NTSB Identification: SEA82FA015
14 CFR Part 91: General Aviation
Accident occurred Monday, January 04, 1982 in PLEASANT HILL, OR
Probable Cause Approval Date: 01/04/1983
Aircraft: PIPER PA-28-161, registration: N8265A
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 PLANE TOOKOFF AT 1505 PST ON A LOCAL VFR PLEASURE FLIGHT WITH 4 OCCUPANTS AND ABOUT 48 GALLONS OF FUEL ON BOARD. THE PLANE WAS ESTIMATED TO BE ABOUT 140 LBS OVER THE MAXIMUM GROSS WEIGHT LIMIT. AT ABOUT 1622 PST, IT WAS OBSERVED TO BREAK UP IN FLIGHT. SEVERAL WITNESSES REPORTED THE PLANE DIVING OUT OF A CLOUD. MOST REPORTED HEARING SOME TYPE OF EXPLOSIVE SOUND, AND MANY ALSO REPORTED HEARING A HIGH-PITCH WHINING/SCREAMING/REVVING SOUND JUST BEFORE OR AFTER BREAKUP. THE PLANE WAS ESTIMATED TO STILL BE ABOUT 63 LBS OVER THE MAXIMUM WEIGHT LIMIT WHEN IT BROKE UP. THE WRECKAGE WAS FOUND SCATTERED OVER AN AREA OF MORE THAN 1000 FT. THE HORIZONTAL STABILATORS AND VERTICAL STABILIZER HAD FAILED IN THEIR ROOT AREAS AND SEPARATED. THE RIGHT STABILATOR HAD A DOWNWARD SPANWIZE CAMBER. BOTH WINGS SEPARATED FROM THE FUSELAGE WITH THE OUTBOARD 4 FT ALSO SEPARATING. THE LEADING EDGES OF THE RIGHT AND LEFT INBOARD WING SECTIONS WERE DAMAGED AND MOLDED IN A MANNER THAT ONE CLOSELY MATCHED THE OTHER.

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

VFR FLIGHT INTO IMC..CONTINUED..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:

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


Contributing Factors

WEATHER CONDITION..CLOUDS


Contributing Factors

LACK OF TOTAL EXPERIENCE..PILOT IN COMMAND


Contributing Factors

AIRCRAFT WEIGHT AND BALANCE..IMPROPER..PILOT IN COMMAND


Contributing Factors

FLIGHT CONTROL,STABILATOR..OVERLOAD


Contributing Factors

FLIGHT CONTROL,STABILATOR..SEPARATION


Contributing Factors

WING..OVERLOAD


Contributing Factors

WING..SEPARATION

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