NTSB Identification: DEN89LA181.
The docket is stored on NTSB microfiche number 40212.
Accident occurred Friday, July 28, 1989 in CARTWRIGHT, ND
Probable Cause Approval Date: 08/22/1990
Aircraft: CALLAIR A-9, registration: N8246H
Injuries: 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 PILOT WAS SPRAYING THIOLUX ON A FIELD AND HAD JUST PULLED UP FROM SWATH RUN WHEN HE HEARD A LOUD BANG AND NOTED ENGINE RPM DECAY. GROUND WITNESSES ALSO HEARD THE BANG AND OBSERVED DARK SMOKE TRAILING FROM THE AIRCRAFT. THE PILOT MADE A FORCED LANDING IN AN ALFALFA FIELD. THE LANDING GEAR COLLAPSED, RESULTING IN SUBSTANTIAL DAMAGE. A SMALL CARBURETOR FIRE WAS ALSO EXTINGUISHED. THE ENGINE AND CARBURETOR WERE PARTIALLY DISASSEMBLED. EVIDENCE OF AN EXTREMELY RICH MIXTURE, BACKFIRE, AND CARBURETOR FIRE WAS FOUND. ALL THE SPARK PLUGS WERE BLACK. THE CARBURETOR WAS OVERHAULED IN 1987 BECAUSE THE ENGINE RAN ROUGH AND WOULD NOT DEVELOP FULL POWER, REGARDLESS OF MIXTURE CONTROL SETTING. THE CARBURETOR HAD ACCUMULATED 300 HOURS SINCE OVERHAUL.

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

A TOTAL LOSS OF POWER DUE TO AN IMPROPERLY ADJUSTED CARBURETOR WHICH RESULTED IN AN EXCESSIVE RICH FUEL-AIR MIXTURE. THIS REQUIRED A FORCED LANDING IN AN AREA WHERE NO SUITABLE TERRAIN EXISTED.

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