NTSB Identification: DEN83FA114.
The docket is stored on NTSB microfiche number 22378.
Accident occurred Monday, May 16, 1983 in BURNS, WY
Aircraft: PIPER PA-28R, registration: N33066
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.

BEFORE DEPARTING, THE PLT RECEIVED A WX BRIEFING & WAS ADVISED THAT VFR FLT WAS NOT RECOMMENDED THRU WESTERN NEBRASKA & EASTERN WYOMING. A FRONTAL WX SYS WAS FORCASTED TO PRODUCE THUNDERSTORM ACTIVITY WITH ASSOCIATED TURBULENCE & RAIN. REPORTEDLY, THE PLT WAS ANXIOUS TO MAKE THE FLT SO HE COULD DELIVER NEEDED PARTS FOR A MACHINE THAT WAS TO BE USED IN A PUBLICLY ADVERTISED DEMONSTRATION. ADDITIONALLY, HE FELT HE COULD HELP HIS PARTNER COMPLETE THE PROJECT IN TIME FOR THE DEMONSTRATION. THE PLT ELECTED TO FILE A VFR FLT & THEN DEPARTED AS PLANNED. WHILE EN ROUTE, THE ACFT ENCOUNTERED WX & SUBSEQUENTLY CRASHED. JUST BEFORE IMPACT, THE ACFT WAS SEEN SPIRALING AFTER IT CAME OUT OF A LOW OVERCAST WITH NO RIGHT WING OR TAIL SECTION. AFTER THE PLANE CRASHED, A WITNESS SAW THE RIGHT WING 'DRIFTING DOWN.' AN EXAM OF THE WRECKAGE REVEALED EVIDENCE THAT BOTH HORIZONTAL STABILATORS FAILED FROM POSITIVE AIRLOADS & THE RIGHT OUTBOARD WING SECTION FAILED FROM NEGATIVE AIRLOADS. NO EVIDENCE FOUND OF A MALFUNCTION/FAILURE BEFORE INFLT BREAKUP.

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

DESIGN STRESS LIMITS OF AIRCRAFT..EXCEEDED..PILOT IN COMMAND

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

SPATIAL DISORIENTATION..PILOT IN COMMAND

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

VFR FLIGHT INTO IMC..CONTINUED..PILOT IN COMMAND


Contributing Factors

LIGHT CONDITION..DUSK



Contributing Factors

FLIGHT CONTROL,STABILATOR..OVERLOAD


Contributing Factors

WEATHER CONDITION..LOW CEILING


Contributing Factors

WEATHER CONDITION..THUNDERSTORM


Contributing Factors

LACK OF TOTAL INSTRUMENT TIME..PILOT IN COMMAND


Contributing Factors

WING..OVERLOAD


Contributing Factors

WEATHER CONDITION..TURBULENCE


Contributing Factors

WEATHER CONDITION..RAIN


Contributing Factors

SELF-INDUCED PRESSURE..PILOT IN COMMAND

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