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Topic: Windshear

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	Making the Skies Safe from Windshear
		Windshear studies at Langley started in 1986 with analysis, moved to simulation and now are in the flight-test stage.
		Windshear is a generic term referring to any rapidly changing wind currents.
		Windshear poses the greatest danger to aircraft during takeoff and landing, when the plane is close to the ground and has little time or room to maneuver.
	oea.larc.nasa.gov /PAIS/Windshear.html (1054 words)

	windshear (Site not responding. Last check: 2007-10-09)
		One of those buzzwords that scare the crap out of people, windshear is a sudden change in the direction and/or velocity of the wind.
		Fortunately, windshear has become easier to forecast, and as a rule it does not appear out of nowhere, flipping a plane upside down without warning.
		Windshear got a lot of press in the 1970s and 1980s when it was still a misunderstood phenomenon.
	www.askthepilot.com /windshear.html (292 words)

	Plane crash in Taiwan occurs just months before Windshear Alert System is completed
		Windshear is a rapid change of wind speed or direction over a short distance.
		One form of windshear that is particularly dangerous to aircraft are microbursts, which are very short-lived, intense, downdrafts of air.
		Windshear is also associated with frontal systems that are the result of thunderstorms, where the front marks an abrupt transition in wind speed and direction.
	www.eurekalert.org /pub_releases/2000-11/AIoP-PciT-0111100.php (663 words)

	Windshear-Microburst display page (Site not responding. Last check: 2007-10-09)
		Windshear is any rapid change in wind direction or velocity.
		Severe windshear is a rapid change in wind direction or velocity causing airspeed changes greater than 15 knots(~17mph) or vertical speed changes greater than 500 feet per minute (around 5-6 mph in the vertical direction that is a lot).
		Identification of concentrated, more powerful downdrafts, known as Microbursts, has resulted from the investigation of windshear accidents and from meteorological research.
	www.math.unl.edu /~jfisher/NSF_96/windshear.html (670 words)

	Technology Transfer Program - At The Airport With NASA (Site not responding. Last check: 2007-10-09)
		Windshear has been blamed for over 30 aircraft accidents in the U.S., and the loss of hundreds of lives.
		After a bad windshear accident in 1985, the Federal Aviation Administration (FAA) and NASA began to work together to find a way to predict windshear, and to give pilots enough warning to take preventive action.
		Windshear is a sudden shift in wind direction and speed.
	techtran.msfc.nasa.gov /at_home/airport2.html (320 words)

	USATODAY.com - Travel - News - Tape: Northwest Airlines pilots dismissed weather warnings (Site not responding. Last check: 2007-10-09)
		Windshear is a rapid change in wind direction over a very short distance.
		Davidson said that according to his reports, the plane shifted drastically as its onboard windshear alert system sounded at an altitude of 800 to 1,000 feet as it approached the airport from the northwest.
		Northwest has trained pilots how to handle windshear, its meteorology office is good and the June 24 incident is "not consistent with how they generally operate," Mahoney said.
	www.usatoday.com /travel/news/2003/08/18-tornado-landing.htm (2439 words)

	Predictive windshear warning instrument - Patent 5059964
		An instrument (10) is disclosed for an aircraft having a windshear warning system to vary the threshold alarm setting as a function of a thermodynamic property of the air and as a function of local geographic and seasonal conditions.
		A windshear warning system that would not only provide adequate warning but also take in consideration special conditions at the airport of interest, including seasonal and geographic conditions would prove to be a significant contribution to the art and an important advance in flight safety.
		This invention is an improvement over conventional windshear warning systems inasmuch as it incorporates a better understanding of the meteorological phenomena associated with a windshear or microburst condition, thereby improving the margin against unwanted warnings and improving the time for the pilot to react.
	www.freepatentsonline.com /5059964.html (2689 words)

	Windshear and Turbulence Warning Service
		Alerts for possible low-level windshear and turbulence within 3 nautical miles of runway ends are automatically generated using data from a suite of weather sensors.
		The geographical distribution of windshear and turbulence is displayed on graphical displays for air traffic control supervisors and aviation forecasters.
		With improved windshear alerting techniques and facilities put in place in the last couple of years, the rate of successful detection of windshear events has been on the rise, accompanied by a steady decrease in the false alarm rate.
	www.weather.gov.hk /aviat/amt_e/windshear_warning_e.htm (411 words)

	TECHNOLOGY TODAY * Windshear (Site not responding. Last check: 2007-10-09)
		In just five years, NASA, the FAA and industry have moved advance-warning windshear devices from the drawing board to the commercial aviation marketplace.
		Windshear is a serious factor in air accidents, causing at least 500 deaths between 1964 and 1985.
		The new sensors provide up to 40 seconds warning of windshear, giving airline pilots enough time to avoid or safely fly through the hazard.
	nctn.hq.nasa.gov /innovation/Innovation21/TechToday02.html (121 words)

	Windshear guidance system - Patent 5361065 (Site not responding. Last check: 2007-10-09)
		Flight guidance in increasing performance windshear is based on the fact that the weather phenomenon of a microburst in the vicinity of the approach or departure area of an airport, where aircraft are operating at low altitude, may lead to hazardous conditions, and crashes have been documented as a direct result of this problem.
		According to the present invention, a windshear guidance system is provided to adjust the performance of the aircraft during the initial increasing performance windshear encounter such that the kinetic energy of the aircraft will be increased, and this increase in energy will help to prevent a crash during a subsequent decreasing performance windshear.
		In operation, a windshear detector (not shown) is utilized to determine that an increasing performance windshear is present, and when of a significant magnitude, the increasing performance windshear guidance is activated.
	www.freepatentsonline.com /5361065.html (3074 words)

	Comixfan Forums - Windshear
		Windshear is a mutant who possesses the ability to create solidified molecules air through the process known as transmogrification.
		Windshear can manipulate this "hard air" in a variety of ways, including projecting a stream of hard air molecules as concussive force blasts at a speed of up to approximately 60 miles per hour, to assist propulsion whilst flying, create defensive hard air shields, or entrap others in blocks of solid air.
		Windshear originally wore a suit of armor he received from Roxxon which affords him a certain level of physical protection as well as increasing his natural strength.
	www.comixfan.com /xfan/forums/showthread.php?t=10291 (917 words)

	FlyerTalk Forums - Windshear Warning (Site not responding. Last check: 2007-10-09)
		Windshear measurement equipment is on the ground, and available to the controllers in the tower.
		The Aural warining is Windshear twice followed by command bars indicating the path of travel to take as well as a visual warning (in yellow) on the EFIS of "Windshear".
		If there is Windshear in the vicinity of the airport, it is reported well in advance of landing or takeoff (landing is more critical) and it is ground based.
	www.flyertalk.com /forum/archive/index.php/t-292974 (944 words)

	Terminal Windshear
		Maximizing the utility of the AOAWS windshear components will be a function of how the system is ultimately used in an operational environment and this will be governed by its capabilities and performance.
		Onboard reactive windshear devices now provide windshear alerts to help pilots recognize that they have entered a windshear event, but they are reactive and do not provide an alert that can help pilots avoid windshear before they enter the event.
		This short duration is due to a combination of the true life cycle of the events coupled with the fact that they are usually moving with the precipitation cells.
	www.rap.ucar.edu /projects/taiwan/terminal.htm (450 words)

	[No title]
		Members of the Aeronautics Advisory Committee that oversees the research efforts of NASA called the windshear program "NASA at its best."[Ref 5-1] The windshear program was, indeed, a classic research success story, and its achievements were even more extraordinary because of the significant organizational and technical challenges the program involved.
		In truth, the technology for airborne windshear detectors and the level of knowledge about the phenomenon itself were still very limited, although researchers were working on the problem.
		Passive infrared radiometry was based on the premise that since microbursts were formed by a column of cooler, rapidly descending air, their presence would be marked by a sharp temperature shift in the air ahead of the airplane.
	oea.larc.nasa.gov /trailblazer/SP-4216/chapter5/ch5.html (9009 words)

	Plane survives taking off into windshear (Site not responding. Last check: 2007-10-09)
		The pilot was so shaken that he radioed back to controllers that it was "by the grace of God" that his McDonnell Douglas MD-80 did not crash, The Dallas Morning News reported in a copyright story Friday.
		The weather information was relayed from the radar room controller to a tower controller responsible for planes on the west side of DFW Airport, Murphy said, and the controller warned planes on his frequency about the windshear.
		A spokesman for the Allied Pilots Association said the union is outraged that the windshear alert was not passed on to all aircraft.
	www.chron.com /content/chronicle/aol-metropolitan/96/04/20/windshear.html (348 words)

	Nat' Academies Press, Aviation Weather Services: A Call For Federal Leadership and Action (1995) (Site not responding. Last check: 2007-10-09)
		The captain and first officer did not yet recognize that they had encountered severe windshear (i.e., a microburst) bemuse (1) the aircraft did not experience turbulence typical of windshear and (2) the aircraft's windshear warning system had not alarmed.
		The Charlotte tower supervisor's failure to properly advise and ensure that all controllers were aware of and reporting the reduction in visibility and runway visual range and the low level windshear alerts that had occurred in multiple quadrants.
		The inadequate software logic in the airplane's windshear warning system (which delays warnings when flaps are in motion) that did not provide an alert upon entry into the windshear.
	www.nap.edu /openbook/0309053803/html/7.html (1068 words)

	Windshear (Site not responding. Last check: 2007-10-09)
		Along with carpet drying, the Windshear was designed to handle clean up operations after fires, floods, or other water damage.
		Unlike other units, the Tornado Windshear employs a unique four point motor mounting system which reduces noise and vibration and adds to long life stability.
		The housing has been designed to allow for three angles of airflow positions at 0, 30 and 90 degrees and can be stacked on their side for easy storage.
	www.nmscinc.com /Windshear.html (171 words)

	Tornado Windshear Carpet Dryer - CleanFreak.com
		The Windshear is the answer for drying carpets, upholstery, or hard floors.This go-anywhere unit is a durable, rotationally molded dryer with sensible features and unmatched professional performance.
		The Windshear is perfect for use after fire, flood, or other water damage as well as for drying wet floors during rainy or snowy seasons.
		The Windshear is also appropriate for general air circulation in almost any facility.
	www.cleanfreak.com /Qstore/p001354.htm (267 words)

	NASA - The Hazard Index: Langley's 'F-factor'
		For the information provided by windshear sensors to be meaningful, a hazard index has been developed by NASA's Langley Research Center.
		Hazard criteria are based on Langley's analysis, flight tests, comparisons with windshear accident reconstructions and case studies of inadvertent encounters with severe windshear.
		As a result, hazardous windshear is considered to exist when the average F-factor exceeds 0.105 over a one-kilometer segment along an aircraft's flight path.
	www.nasa.gov /centers/langley/news/factsheets/F-Factor.html (324 words)

	[No title] (Site not responding. Last check: 2007-10-09)
		The agreement calls for the development of technology for airborne windshear detection and avoidance.
		The Doppler LIDAR system, to be flight-tested for the first time in Denver and Orlando, reflects energy from "aerosols" (tiny particles) moving inside a storm.
		Researchers are developing a system that automatically sends windshear data from ground radar to a display in an airplane cockpit.
	science.ksc.nasa.gov /shuttle/missions/status/r92-108 (419 words)

	Walrus Windshear XV convertible 4-season backpacking tent (Site not responding. Last check: 2007-10-09)
		The Walrus Windshear XV is a tough little tent.
		The Walrus Windshear features front and rear closeable mesh panels and 34 sq ft of living space.
		Condition: These Windshears have been used 1-4 times and are all in good condition.
	www.bce1.com /tents/windshearxv.html (384 words)

	Windshear @ Ontario, CA [www.orizzle.com] (Site not responding. Last check: 2007-10-09)
		Windshear @ Ontario, CA This UPS jet encountered windshear while attempting to land in Ontario.
		In the beginning of the clip, the increased pitch indicates the turbines are spinning-up.
		The plane then levels off, exhaust reappears as the turbines are spun-up for the go-around, and the plane is pitched up.
	orizzle.com /htm/v/032.htm (133 words)

	EGPWS Effectiveness (Site not responding. Last check: 2007-10-09)
		The introduction of on-board windshear detection along with pilot training and a standard uniform recovery procedure further helped to reduce the frequency of CFIT accidents.
		The incidence of windshear accidents has almost been eliminated in spite of the real world weather environment.
		Doppler radar across the USA on the ground and predictive windshear systems added to large aircraft has further reduced the windshear risk.
	www.egpws.com /general_information/description/effective.htm (354 words)

	Predictive Windshear Detection - PPRuNe Forums (Site not responding. Last check: 2007-10-09)
		NASA did quite a lot of work on windshear back in the mid 90s and there used to be some very interesting papers on their website.
		This target shift can be quantified on detection and since windshear will always result in movement (usually vertically but also sometime horizontally), the radar can now be used to detect it.
		windshear detection is a part of the egpws system and works in what is called mode 7.
	www.pprune.org /forums/showthread.php?p=2343229#post2343229 (882 words)

	Quay West Marine can save you £££s on a Bolle Windshear
		Based on the edge of Poole Harbour we are ideally placed for local purchasers and now with the growth of the Internet we now have Quay West Marine as an online store where you are able to buy Bolle Windshear from us from wherever you are in the UK and even the World.
		You will be able to see pictures of the Bolle Windshear together with full descriptions, finishes, colours, sizes, variants and specifications where appropriate.
		If you require more information about the Bolle Windshear or any other related products and parts and accessories click the Quay West Online logo below or here to be taken to the online shop where you will find more detailed specifications.
	www.quaywest-chandlers.co.uk /Products/product_pages/qwop_Bolle-Windshear_BolleWindshear.html (584 words)

	Windshear Crag (Site not responding. Last check: 2007-10-09)
		World of Warcraft Screenshots #18 Adventuring in Blizzard's Windshear Crag area, we see a forested habitat that is being stripped of its resources.
		Adventuring in Blizzard's Windshear Crag area, we see a forested habitat that is being stripped of its resources.
		The zone of Windshear Crag in Stonetalon Peak is among the hardest quests at level 17.
	www.worldrockclimbing.com /Climb/windshear-crag.html (241 words)

	Experts point finger at weather, windshear - World - theage.com.au
		Experts say the most likely cause of the Air France crash was bad weather and possibly what is known as windshear.
		The fact that the accident happened during a thunderstorm has raised speculation that it was caused by windshear, which is a sudden change in wind speed or direction.
		He praised the cabin crew, who are trained to evacuate a fully loaded plane within 90 seconds.
	www.theage.com.au /articles/2005/08/03/1122748700013.html (438 words)

	Hong Kong board dismisses CAL's windshear appeal-08/02/2005-Flight International (Site not responding. Last check: 2007-10-09)
		A Hong Kong accident review board has rejected claims by China Airlines (CAL) of Taiwan that windshear contributed to the August 1999 crash of a Boeing MD-11 at Hong Kong International airport, upholding the accident report's conclusion that an "extremely hard" landing due to errors by the captain was to blame.
		Its report says there was a strong wind from the north west and heavy rain, but the Automatic Terminal Information Service was warning pilots to expect "significant windshear and severe turbulence on the approach".
		An instrument landing system approach was carried out to runway 25L and after becoming visual with the runway at around 700ft, the commander disconnected the autopilot, but left the autothrottle system engaged.
	www.flightinternational.com /FALANDING_193591.htm (504 words)

	MEN'S OUTERWEAR FLEECE WINDPROOF - Cabela's T.E.F. 60 WindShear Jacket - Tall (Site not responding. Last check: 2007-10-09)
		And the 100% windproof, water-resistant, breathable WindShear laminate prevents chilly breezes from robbing your body of heat, increasing the garment's warmth-retaining ability even further.
		A pliable, 100% rip-stop nylon outer shell is inherently wind- and water-resistant and benefits from the weatherproofing bonus of an external DWR coating that sheds moisture.
		Cabela's proven WindShear laminate stops the cold, biting wind from penetrating while maintaining a high level of breathability and facilitating internal moisture exchange to keep you from overheating.
	www.ezvendor.com /cb/index1506.html (6996 words)

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