BRIDGEWATER, MA, USA
N51181
Cessna 150
Prior to the annual inspection, the airplane had not flown for approximately 3 years, and the fuel tanks were left half-full. During the annual inspection, the mechanic checked the main fuel strainer, and did not observe any contamination. After the inspection, the mechanic completely filled the fuel tanks, but the engine would not start. He then drained the tanks and refueled them; however, he did not recheck the main fuel strainer. The pilot-in-command stated that he sumped the fuel tanks during the preflight inspection, and found some water. He kept sumping the tanks until he could not see any water. About 20 minutes after departure, the engine lost all power, and the pilot-in-command performed a forced landing to a field. During the landing in high grass, the airplane struck a ditch and came to rest inverted. Examination of the wreckage by a Federal Aviation Administration inspector revealed that the fuel was contaminated with water and debris.
On August 9, 2000, about 1210 Eastern Daylight Time, a Cessna 150, N51181, was substantially damaged during a forced landing to a field near Bridgewater, Massachusetts. The pilot-in-command (PIC) and the pilot rated passenger were not injured. Visual meteorological conditions prevailed, and no flight plan was filed for the personal flight conducted under 14 CFR Part 91 During a telephone interview, the PIC stated that the pilot rated passenger was a mechanic who had completed an annual inspection on the accident airplane. The mechanic wanted to take the airplane for a test flight, but did not have a current medical certificate. Therefore, the mechanic asked the PIC to accompany him on the flight. While performing a preflight inspection of the airplane, the PIC "sumped" the fuel tanks and noticed water in the fuel. He kept "sumping" the tanks, until no water was present. Approximately 20 minutes after takeoff, about 3,000 feet, the engine lost all power. The PIC performed a forced landing to a field, and the airplane came to rest inverted in a ditch. During a telephone interview, the mechanic stated that prior to the annual inspection, the airplane had not flown for approximately 3 years. During those 3 years, the fuel tanks were approximately half full. The mechanic checked the main fuel strainer during the annual inspection, and did not observe any debris or contamination. About 2 weeks before the accident flight, the mechanic completely filled the tanks with fuel. After the fueling, the engine would not start. The mechanic drained all the fuel, and refueled the tanks to capacity, but he did not recheck the main fuel strainer. After the accident, he believed that there was water in the fuel tanks that was "stirred up" during those two fuelings. Examination of the wreckage by a Federal Aviation Administration inspector revealed substantial damage to the fuselage and empennage. The inspector observed fuel contamination in the main fuel strainer and carburetor.
The mechanic's inadequate annual inspection, which resulted in a departure with fuel contamination. A factor was the pilot-in-command's inadequate preflight inspection.
Source: NTSB Aviation Accident Database
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