PRATTVILLE, AL, USA
N8146E
MOONEY M-20A
THE LEFT WING SEPARATED AS THE PLT BEGAN A PULL-UP AFTER A LOW PASS. THE SEPARATION POINT WAS IN THE WING ROOT WHERE THEMAIN SPAR HAD BEEN SECURED TO THE FUSELAGE WITH A METAL BRACKET. A BUTT SPLICE HAD BEEN MADE TO THE BOTTOM OF THE WING SPAR. THE FRACTURE AREA AT THE ROOT END OF THE MAIN WING SPAR WAS SOFT, DAMP & DISCOLORED COMPARED TO OTHER WOOD IN THE AREA. THE BUTT JOINT WAS LATER DETERMINED AS HAVING NO CAPABILITY FOR TRANSFERRING AXIAL STRESSES. THIS REPAIR WAS NOT DONE UNDER SUPERVISION OF A LICENSED MECHANIC. THE ACFT HAD OPERATED 40 HRS SINCE THE ANNUAL INSPECTION DATED 6/8/82. AD76-15-1 (INSPECTION OF THE WOOD WING) REQUIRES THAT THE WOOD WING BE INSPECTED IAW MOONEY SB M20-170A.
Source: NTSB Aviation Accident Database
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