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126 Aircraft Noise: A Toolkit for Managing Community Expectations Public reaction: For those who live in the airport vicinity, run-ups may be irritating because they may be long lasting and the power settings may vary from high to low. When they occur at night they become even more intrusive because the ambient levels are typically lower and they may disrupt sleep. Any limitation on the presence, time, duration, power settings, or location of run-up activity that reduces their effects on residential populations is generally seen as positive by airport neighbors. Limit Taxiing Power Purpose: An airport may request the use of single engines or idle taxi power for taxiing to and from runway ends to reduce noise along taxiway routes. Limitations: Issues have been raised about overuse of one engine for taxi operations. At busy airports, air traffic controllers may object to the potential for additional conflicts between taxi- ing and landing or departing aircraft at taxiway/runway crossings. Implemented by: Aircraft operators/pilots, at the request of the Airport with concurrence by the FAA. Public reaction: Generally positive, but may not be noticeable beyond the immediate environs of the airport. Example of technique for public information: Ground Concept G-B (170) 8-7 Facility Development Actions Runway or Taxiway Addition or Relocation Purpose: While enhancement of capacity is the primary goal of additional runways and taxi- ways, an airport may take advantage of the process by assuring that the anticipated effects of that facility are minimized by its location and alignment. The availability of a new facility may lead to additional opportunities to use preferential runway use programs that rely on a more com- patible relationship between post-construction noise patterns and underlying land uses, or allow the focusing of traffic during the most sensitive periods onto the most compatible landing and departure routes. Taxiways near population concentrations may be constructed or relocated to more remote areas to abate sideline noise effects. Limitations: Runway projects are long-term solutions that must be fully assessed under NEPA and may require years of planning, design, and construction, all at high cost, prior to being com- missioned. It is critical that once a commitment is made to pursue the new runway solution, the land uses under the approach and departure paths to that runway must be dedicated to compatible use. Implemented by: Airport, with concurrence of the FAA. Review by users and the public through the NEPA process. Public reaction: Public reaction may be mixed. As with flight track modifications, the degree of public controversy will be dependent upon the severity of adverse impacts associated with the project's specific conditions. Displaced Threshold - Landings Purpose: A landing threshold may be located farther from the overflight end of the runway than the normal touchdown zone to seek noise abatement. This action may be implemented