NTSB Identification: DEN85FTI02.
The docket is stored on NTSB microfiche number 27638.
Accident occurred Sunday, February 24, 1985 in FORT BENTON, MT
Aircraft: BENJAMIN PITTS S1U, registration: N155LB
Injuries: 1 Uninjured.

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 CONTACTED A DIRT BANK DURING A FORCED LANDING IN A FIELD FOLLOWING A LOSS OF PWR SHORTLY AFTER TAKEOFF. A LANDING WAS MADE AT FORT BENTON ARPT WHERE THE ACFT WAS SERVICED WITH 11.85 GALLONS OF 100 OCT AVGAS. POST ACCIDENT EXAMINATION OF THE ACFT REVEALED WATER CONTAMINATION IN THE CARBURETOR BOWL AND FUEL SYSTEM. A 1 QT JAR WAS FILLED WITH FUEL FROM THE FUEL LINE TO THE CARBURETOR. A 17/32 INCH LAYER OF AVGAS WAS PRESENT ON TOP OF WATER WHICH FILLED THE REMAINING PORTION OF THE JAR. THE ACFT WAS REFUELED FROM AN UNDERGROUND TANK. THERE WAS NO FILTERIZATION ELEMENT ON THE REFUELING EQUIPMENT.

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

FUEL SYSTEM..WATER

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

FLUID,FUEL..CONTAMINATION

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

REFUELING..INATTENTIVE..FBO PERSONNEL

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