NTSB Identification: SEA83FA118.
The docket is stored on NTSB microfiche number 21764.
Accident occurred Tuesday, June 07, 1983 in GOV'T CAMP, OR
Aircraft: PIPER PA28RT-201T, registration: N8402P
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.

WX CONDITIONS ALONG THE FLT ROUTE INDICATED CEILINGS OF 25,000 FT & UNRESTRICTED VISIBILITY EXCEPT FOR THE AREA SOUTH & WEST OF MOUNT HOOD. MOUNT HOOD, ELEVATION 11,239 FT MSL, ON THE SW SIDE OF GOVERNMENT CAMP & CLEAR LAKE (ACCIDENT SITE),WAS COVERED BY CLOUDS. ACCORDING TO WITNESSES, A CLASSIC TOWERING CUMULONIMBUS EXISTED OVER MOUNT HOOD. AT CLEAR LAKE, ABOUT 15 MI SOUTH OF MOUNT HOOD, IT WAS RAINING WITH HAIL & LIGHTNING, WITH A CEILING ESTIMATED AT ABOUT 300 FT WITNESSES AT CLEAR LAKE REPORTED THE STORM WAS IN PROGRESS FOR SOME TIME BEFORE THE ACFT 'FELL OUT OF THE CLOUDS' INTO THE LAKE. MOST OF THE RECOVERED WRECKAGE WAS FOUND IN CLEAR LAKE BY SCUBA DIVERS IN AN AREA 3600 FT BY 800 FT. WRECKAGE DISTRIBUTION INDICATED GENERAL DISINTEGRATION INFLIGHT PRIOR TO IMPACT.

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

IN-FLIGHT PLANNING/DECISION..IMPROPER..PILOT IN COMMAND

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:

OVERCONFIDENCE IN PERSONAL ABILITY..PILOT IN COMMAND


Contributing Factors

WING,SPAR..FAILURE,TOTAL


Contributing Factors

WEATHER CONDITION..TURBULENCE(THUNDERSTORMS)

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