NTSB Identification: CEN12LA514
14 CFR Part 137: Agricultural
Accident occurred Friday, August 03, 2012 in Holcomb, KS
Probable Cause Approval Date: 01/13/2014
Aircraft: WEATHERLY AVIATION CO INC 620B, registration: N2008S
Injuries: 1 Minor.
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 pilot noted that the engine rpm during the takeoff was about 30 rpm lower than normal but was still within the normal operating range. He reported that the airplane's engine then lost partial power as it climbed through about 50 feet above ground level after takeoff. After the airplane lost power, the pilot attempted to drop the chemical load to remain airborne; however, the airplane impacted an open field about 1 mile from the departure airstrip. Subsequent examinations of the airplane’s engine and its systems did not reveal any anomalies that would explain the loss of engine power. The weather conditions at the time of the accident were conducive to carburetor icing at glide and cruise power and were within the range of susceptibility for serious icing at glide power. Glide power settings yield a throttle angle similar to low power settings used for taxi operations; therefore, it is likely that the airplane’s carburetor accumulated ice after engine run-up and during taxi, which was not detected by the pilot. The pilot did not mention using carburetor heat during the pretakeoff engine run-up or during the power loss event; thus, based on the available information, it is likely that the airplane's engine lost power due to carburetor icing.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The pilot's failure to use carburetor heat while operating in conditions conducive to carburetor icing, which resulted in a partial loss of engine power shortly after takeoff. Full narrative available
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