STOL UC-1 Twin Bee # 020

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AIRCRAFT DATA

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According to a DPS report, Mark Haag, 68, of Richmond was flying the aircraft from Reklaw to the Cherokee County airport when he had to make an emergency landing in a pasture just west of FM 768.

Two of his passengers, Susan Inkley, 77, of Richmond and Bruce Finch, 84, of Houston, were injured. Inkley was airlifted to a Tyler hospital and is listed in good condition and Finch was taken to a Jacksonville hospital.

Haag and another passenger, Lisa Haag, 44, of Richmond, were not injured.

The pilot reported that he was flying the twin-engine airplane on a cross-country flight. During the climb to about 2,200 ft mean sea level, the right engine “quit.” The pilot performed the engine-out procedures checklist, and the right engine power was restored for about 2 minutes before the engine lost power again. The pilot was unable to restart the right engine and secured it. He then diverted toward the nearest airport, but the airplane would not maintain altitude, so he conducted a forced landing in hilly terrain short of the airport, during which the airframe sustained substantial damage. During examination of the wreckage, no debris was found in the fuel strainers. A review of the data recorded by the engine data monitor from the previous flight showed that, toward the end of the flight’s recorded data, the right engine’s cylinder head temperature and exhaust gas temperature (EGT) dropped, consistent with a reduction of power in the right engine. A review of the accident flight data showed that, about 8 minutes into the flight, the right engine’s EGT dropped from about 1,400 to about 375 degrees F for the next 30 seconds, increased to about 1,400 degrees F for the next 30 seconds, and then dropped again. The reason for the right engine’s power interruption could not be determined based on the review of the data. Subsequent examination of the fuel lines revealed no anomalies or debris. The right engine fuel servo was test run, and met the flow test bench specifications. Based on the available evidence, the right engine likely experienced a fuel flow interruption, which led to fuel starvation and a loss of engine power. The reason for the fuel flow interruption could not be determined. [NTSB ID No: CEN15LA038]