Accident Details
On November 16, 2010, at approximately 0940 eastern standard time, a Cessna 172 (registration N8306B) was substantially damaged during a forced landing following an in-flight loss of engine power. The accident occurred near Hobe Sound, Florida. The airplane was operated by a private individual, and the certificated airline transport pilot was not injured. Day, visual meteorological conditions prevailed, and no flight plan was filed for the personal flight from Jupiter, Florida, to Jacksonville, Florida (CRG). The flight originated at Tailwinds Airport (FD15) at 0915 and was conducted under 14 CFR Part 91.
Pilot Actions
The pilot reported that approximately 20 minutes into the flight, the engine began to lose power. He informed air traffic control of the situation and requested a vector to the closest airport. By actuating the fuel primer knob, the pilot was able to keep the engine running, but the airplane could not maintain altitude. The pilot performed an emergency landing in an orange grove near Hobe Sound. The airplane touched down in soft terrain and nosed over.
Examination Findings
An inspector from the Federal Aviation Administration examined the wreckage and reported substantial damage to the wings. During recovery, positive fuel flow to the engine was confirmed, and the fuel tank vents were clear. All fuel screens were clear, and the air intake was unobstructed. The throttle, mixture, and carburetor heat controls operated normally. The spark plugs were removed and exhibited normal wear and color. The engine was turned by hand and internal continuity was confirmed, with compression observed on all cylinders.
The carburetor was removed, and the accelerator pump operated normally when actuated by hand. Fuel was present in the carburetor bowl. Disassembly revealed that the needle valve and seat were undamaged. A thick, slimy substance, black and brown in color, was found in the carburetor bowl drain plug, obstructing the fuel channel in the carburetor. The origin of the contamination was not determined.
Maintenance History
A review of the engine logbook indicated that the last annual inspection was performed on August 16, 2010. No discrepancies with the carburetor were noted. At the time of the accident, the airplane had been operated approximately 11 hours since the last annual inspection.