Incident Overview
While cruising at 2,200 feet mean sea level, the pilot observed a gradual loss of power in the right engine. The engine rpm subsequently stabilized at approximately 1,400. During attempts to diagnose the issue, the aircraft's cabin door opened unexpectedly.
Decision to Continue
Rather than diverting to one of the airports passed en route, the pilot chose to proceed toward the original destination. Difficulty maintaining altitude with the door partially open and the right engine at reduced power led the pilot to shut down the right engine.
Forced Landing
After securing the right engine, the pilot realized that the remaining altitude was insufficient to reach an airport. A decision was made to land in a nearby field. The landing was performed with the landing gear intentionally retracted to negotiate soft, wet terrain. The aircraft sustained substantial damage during the landing.
Investigation Findings
The investigation revealed that the aircraft had not been flown for nearly 13 years prior to this flight. Prior to departure, the pilot observed a thick, gooey, white substance draining from the right fuel sump but did not conduct further examination of the fuel system.
Cause of Power Loss
The loss of power was ultimately determined to have been caused by the accumulation of solid contaminants in the carburetor finger screen. This buildup substantially restricted fuel flow to the cylinders.