NTSB Identification: SEA83FA178.
The docket is stored on NTSB microfiche number 21271.
Accident occurred Sunday, August 14, 1983 in GRANITE FALLS, WA
Aircraft: CESSNA 150, registration: N4446U
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 ACFT COLLIDED WITH THE GROUND IN A VERTICAL NOSE DOWN ATTITUDE. THE ENGINE WAS IMBEDDED 4 FT INTO THE GROUND. ALL COMPONENTS OF THE ACFT WERE ACCOUNTED FOR IN THE IMMEDIATE AREA OF THE IMPACT. WITNESSES OBSERVED THE ACFT IN A LEFT TURN BEFORE FALLING INTO A LEFT SPIN FOR 3/4 TURN AND STRIKING THE GROUND IN A VERTICAL ATTITUDE. A BURST OF ENGINE POWER WAS HEARD PRIOR TO IMPACT. A LOCAL PILOT WHO HAD FLOWN WITH THE OPERATOR IN THE ACCIDENT ACFT 2 WEEKS PRIOR TO THEMISHAP NOTED THAT THE AIRSPEED WAS READING ABOUT 15 MPH HIGH WITH INCIPIENT STALL CHARACTERISTICS NOTED WHEN AIRSPEED READINGS AS HIGH AS 70 MPH. THE OWNER STATED HE WOULD HAVE THE INSTRUMENT RECALIBRATED. NO EVIDENCE OF THIS WORK BEING DONE WAS FOUND.

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

STALL/SPIN..UNCONTROLLED..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..OPEN FIELD


Contributing Factors

FLIGHT/NAV INSTRUMENTS,AIRSPEED INDICATOR..INCORRECT

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