NTSB Identification: CEN09CA354
14 CFR Part 91: General Aviation
Accident occurred Friday, June 12, 2009 in Mitchell, IN
Probable Cause Approval Date: 11/09/2009
Aircraft: THROCKMORTON MATTHEW E F1-EVO, registration: N540MT
Injuries: 1 Serious,1 Minor.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

The pilot reported that during cruise flight he observed an oil pressure warning indication on the electronic flight instrument system and noted that the engine oil pressure had dropped to approximately one pound per square inch. He immediately turned toward the nearest airport, which was about 7 miles away; however, the engine stopped producing power about one minute later. The pilot prepared for a forced landing to a farm field. The field consisted of chest-high grass with soft, muddy areas. The airplane subsequently nosed over during the landing. A postaccident examination of the airplane revealed that an oil line between the oil cooler and the engine became disconnected. The oil line and fitting appeared to be otherwise intact. The examination also noted oil residue along the bottom of the fuselage. The oil line connection was not equipped with a clamp, and relied on the interference of the line and the fitting to maintain the connection. The pilot stated that the oil line manufacturer assured him that the design configuration was adequate.

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

A total loss of engine power due to the disconnection of an oil line and the subsequent loss of engine oil.

Full narrative available

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