NTSB Identification: SEA86FA231.
The docket is stored on NTSB microfiche number 32614.
Accident occurred Saturday, August 30, 1986 in PROSSER, WA
Aircraft: Ercoupe (Eng & Research Corp.) 415C, registration: N3002H
Injuries: 1 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 PLT WAS PRACTICING FLY-BYS FOR THE NEXT DAYS AIRSHOW. THE LEFT WING SUSTAINED AN INFLIGHT STRUCTURAL FAILURE. INVESTIGATION REVEALED A PROGRESSIVE CRACK IN THE #7 RIB EMANATING FROM PREVIOUS DAMAGE TO THE LEADING EDGE OF THE LEFT WING TIP. THIS RESULTED THE INFLIGHT STRUCTURAL OVERLOAD OF THE MAIN SPAR.

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

WING,WINGTIP..PREVIOUS DAMAGE

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

WING,WING RIB..CRACKED

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

MAINTENANCE,MAJOR REPAIR..INADEQUATE..OTHER MAINTENANCE PERSONNEL

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

WING,SPAR..OVERLOAD

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

WING..FAILURE,TOTAL

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