NTSB Identification: ATL83FA091.
The docket is stored on NTSB microfiche number 21335.
Accident occurred Saturday, January 29, 1983 in PRATTVILLE, AL
Aircraft: MOONEY M-20A, registration: N8146E
Injuries: 4 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

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.

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

WING,SPAR..DETERIORATED

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

WING,SPAR..FAILURE,TOTAL

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

MAINTENANCE,MAJOR REPAIR..IMPROPER..OTHER PERSON



Contributing Factors

MAINTENANCE,ANNUAL INSPECTION..INADEQUATE..OTHER MAINTENANCE PERSONNEL

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