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this is time lapse photography of a

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dangerous weather condition called wind

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shear usually accompanied by intense

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downdrafts and heavy rain

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in recent years it has been linked to

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several aircraft disasters

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nasa has been investigating these

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hazards in hopes of understanding their

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effect on aircraft performance so that

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devised we're encountering a little bit

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altitude 400 feet okay we have wind

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shear warning a joint wind shear

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research program between nasa and the

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faa is concentrating on building

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avoidance procedures through pilot

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education with the use of simulators

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this is a computer model of wind shear

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notice the effect of the downdraft

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when a plane flies into this the winds

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can force it down

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nasa researcher dave hinton feels that

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simulator training is the key to

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teaching pilots how to deal with the

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problem

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for example this past summer july 11

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1988

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four aircraft encountered a microburst

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at denver staplan airport

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that was every bit as strong as the

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microburst that caused the crash at

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dallas fort worth in 1985. yet these

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four aircraft survived that encounter

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because of the training they'd received

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because of the training that the crews

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had received because of early

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recognition of the threat and early

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initiation of go around maneuver and

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proper escape maneuver also at langley a

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heavy rain simulator has been devised by

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a group of aerospace technologists

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at one end of the half-mile track is a

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tubular steel carriage designed

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originally to test tires and landing

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gear

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but specifically adapted to carry part

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of a full-scale aircraft wing section

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the wing is oriented to represent

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takeoff for landing settings used by

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commercial airliners

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water under extreme pressure launches

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the sled on a track at 150 miles per

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hour

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a field of over 1500 nozzles creates a

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windstorm for the wind

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in 10 seconds the test is over

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sensors on the wing measure its

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performance

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looking at the test again in slow motion

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an area of water turbulence can be seen

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over the front part of the wind

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wind tunnel studies have estimated that

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this turbulence causes a performance

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loss of 15 to 20 percent depending upon

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rain intensity

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aerospace technologist gaudi bezos we

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are here doing a large scale test to see

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if it's real is a realistic

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effect at large scale

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nasa's research on the effect of

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dangerous weather conditions preparing