NTSB Identification: DFW07LA118.
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Accident occurred Sunday, May 20, 2007 in Hilltop Lakes, TX
Probable Cause Approval Date: 07/25/2007
Aircraft: Grumman American AA-5B, registration: N28730
Injuries: 2 Serious.
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 300-hour private pilot reported that the airplane entered an un-commanded nose down pitch and banked to the left while the airplane was established on final approach to runway 16. The pilot and passenger were seriously injured. An examination of the engine was conducted. Examination of the engine 180-horsepower engine did not reveal any mechanical anomalies that could have prevented normal engine operation. The fuel cells were breached; however, the operator reported that the airplane departed the airport with a full load of fuel, and according to the engine tach, the flight's duration was 36 minutes. According to icing probability chart, the weather conditions at the time of the accident were favorable for the probability of "serious" carburetor icing at glide power. Examination of the airplane and engine revealed that the carburetor heat control was in the "off" or "cold" position. The pilot and passenger were seriously injured. Weather reported 30 miles south of the accident site at the time of the accident stated winds were from 120 degrees at 9 knots gusting to 14 knots.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The loss of engine power due to carburetor ice. Contributing factors were the lack of suitable terrain for a forced landing and the weather conditions that were conducive to carburetor ice. Full narrative available
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