Hard Landing After Engine Problems; Fuel System Contamination Found (N390BC)

Accident Sequence

Upon accepting a clearance to climb to 3,500 feet mean sea level, the pilot increased engine power. The pilot then observed on the engine data management unit that no bars were illuminated for cylinder number 5. The pilot reported to air traffic control that the airplane was experiencing engine problems and requested a diversion to the nearest airport. While receiving directions, the pilot noticed that cylinder number 4 also had no readout. The pilot advised air traffic control that he was unable to make the airport and initiated a forced landing. During the landing flare, the airspeed decreased rapidly, causing the stall horn to activate and the airplane to accelerate toward the ground. The airplane landed hard and came to rest upright in a grass field.

Post-Accident Examination

Examination of the airframe fuel filter revealed that the fuel filter screen showed evidence of corrosion, and the housing was full of fuel. Examination of the fuel manifold showed that the topside of the screen contained debris. The number 3 fuel nozzle was blocked with contaminants. Debris was found in the number 4, number 5, and number 6 fuel nozzles. The number 1 manifold to fuel nozzle fuel line was partially blocked.