Woodland, CA, USA
N9190U
Clyde K Carrier Team 1400Z
The airplane experienced a partial loss of engine power and collided with a ditch during a forced landing. About 800 feet above ground level (agl), the engine experienced a partial loss of engine power and was unable to sustain level flight. With a field below the airplane, the pilot initiated a sharp descent in an effort to make a forced landing. Upon touchdown, he stalled the airplane just before reaching an irrigation ditch. The wood reinforced plywood body of the airplane sustained damage upon impact. After the accident, the pilot conducted an examination of the airplane; he found no mechanical anomalies with the engine or airframe. He noted that prior to the accident flight he had installed new vented wing fuel caps, which were located in a negative pressure area of the wing. He opined that the low pressure area created a vacuum in the gravity fed fuel tank, restricting fuel flow to the engine, which resulted in a partial loss of power.
On November 27, 2002, at 1000 Pacific standard time, an experimental Clyde K. Carrier Team 1400Z, N9190U, experienced a partial loss of engine power while in cruise flight and collided with a ditch during a forced landing near Woodland, California. The student pilot/builder was operating the airplane under the provisions of 14 CFR Part 91. The pilot sustained serious injuries, and the airplane was substantially damaged. Visual meteorological conditions prevailed, and a flight plan had not been filed. The personal local flight originated at Watts-Woodland Airport, Woodland, California, about 0950, with a planned destination of Yolo County-Davis (Woodland) Winters Airport, Davis/Woodland/Winters, California. In a written statement the pilot reported that about halfway to his intended destination, about 800 feet above ground level (agl), the engine experienced a loss of power. With a field below the airplane, the pilot initiated a sharp decent in an effort to make a forced landing on the field. About midfield, with the airplane about 15 to 20 feet agl, he noticed an irrigation ditch in front of the airplane. Upon touchdown, he stalled the airplane just before reaching the ditch. The wood reinforced plywood body of the airplane failed upon impact. The National Transportation Safety Board conducted a telephone interview with the pilot about 2 years after the accident. The pilot stated that the engine was operating all the way to touchdown, but he was unable to sustain level flight. After the accident, he conducted an examination of the airplane; he found no mechanical anomalies with the engine or airframe. He noted that prior to the accident flight he had installed new vented wing fuel caps, which were located in a negative pressure area of the wing. He opined that the low pressure area created a vacuum in the gravity fed fuel tank, restricting fuel flow to the engine, which resulted in a partial loss of power.
the builder/pilot's improper modification of wing fuel caps resulting in the failure of the vent system to adequately compensate for the pressure differential between the fuel tank and the external low pressure area of the wing. This led to the partial loss of engine power in cruise flight due to fuel starvation, and a forced landing.
Source: NTSB Aviation Accident Database
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