NTSB Identification: CHI90LA274.
The docket is stored on NTSB microfiche number 42784.
Accident occurred Wednesday, September 26, 1990 in WAUKESHA, WI
Probable Cause Approval Date: 11/09/1992
Aircraft: Burkhart Grob 109A, registration: N912G
Injuries: 1 Minor,1 Uninjured.

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

THE STUDENT PILOT REPORTED THAT HE WAS LANDING TO THE NORTH AT AN UNCONTROLLED AIRPORT WHEN THE LEFT WING OF THE MOTOR GLIDER AIRPLANE HE WAS FLYING STRUCK A TRACTOR TYPE LAWM MOWER. HE SAID THAT WHEN HE INITIALLY SAW THE MOWER IT WAS ABOUT 80 FEET FROM THE RUNWAY. THE NEXT TIME THAT HE SAW IT, IT WAS APPROXIMATELY 3 FEET FROM THE RUNWAY'S LEFT EDGE. THE OPERATOR OF THE MOWER SAID THAT HE WAS DRIVING THE MOWER ON THE WEST SIDE OF THE RUNWAY WITH HIS BACK TO THE APPROACHING AIRPLANE. HE DID NOT SEE OR HEAR THE AIRPLANE UNTIL IT HIT THE MOWER.

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

THE PILOT'S FAILURE TO MAINTAIN ADEQUATE CLEARANCE AND VISUAL LOOKOUT FOR THE MOVING TRACTOR.

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