Aircraft Noise Factors
Aircraft Noise Factors
- Personal Sensitivity: Aircraft noise exposure can extend miles beyond the limits of the Airport. Most impacts occur when aircraft are on their final approach to, or initial departure from the Airport. Since there is a wide range of sensitivity to noise, the perceived extent of noise annoyance for an individual is largely dependent on their personal reaction to it. In addition, an aircraft operating at night is generally perceived to be louder than it is during the day. Ambient noise lessens in the evening and a person’s sensitivity to noise is greater during sleeping/relaxation hours.
- Aircraft Factors: With advances in engine technology, newer jet aircraft are quieter than older ones. The Federal Aviation Administration (FAA) requires that civil aircraft comply with increasingly strict international standards of engine noise levels in order to fly within the National Airspace System. Generally, departures are louder than arrivals because aircraft need more engine power to attain a safe level of flight. Aircraft departing for distant destinations are also louder than those traveling to closer destinations because their rate of climb is hampered by their greater fuel load.
- Weather Factors: Weather has a strong influence on the choices of runways and flight paths used by aircraft, as aircraft take off and land into the wind for safety and performance reasons. The movement of noise through the air can also be influenced by wind, temperature, cloud cover, fog, topography, and man-made barriers such as homes and other buildings, which may result in varying noise levels at the same location at different times of the day. For example, changes in outside air temperature can influence how far noise travels as well as how quickly an aircraft climbs. Aircraft may also be directed to fly outside of normal arrival and departure routes to avoid thunderstorm activity and limited visibility may require aircraft to fly longer approaches.