Noise Abatement Measures and Screening Criteria
Memo

 

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December 10, 1999

MEMORANDUM

TO: LFA/Bill Willkie, Project Manager

FROM: 150 Study Group/Dorn Crawford, for the Chair

SUBJECT: Noise Abatement Measures and Screening Criteria

The attached noise abatement measures are a consolidated listing of those adopted by the 150 Study Group at its December 7 meeting, including measures suggested in your October 15 presentation, and those put forward either as refinements or additions by the various committees based on their discussions in the interim. Also attached is a list of approved screening criteria, arrived at similarly.

The Study Group has striven to compile a listing of measures that aim to:

• reduce noise contours
• leverage technology
• make flight patterns more consistent, hence more predictable
• reduce exceptions to standard procedures
• keep information affecting airport operations accessible to the public
• respect operational needs and regulatory imperatives

Many, and indeed most, of the measures listed arose in multiple committee reports—an encouraging sign of common understanding, though not a necessary condition for incorporation here. In accordance with the Study Group's Charter, instead, the listing includes all those measures that found consensus in the Group at large.

Screening criteria should be taken in the context of implementing these aims. Measures listed, in turn, should be understood as elements for preliminary analysis, not as endorsed recommendations. Indeed, many are mutually exclusive alternatives, whose relative merits and demerits need to be laid out as explicitly as possible to support an informed choice. The addition of a modeling criterion for screening, for example, recognizes that noise reduction, like cost analysis, necessarily involves quantitative as well as qualitative assessment.

Both measures and criteria are listed in abbreviated, ‘bulletized’ form. Should any require elaboration beyond that provided at the Study Group meeting, please contact the Study Group chair, or me, without hesitation. We look forward to your consultation in moving this process forward.




NOISE ABATEMENT SCREENING CRITERIA, AS ADOPTED

Goals & objectives

    Study goals
    Study Group issues

Reduces noise exposure

    Minimize incompatibilities
    Assess using noise model

FAR Part 161

    Impact on interstate commerce
    Not discriminatory

Consistent with FAA objectives

    Aviation safety
    Airspace management

Feasible

    Cost analysis
    Monitorability





NOISE ABATEMENT MEASURES, AS ADOPTED

Runway Use Programs

    Alter preference for east runway

      Limit runway preference to daytime only
      Eliminate runway preference
      Reverse runway preference

    Raise tailwind threshold for reversing flow to 10 knots
    No exceptions to contraflow, unless emergency

Flight track changes

    Set uniform departure criteria for turning

      Altitude
      Distance
      Navigation markers
      Geographic features

    Make west runway divergence 15°, not 20
    Apply divergence to all NCP-directed departures on west runway

Approach procedures

    Route all arriving traffic into IFR approach corridor - no cancellations
    No VFR
    Noise-optimal STARs
    Higher holding and maneuver altitudes
    Steeper ILS glide slope approaches
    Two-stage approach procedures
    Delayed flap and gear extension approaches
    Reverse thrust restrictions/limitations

Departure procedures

    Noise-optimal SIDs
    Departure thrust cutbacks

      Close-in abatement procedures
      Distant abatement procedures

    Reduced thrust departure
    Begin all takeoffs at extreme end of runway

      Use prospective overrun extension for takeoffs

Advanced navigation technology

    Ground-based: markers, beacons, lasers, other
    Airborne: GPS/FMS (current vs milspec), microwave, other

Airport facilities

    "Hush houses"
    Counter-frequency generators
    Sound absorption media on or adjoining runways

      artificial (e.g. walls, runway treatments)
      natural (e.g. trees, other flora, earthen berms)

    Displaced thresholds
    High-speed exit taxiways
    Facility relocation

Airport use restrictions

    Conformance to NCP by all aircraft
    Prohibit aircraft not meeting Federal noise standards
    Capacity limitations (noise or operations)
    Partial or complete curfews
    Noise budget
    Operational quotas
    Fleet mix goals
    Limits based on event metrics: Lmax, SEL, TA, C-weighted DB, etc

Airport regulations

    Require NCP briefings for all ATCT personnel and pilots using SDF
    Other flight training restrictions
    Landing fees based on noise
    Engine run-up restrictions

Measures to enhance, monitor, or enforce noise abatement

    Show effect of full conformance to current NCP, compared to base case
    Establish airport noise office (already adopted by Study Group)
    Establish community noise forum (already adopted by Study Group)
    Maintain and expand Web site, public information centers

      Summary and complete NCP
      ATCT/pilot briefing
      Real-time information on runway conditions and use
      Scheduled activities affecting runway use (maintenance, training, etc)
      Current monitoring data

    Noise monitoring

      Continuous (fixed)
      Responsive to demand (mobile)

    Flight track monitoring: retain, process ARTS data
    Ongoing noise modeling




         

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