NTSB Identification: CEN09LA341
14 CFR Part 91: General Aviation
Accident occurred Thursday, June 04, 2009 in Spicewood, TX
Probable Cause Approval Date: 05/06/2010
Aircraft: HUSTON CHARLES D PITTS S-12, registration: N922TP
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 airplane was on departure when the engine started sputtering and lost power. The pilot turned toward the runway and landed beside the runway in the dirt, substantially damaging the airplane. Postaccident examination revealed that the fuel flow sensor, which was located upstream of the fuel flow filter, was clogged with an unidentified substance and there was particulate matter in the fuel lines. The source of the substances could not be determined. The experimental airplane manufacturer installed the fuel flow sensor upstream of the fuel flow filter as depicted on a fuel flow schematic, provided for information only, by the airplane airframe kit manufacturer. The installation instructions for the fuel flow sensor indicated the fuel flow sensor should be installed downstream of a fuel filter.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: A total loss of engine power due to fuel starvation as a result of the presence of an unidentified contaminant in the fuel system which clogged the fuel flow sensor. Contributing to the accident was the manufacturer’s installation of the fuel flow sensor upstream of the fuel filter and the misleading fuel schematic published by the airplane kit manufacturer. Full narrative available
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