NTSB Identification: FTW88FA125.
The docket is stored on NTSB microfiche number 40071.
Accident occurred Sunday, June 26, 1988 in ANSON, TX
Probable Cause Approval Date: 10/06/1989
Aircraft: PIPER PA-28-236, registration: N2889N
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 PLT ENCOUNTERED FORECAST TSTMS EN ROUTE. AT 1430 CDT, THE PLT HAD RPTD 2400 FT MSL, CLIMBING TO HIS CRUISE ALTITUDE AT 8000 FT. AT 1440, THE PLT REQUESTED, AND DEVIATION AROUND WEATHER WAS APPROVED. THE PLT DID NOT REPORT FURTHER DIFFICULTY, BUT LOSS OF CONTROL AND AN IN-FLIGHT BREAKUP OF THE ACFT OCCURRED SHORTLY THEREAFTER. WEATHER AND RADAR DATA INDICATE THAT THE AIRPLANE BROKE UP NEAR THE EDGE OF A LEVEL TWO THUNDERSTORM. HEAVY RAIN AND LIGHTNING WERE REPORTED BY LOCAL RESIDENTS. THE OUTBOARD END OF THE LEFT WING AND THE STABILATOR HAD SEPARATED IN-FLIGHT. THE LEFT WING FAILED IN POSITIVE OVERLOAD. ALTHOUGH THE RIGHT WING HAD NOT SEPARATED, IT ALSO REVEALED DAMAGE FM HIGH POSITIVE LOADING. THE STABILATOR FRACTURES INDICATED TORSIONAL OVERLOAD. BOTH PLTS HELD PVT PILOT CERTIFICATES AND WERE INSTRUMENT-RATED.

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

INADEQUATE WEATHER EVALUATION-PIC; FLIGHT INTO KNOWN ADVERSE WEATHER, INADVERTENT-PIC; DESIGN STRESS LIMITS EXCEEDED BY PIC; THUNDERSTORM

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