NTSB Identification: FTW82FPG11
14 CFR Part 91: General Aviation
Accident occurred Saturday, May 08, 1982 in AMAGON, AR
Probable Cause Approval Date: 05/08/1983
Aircraft: MOORE BELL 47D1, registration: N45867
Injuries: 1 Fatal.

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 PURPOSE OF THE FLIGHT WAS TO TEST THE AERIAL SPRAY EQUIPMENT. AFTER STARTING AND WARMING THE ENGINE, THE PILOT TOOK OFF, FLEW ABOUT 1/4 MI SOUTH, THEN FLEW NORTH. A MOTORIST STATED THAT HE SAW BLACK SMOKE COMING FROM THE HELICOPTER. TWO TEEN-AGERS HEARD POPPING SOUNDS, AND REPORTEDLY, THE ENGINE WAS BACKFIRING, STOPPIN AND STARTING. ABOUT 1 MI NORTH OF THE DEPARTURE POINT, THE HELICOPTER IMPACTED AND TRAVELED 82 FT BEFORE STOPPING. AN INVESTIGATION REVEALED THE ENGINE HAD OPERATED ABOUT 17 HRS SINCE A MAJOR OVERHAUL ON 5/20/78. THE LAST REPORTED INSPECTION WAS ON 3/24/82. AN ENGINE TEARDOWN REVEALED HEAVY RUST AND CORROSION IN THE CARBURETOR, EXTREMELY DIRTY AIR CLEANER, OLD AND SEVERELY WORN SPANK PLUGS, MODERATE RUST AND CORROSION IN THE CYLINDER BARRELS, HEAVY DEPOSITS ON THE PISTON HEADS, AND MODERATE SCORING OF THE PISTON SKIRTS. ACCORDING TO THE PILOT'S PARENTS, THE ENGINE WOULD "POP" WHEN IT WAS FIRST STARTED AND THE PILOT HAD THE IDLE SET FASTER THAN NORMAL TO KEEP IT FROM RUNNING ROUGH.

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

MAINTENANCE,INSPECTION..INADEQUATE

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

OPERATION WITH KNOWN DEFICIENCIES IN EQUIPMENT..INITIATED..PILOT IN COMMAND


Contributing Factors

FUEL SYSTEM,CARBURETOR..CORRODED


Contributing Factors

FUEL SYSTEM,RAM AIR/INDUCTION AIR..BLOCKED(PARTIAL)


Contributing Factors

ENGINE ASSEMBLY,CYLINDER..CORRODED


Contributing Factors

IGNITION SYSTEM,SPARK PLUG..WORN


Contributing Factors

ENGINE ASSEMBLY,PISTON..OTHER

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