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Topic: Aircraft noise

	Noise
		Although internal noise was the major preoccupation of aircraft acoustic engineers for many years and still is important, the noise produced by the aircraft engine and experienced on the ground has become a dominant factor in the acceptability of the airplane.
		Noise maps typically depict the DNL 65dB contour as this is identified by federal guidelines as the threshold level of aviation and community noise that is "significant".
		Aircraft noise is generally divided into two sources: that due to the engines, and that associated with the airframe itself.
	adg.stanford.edu /aa241/noise/noise.html (2314 words)

	RDU Aircraft Noise Program
		The maps include contours that show aircraft noise exposure levels over an average annual 24-hour period, and the contours when all operations are in one direction for an entire day.
		Aircraft noise impacts are now equal to pre-hub 1987 levels.
		Aircraft noise is most apparent during jet takeoffs and landings.
	www.rduaircraftnoise.com /abatement/abatement.html (874 words)

	Aircraft noise - Wikipedia, the free encyclopedia
		Aircraft noise is defined as sound produced by any aircraft on run-up, taxiing, take off, over-flying or landing.
		Aircraft noise is a significant concern for approximately 100 square kilometers surrounding most major airports.
		The typical noise output of an APU is 113 decibels.
	en.wikipedia.org /wiki/Aircraft_noise (1513 words)

	Boycott Fedex! Read what other publications are saying about aircraft noise.
		Being subjected daily to the noise of aircraft flying overhead may be risk factor for high blood pressure, suggests research in the British Occupational and Environmental Medicine.
		Using environmental data on noise levels and air traffic statistics, the scientists compared the volunteers' blood pressure to the amounts of aircraft noise they were exposed to.
		Aircraft noise may increase the risk of high blood pressure and heart disease even among people who live miles from airports, according to a study out today.
	www.boycottfedex.com /airnoise.html (1211 words)

	NPC Library: Effects Of Aircraft Noise and Sonic Booms on Domestic Animals and Wildlife: A Literature Synthesis (Site not responding. Last check: 2007-10-31)
		The propagation of aircraft noise and sonic boom from source to receiver is a function of several factors, including relative distance; atmospheric attenuation due to wind, humidity, and temperature; and intervening noise barriers (e.g., large stands of trees and buildings).
		For subsonic noise, this decrease is inversely proportional to the square of the distance between the aircraft and the receiver (i.e., a decrease in acoustic intensity of approximately 6 dB for each doubling in relative distance).
		ORV noise (78-110 dB SPL) (Brattstrom and Bondello 1983)
	www.nonoise.org /library/animals/litsyn.htm (12964 words)

	Overview of Aircraft Noise (Site not responding. Last check: 2007-10-31)
		Most noise impacts occur when aircraft are on their final approach to or initial departure paths 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 his or her personal reaction to it.
		An aircraft arriving or departing at night is generally perceived to be louder than the same aircraft arriving or departing during the day (a person's sensitivity to noise is greater during sleeping hours)
	www.state.fl.us /goaa/noise/Overview.htm (289 words)

	It's Your Health - Aircraft Noise in the Vicinity of Airports
		Jet aircraft are one of the most disturbing sources of noise in our environment.
		When the children were exposed to aircraft noise, the levels of two stress hormones went up, but the level of the third did not.
		The blood pressure increase in the children exposed to aircraft noise was small when compared to normal blood pressure variations among children.
	www.hc-sc.gc.ca /iyh-vsv/environ/noise-bruit_e.html (945 words)

	Noise Complaints - Scottsdale Airport - COS
		Aircraft noise complaints from areas outside of the Scottsdale Airport influence area called in to the noise hotline will not become part of the official record of the City.
		Aircraft can legally fly at altitudes that some residents find annoying or believe to be unsafe, however, only the FAA has regulatory authority over aircraft in flight.
		When submitting aircraft noise complaints to the airport or low-flying aircraft complaints to the FAA, it is important to identify the offending aircraft as accurately as possible.
	www.scottsdaleaz.gov /Airport/NoiseSub_NoiseComplaints.asp (1003 words)

	BBC NEWS \| Health \| Aircraft noise 'affects learning'
		Exposure to aircraft noise was associated with impaired reading comprehension, even after factors such as socio-economic differences between schools were taken into account.
		Increased levels of exposure to both aircraft and traffic noise was associated with additional stress in children and a reduced quality of life.
		He said the results were relevant to the design and placement of schools in relation to airports and to the formulation of policy on noise and child health as well as the wider consideration of the effect of environmental factors on children's development.
	news.bbc.co.uk /1/hi/health/4603189.stm (646 words)

	Noise pollution - Wikipedia, the free encyclopedia
		The most significant impact of noise to animal life is the systematic reduction of usable habitat, which in the case of endangered species may be an important part of the path to extinction.
		Perhaps the most sensational damage caused by noise pollution is the death of certain species of beaked whales, brought on by the extremely loud (up to 200 decibels) sound of military sonar.
		Aircraft noise can be reduced to some extent by design of quieter jet engines, which activity was pursued vigorously in the 1970s and 1980s.
	en.wikipedia.org /wiki/Noise_(environmental) (1730 words)

	Aircraft Noise
		The noise an airplane makes depends on a number of factors, including the type of engines and type of aircraft, the weather and wind conditions, and whether the plane is landing or taking off.
		DNL is a cumulative measure of all of the noise events during a typical day, taking into account aircraft sound levels, number of flights, time of day and flight paths.
		The effect of aviation noise on sleep is a long recognized concern of those interested in addressing the effects of noise on people.
	www.ptipart150.com /AircraftNoise.htm (587 words)

	Aircraft Noise Pollution - MIT News Office
		Ian Waitz's group in aeronautics and astronautics has come up with an idea that could significantly reduce the noise from jet engines by injecting air from the trailing edges of the rotating blades within the engine.To aircraft manufacturers and operators, noise is a problem as serious as emissions.
		Noise from planes flying over residential areas impairs people's ability to work, learn in school and sleep, and consequently also results in lowered property values in affected areas.
		Waitz believes that the wake-management approach will prove more successful than "active control." Behind this competing technique is the fact that sounds of a given tone produce a unique sound wave pattern; when a sound with a wave pattern that is a mirror image of the undesirable sound is produced, the two cancel out.
	web.mit.edu /newsoffice/1995/noisepollution.html (677 words)

	Aircraft Noise
		Much exhaust noise is created by the sudden expansion of extremely hot gases into cold air, which is one reason why short stacks are louder than long tailpipes: the air has a chance to cool considerably inside the tailpipe.
		Another major component of exhaust noise, particularly when an airplane engine is bugling through tubular headers rather than an ordinary cast-iron automotive exhaust manifold, is the impact of the shock wave of every single exhaust pulse upon the thin stainless-steel pipe wall nearest the exhaust valve.
		Lord active noise control essentially removes the earcups and broadcasts the same signals from half a dozen or more speakers inside the aircraft cabin, and the effect is much the same, except that the entire cabin becomes the earcup.
	www.wolf-aviation.org /aircraft_noise.htm (4543 words)

	Aircraft Noise Regulations
		Aircraft operating in Australia must meet noise standards specified in the Air Navigation (Aircraft Noise) Regulations 1984 (the Regulations).
		Aircraft owners/operators intending to conduct adventure flights should obtain a copy of the guidelines issued by the Department.
		Some ex-military aircraft used by adventure flight operators do not meet current international noise standards and are required to be operated under a "Noise Permit" issued by the Department of Transport and regional services.
	www.dotars.gov.au /aviation/environmental/noise.aspx (591 words)

	WHO/Europe - Noise and health - Aircraft noise and health
		A WHO meeting on "aircraft noise and health review of existing evidence and needs for research" in October 2001 identified the areas where the input of WHO could be most useful to its Member States.
		Because aircraft noise is a specific type, how it affects human beings deserves separate exploration.
		Linear exposure-effect associations were found between chronic aircraft noise exposure and impairment of reading comprehension and recognition memory.
	www.euro.who.int /Noise/Activities/20021203_1 (228 words)

	About No Aircraft Noise
		The No Aircraft Noise Party was formed as a political party in 1995 to fight the issue of noise from
		The third runway had just been opened and residents to the north and south of the airport were exposed to intolerable noise up to seventeen hours a day.
		Membership of No Aircraft Noise is open to anyone who is not a member of another political party.
	www.noaircraftnoise.org.au /AboutNAN.html (227 words)

	Aircraft Noise (Site not responding. Last check: 2007-10-31)
		The contract stipulated that the surveyor was to advise "whether the property might be affected by aircraft noise." The court decided that the property owner was not entitled to a monetary award because the noise was an annoyance, rather than something that caused physical damage or distress.
		Noise measurements were based on ground testing of a pre-production model of the F-22 Raptor, and as such, do not necessarily indicate the noise levels of a jet in flight.
		Noise complaints have decreased to 30 percent of their levels since 1997 when the program was begun.
	www.nonoise.org /news/air.htm (17558 words)

	AIRCRAFT NOISE REDUCTION (Site not responding. Last check: 2007-10-31)
		Ian Waitz is the Director of the MIT Aero-Environmental Research Laboratory, where scientists are studying ways to reduce the noise of aircraft engines.
		"Airplane noise is something that's felt by more and more people, because more and more people live near airports, and airports are having more and more traffic, so there's more and more overflights.
		Aircraft noise is caused by unsteady air flow from the engine's fan.
	www.pulseplanet.com /archive/Nov96/1333.html (334 words)

	NASA - Cal Poly Students Help NASA Reduce Aircraft Noise
		The students were participating in the C-17 flight noise mitigation study, a NASA experiment that may one day make the world a quieter place.
		On Sept. 10, NASA demonstrated that aircraft capable of ESTOL could concentrate aircraft noise to a narrow area.
		The successful tests were made possible by the extraordinary efforts and ingenuity of the team to meet the challenges of a limited budget and a shortened test schedule, according to Craig Hange, NASA Ames project manager and principle investigator for the C 17 study.
	www.nasa.gov /vision/earth/improvingflight/c17noise.html (736 words)

	Aircraft noise
		It is not the policy of BAA ‘s Flight Evaluation unit to accept noise complaints via the Council, on an individual basis, but we would always investigate a particular trend involving a number of residents, and let you know the possible reason for a perceived change to normal operations.
		This is the reason that Stanwell residents suffer periods of continual taxiing noise occasionally all day sometimes during periods of good weather with positive easterly winds.
		There is, however, a system of quotas that regulates both the overall number of movements and a supplementary quota system depending on the loudness of individual aircraft aggregated to a total.
	www.spelthorne.gov.uk /com_health_aircraft_noise (882 words)

	Get involved - Aircraft noise
		Aircraft noise affects many thousands of local residents in Battersea, Wandsworth and Putney.
		Most aircraft still land into the prevailing westerly wind which means they make their descent over large parts of Clapham, Battersea, Wandsworth and Putney.
		Departing aircraft always use the southern runway and depart to the east.
	www.wandsworth.gov.uk /aviation (2041 words)

	Aircraft noise
		Thanks to technology, today's aircraft are 50% quieter than 10 years ago.
		Chapter 4 aircraft are at least one third quieter than those currently certified to the Chapter 3 standard.
		ICAO's Balanced Approach (pdf, 110kb) provides a transparent process for identifying a specific noise problem at an airport and then evaluating four types of measures to reduce noise, to see how the maximum environmental benefit can be achieved, most cost effectively.
	www.iata.org /whatwedo/environment/aircraft_noise.htm (267 words)

	CAAN - Citizens for the Abatement of Aircraft Noise (Site not responding. Last check: 2007-10-31)
		CAAN - Citizens for the Abatement of Aircraft Noise
		If you're a Washington D.C. metro resident who's tired of the all the airport and aircraft noise and air pollution, then you've come to the right place.
		Copyright 1997-2007 by Citizens for the Abatement of Aircraft Noise, Inc., a 501 (c) (3) non-profit organization.
	www.caan.org (79 words)

	RDU Aircraft Noise Program
		At RDU's request, air traffic controllers clear jet aircraft to 7,000 feet upon departure and keep inbound jet aircraft at a higher altitude of 8,000 feet until they cross over departing jet aircraft.
		The Raleigh-Durham Airport Authority adopted a Noise Abatement Policy that reduces aircraft noise and promotes compatible land uses.
		Throughout this website, you will find links to external websites that will provide you more information on aircraft noise and noise reduction efforts taking place across the country.
	rduaircraftnoise.com (152 words)

	Strobe lights, ultralight strobe lights, light sport aircraft wing tip strobe lights, aircraft positioning lights.
		Strobe lights make you and your ultralight or light sport aircraft visible to other pilots, especially during times of low visibility like early morning, late evening, or in overcast conditions.
		Do not focus on one area; look all around the aircraft and change the nose position of the aircraft to detect targets hidden by posts or other obstructions.
		Leave in-cockpit chores, such as programming GPS or folding maps, until you are clear of the circuit and keep totally focused on the area all around your aircraft, allowing yourself to be interrupted only by necessary radio calls and response.
	www.ultralightnews.ca /strobelights (863 words)

	Powered aircraft policy (Site not responding. Last check: 2007-10-31)
		Motor glider pilots are requested to not practice "touch and go's" at the airfield.
		All powered arrivals are strictly 'Prior Permission Required' and limited to approved aircraft/pilots, with the exception of specified local pilots, aircraft in emergency situations and emergency service and police helicopters.
		Approval is given by the CFI or his nominated deputy.
	www.talgarthgc.co.uk /powered.php (129 words)

	LADACAN - Luton and District Association for the Control of Aircraft Noise
		The Freedom Society is petitioning the Prime Minister to abandon expansion of onshore airports in the South East in favour of a new airport in the Thames Estuary where aircraft would not overfly people's homes.
		Pilots' trade union BALPA claims that Ryanair's threat to sack pilots who break safety rules undermines safety by stopping pilots' reporting their own errors and learning from their mistakes (Telegraph, Times).
		They cite noise impact, damage to quality of life, air pollution, water demand, poor road and rail access, climate change and inadequate economic benefits as reasons (Guardian, BBC, Times).
	www.ladacan.org (1598 words)

	Rotax manuals, Rotax aircraft engine manuals, Rotax engine maintenance schedule, Rotax engine advisories.
		Rotax manuals, Rotax aircraft engine manuals, Rotax engine maintenance schedule, Rotax engine advisories.
		Each issue is 25 to 35 minutes in length and is live on the web for 7 days.
		Rotax aircraft engine service, manuals, specifications and troubleshooting reports, for the Rotax 185, 277, 377, 447, 503, 532, 582 and 618 Rotax aircraft engines.
	www.ultralightnews.com /enginemaintenance (494 words)

	Aircraft Noise - Congressman Steve Rothman
		Ever since Congressman Rothman was elected to Congress, he has led the fight against aircraft noise at Teterboro, surrounding airports and throughout the nation.
		He was recognized by a leading anti-noise group, the National Association to Insure a Sound-Controlled Environment (NOISE), as its 2001 Legislator of the Year for his efforts.
		Aircraft Noise Reduction Act of 2001 - H.R. Bill Summary
	rothman.house.gov /issues_aircraft_noise.htm (885 words)

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