NTSB Identification: ATL92LA110.
The docket is stored on NTSB microfiche number 47481.
Accident occurred Sunday, May 31, 1992 in WHITE HOUSE, TN
Probable Cause Approval Date: 07/29/1993
Aircraft: WICKS BOBCAT, registration: N9CK
Injuries: 1 Fatal.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PILOT/OWNER HAD COMPLETED THE ASSEMBLY OF HIS HOME BUILT AIRPLANE AND HAD CONFIRMED THAT THE AIRPLANE WAS AIRWORTHY, BEFORE TAXIING FOR TAKEOFF. A WITNESS AT THE SOD AIRSTRIP OBSERVED THE PILOT'S TAKEOFF AND CLIMB TO ABOUT 500 FEET. THE PILOT MADE SHALLOW TURNS AND RETURNED BACK OVER THE AIRSTRIP, AND WAS LAST SEEN FLYING IN A WINGS LEVEL ATTITUDE WEST OF THE AIRSTRIP. THE WITNESS REPORTED HEARING A CRACKING SOUND AND THEN SAW THE LEFT WING AND LEFT DOOR SEPARATE FROM THE AIRFRAME. THE AIRPLANE CRASHED IN AN ADJACENT FIELD ABOUT 300 YARDS FROM THE SOD AIRSTRIP. EXAMINATION OF THE AIRFRAME AND FRACTURES FAILED TO DISCLOSE A MATERIAL FAILURE. HOWEVER, ACCORDING TO THE BUILDING PLANS, THE SPAR TONGUE WHICH ATTACHES THE WING TO THE AIRFRAME, WAS NOT PROPERLY CONSTRUCTED WITH A PLYWOOD PLATE ON THE AFT SIDE OF THE TONGUE. THE EXAMINATION FURTHER CONFIRMED THAT THE WING FITTINGS AND BOLTS WERE SECURE. A REVIEW OF THE AIRFRAME MAINTENANCE LOG FAILED TO DISCLOSE A CURRENT PERIODIC INSPECTION. THE FEDERAL AVIATION ADMINISTRATION'S

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

THE PILOT/OWNER'S IMPROPER DESIGN CHANGE OF THE WING SPAR WHICH RESULTED IN THE OVERLOAD FAILURE OF THE LEFT WING. A FACTOR WAS THE PILOT/OWNER'S FAILURE TO PERFORM A PERIODIC INSPECTION.

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