NTSB Identification: CHI99LA297.
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Accident occurred Sunday, August 08, 1999 in OBERLIN, KS
Probable Cause Approval Date: 01/18/2001
Aircraft: Weatherly 201B, registration: N197SK
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 airplane impacted a muddy field following a loss of engine power during an aerial application. The Bendix NA-R9B carburetor fulcrum screw and the carburetor float pivot pin exhibited chatter marks. The fulcrum screw was removed after turning it 1/2 of a turn. The fulcrum screw safety wire was broken. The NA-R9B float carburetor technical overhaul manual states that the fulcrum screw is to be torqued to a value of 100-120 in-lbs.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: Engine failure due to an undertorqued carburetor fulcrum screw. Contributing factors were the muddy terrain and the low altitude of the aerial operation. Full narrative available
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