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AfNoisefModelingfA _.___.___f <br /> 9.A. - Page 111 <br /> aircraft type during the evening and nighttime periods are required inputs to the INM. Due to the <br /> CNEL weighting scheme, evening and nighttime operations have a greater potential effect on the <br /> shape and size of the noise exposure area than their number might suggest. In the calculation of <br /> CNEL, one operation during the evening hours is equivalent to three daytime operations and one <br /> operation during the nighttime hours is equivalent to 10 daytime operations. <br /> Based on conversations with airport management and operations personnel it is assumed that 94% <br /> of the operations at San Carlos Airport in 2013 occurred during daytime hours,4%of the <br /> operations occurred during evening hours, and 1%of the operations occurred during nighttime <br /> hours. <br /> A.5.3â– RunwayaJsev <br /> Runway use for departures or arrivals is typically a function of prevailing wind and weather; <br /> lengths and widths of the runways;runway instrumentation; and effects of other airports or air <br /> traffic facilities in the area. Runway use may also be influenced by the direction of flight of an <br /> arriving or departing aircraft;the aircraft parking position; and/or periodic closures of runways <br /> and taxiways. Finally,noise abatement procedures may also influence runway use at an airport. <br /> Runway use information for existing conditions (2013)is presented in Tableoo-3.o <br /> TABLEv4-3v <br /> EXISTINGZONDITIONS'(2013)42UNWAYNUSEOYI.OPERATIONvTYPE,ISANuCARLOSAIRPORTv <br /> v OperationvTypev <br /> Runwayv Arrivalv Departurev Touch-and-Gov <br /> 12f 20%f 20%f 20%f <br /> 30f 80%f 80%f 80%f <br /> fSOURCEf Sanf Mateof CountyfPublicf WorksfAirportsf Division f Marchf2014 f <br /> A.5.4TlightvTrackmandhFlightvTrackiJsev <br /> Once aircraft leave a runway on departure or while approaching a runway on arrival,their <br /> location and altitude over surrounding communities becomes a determining factor in how much <br /> noise is experienced on the ground. For this reason,flight track information is an important input <br /> to the INM. Most pilots fly their aircraft in predictable patterns as they follow instructions from <br /> FAA Air Traffic Control handling their movements into or away from an airport. <br /> Flight tracks are defined to represent the typical paths of the large majority of aircraft located <br /> throughout the study area. When using NM,these flight tracks are specified to capture the <br /> complexity of the actual flight patterns by representing the center of a specific flow of traffic, and <br /> dispersed tracks linked to the center track to account for the width. <br /> SanfCarlosfAirportV A-7 ESAfAirportsf/130753f <br /> ALUCPfWhitefPape/ Junef2014f <br />