050.1E says….(Paragraphs 14.6a and 14.6b), regarding triggering aircraft types and activity levels for analysis

    • But don’t forget the highly controversial caveat

  • Threshold of significance is an estimated noise increase of 1.5 dB at or above the DNL 65 dB

    • An increase from DNL 63.5 dB to DNL 65 dB is a significant impact

    • A 3.0 dB increase within the DNL 60 dB, is not necessarily a significant impact


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Common noise needs

  • In most cases an analysis using either the FAA Area Equivalent Method (AEM)* and/or Integrated Noise Model (INM), expressed in DNL, is all that is needed

  • A rationale no-build and/or alternative comparison cases, with same forecast of operations modeled for all cases

Note: AEM should not be used to illustrate a shrinking noise environment

Source: DCA RSA EA – Ricondo and Associates, 2010


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Supplemental metrics use

  • Supplemental Metrics can play a role in supporting the analysis, but are largely unnecessary for the majority of noise analysis

    • Maximum A-weighted Sound Levels - (Lmax)

    • Sound Exposure Level - (SEL)

    • Equivalent Sound Level - (Leq)

    • Time Above a Specified Sound Level - (TA)

    • Sound Pressure Level - (SPL)

  • Remember the FAA selects the appropriate supplemental analysis when necessary, therefore prior to utilizing supplemental metrics in any noise analysis FAA approval is required


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What we are seeing in recent documents

  • When to model noise and when noise analysis is not required

  • AEM, used to screen decreases in noise impacts where the forecast is falling

  • Inconsistent use of appropriate noise metrics

  • Inconsistent levels of analysis by consultants

  • Development of a practical comparison contour


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What the FAA would like to see

  • Simple and consistent analysis in the use of GIS and depiction of land use data in accordance with FHA Standard Land Use Coding Manual

  • Avoid saying to much or too little so as to prevent confusion of the audience, “Keep it Clear”

  • Follow Chapter 17 “Noise” in the Airports Desk Reference

  • Work with the FAA to determine additional analytical needs

  • Coordination with ATC for towered facilities on flight procedures and usage

  • Beware of apples and oranges comparisons when describing noise


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Additional resources to consider

  • FAA Order 1050.1E – Appendix A – Section 14

  • FAA Airports Desk Reference

  • FICON/FICAN Federal Agency Review of Selected Airport Noise Issues, 1992

  • FAA-AEE Website

  • TRB-ACRP Reports 15 and 16

  • NOISEQUEST

  • Your ADO

Hint… Hint…


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What is new in the World of Noise

  • INM 7.0b release – October 2009

    • Aircraft type and performance database changes

    • Corrections from 7.0a

  • FAA AC 150/5020 Update – 2010

    • Additional guidance on supplemental metrics use

    • Revised mitigation boundary guidance


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NextGen Trends on Noise

Publications are available via the FAA NextGen Integration Office, JPDO, FAA-AEE, and DOT-VOLPE, TRB-ACRP, PARTNER-COE, and NEXTOR

Popular Topics include:

  • Potential changes beyond the 65 DNL?

  • New Analysis Tools – AEDT

  • RNAV/RNP – OPD/CDA Procedures

  • NASA N+2 / FAA CLEEN Aircraft Technologies

Source: FAA-AEE


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It is all about…….

Google Images – arktimes.com

….or it could cost you time and money!


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