NTSB Identification: DEN83LA132.
The docket is stored on NTSB microfiche number 21747.
Accident occurred Wednesday, June 01, 1983 in DEVILS TOWER, WY
Aircraft: BELL 47G3-B1, registration: N80711
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 ACFT CRASH LANDED IN TREES AFTER THE ENGINE LOST POWER. THE HELICOPTER WAS BEING USED IN AERIAL APPLICATION AT THE TIME OF THE ACCIDENT. THE OPERATION WAS BEING DONE IN 8 MINUTE SEGMENTS. EVERY 8 MINUTES THE HELICOPTER LANDED FOR A RELOAD OF HERBICIDE. AT ABOUT 1430-1500 HOURS THE ACFT WAS REFUELED WITH 29 GALLONS OF 100 OCTANE FUEL. AT 1600 HOURS THE ENGINE CEASED OPERATION 3 MINUTES AFTER A TAKEOFF. THE ACFT WAS AT 50 FT AGL GOING ABOUT 30 MPH. THERE WAS NO CLEAR AREA FOR A LANDING SO THE PILOT AUTOROTATED INTO TREES. THE ACFT HAS AN ENDURANCE OF ABOUT ONE AND ONE HALF HOURS. DURING THE FIRST INTERVIEW THE PILOT SAID THE ACFT RAN OUT OF FUEL. NO FUEL WAS ABOARD THE ACFT AFTER THE ACCIDENT. THE PILOT LATER FOUND AN AN FITTING WAS LOOSE ON THE GAS TANK SUMP DRAIN. HE SAID IT WAS NOT LEAKING WHEN THE ACFT WAS REFUELED. THE PILOT FOUND AN AREA OF LEAKED FUEL WHICH HE ESTIMATED AT 5 GALLONS NEAR THE SUMP DRAIN. THE ACFT HAS ONLY ONE FUEL TANK AND IT CONTAINS 2 UNUSABLE GALLONS OF FUEL.

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

FLUID,FUEL..EXHAUSTION

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

FUEL SUPPLY..INADEQUATE..PILOT IN COMMAND

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

REFUELING..NOT PERFORMED..PILOT IN COMMAND


Contributing Factors

AUTOROTATION..PERFORMED..PILOT IN COMMAND


Contributing Factors

OBJECT..TREE(S)


Contributing Factors

FUEL SYSTEM,DRAIN..LOOSE

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