NTSB Identification: SEA90LA162.
The docket is stored on NTSB microfiche number 42694.
Accident occurred Saturday, August 11, 1990 in TUMWATER, WA
Probable Cause Approval Date: 11/10/1992
Aircraft: VADEN SA102 CAVALIER, registration: N70JV
Injuries: 1 Fatal.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

SHORTLY AFTER TAKE OFF, THE EXPERIMENTAL HOMEBUILT AIRPLANE WAS OBSERVED TO HAVE REACHED 150 FT AGL WHEN THE ENGINE BEGAN TO SPUTTER. THE ENGINE REGAINED FULL POWER MOMENTARILY; HOWEVER, WHEN THE AIRPLANE BEGAN A LEFT TURN, THE ENGINE SPUTTERED AND QUIT. THE AIRPLANE CONTINUED THE LEFT TURN WHICH INCREASED TO A SPIN. THE AIRPLANE THEN COLLIDED WITH THE TERRAIN IN A NOSE DOWN LEFT WING LOW ALTITUDE. DURING THE ENGINE EXAMINATION THERE WERE NO NOTED MECHANICAL FAILURES OR MALFUNCTIONS. AIRPLANE DOCUMENTATION SUGGESTS THAT BOTH AN ENGINE DRIVEN FUEL PUMP AND AN ELECTRICAL AUXILIARY FUEL PUMP BE INSTALLED. THE PILOT HAD INSTALLED ONLY AN ELECTRIC FUEL BOOST PUMP.

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

THE PILOT'S FAILURE TO MAINTAIN AIRSPEED DURING TAKEOFF FOLLOWING AN ENGINE LOSS OF POWER. THE REASON FOR THE LOSS OF POWER WAS NOT DETERMINED.

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