Pilot Debrief

Bell 47G-3B-2 near Lafetyette, IN — 2008-07-24

Final reportCHI08CA210
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Date
2008-07-24
Location
Lafetyette, IN, USA
Aircraft
Bell 47G-3B-2
Registration
N4029G
Category
Helicopter
Highest injury
None
Fatalities
0

Probable cause

The loss of engine power during an aerial application flight due to a fatigue fracture of the carburetor heat control valve spring and the inadequate maintenance inspection by the pilot/mechanic. An additional cause was the low altitude of the operation.

NTSB narrative

The helicopter began losing engine power during an aerial application run while maneuvering. The pilot attempted a landing in the field and the helicopter impacted terrain about 80 yards from an access road at the north edge of the field. The helicopter sustained substantial damage. The pilot was uninjured. Examination of the helicopter revealed that the carburetor heat control spring that keeps the carburetor closed was broken and its support rod had worn into the housing. The heat valve could only be opened about 1/3 and while corresponding cockpit control remained in the closed position. The fracture surface of the spring was consistent with fatigue. The spring had accumulated a total time in service of 832 hours. The pilot was a certificated aircraft mechanic who also performed maintenance on the helicopter. A National Transportation Safety Board Pilot/Operator Aircraft Accident/Incident Report was not received from the pilot.

NTSB coding

View NTSB final report

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