NTSB Identification: FTW01LA103.
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Accident occurred Sunday, April 22, 2001 in Bossier City, LA
Probable Cause Approval Date: 10/23/2001
Aircraft: Joe Underwood Lazer Z, registration: N363WB
Injuries: 1 Serious.

NTSB investigators may have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The homebuilt experimental airplane impacted terrain while performing a low pass during an air show demonstration flight. The pilot was flying wings level at 200 mph, approximately 10 feet AGL, down the "show" line on a heading of 150 degrees. Level flight was established for about 4 to 5 seconds when the aircraft was "suddenly and violently forced straight down until ground impact occured." After a "hard" bounce, the pilot immediately applied "up elevator" and "continued flying the aircraft." The pilot then shut the engine down and glided to a landing on an adjacent runway. The pilot did not experience any "mechanical problems with the aircraft" and it "remained flyable and controllable following the ground impact." The pilot stated that he believed that the accident was "attributable to a severe wind shear and downdraft coming from a large hangar" located about 300 feet to the southwest of where the aicraft impacted the ground. The pilot reported the winds to be from 190 to 210 degrees at 25 knots, gusting to 35 knots.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

the pilot's failure to maintain control during the low level maneuver. A contribiting factor was the windshear.

Full narrative available

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