What happened
During the initial climbout phase of flight, the pilot reported that the airplane's engine lost power. Unable to maintain altitude, the pilot executed a forced landing in a nearby wooded area. The aircraft struck trees and the terrain during the descent and impact sequence. Following the collision with the ground, the airplane caught fire.
The investigation
A post-accident examination of the powerplant revealed no pre-impact mechanical issues or anomalies that would have caused the loss of power. Investigators inspected the fuel system components, which had been subjected to significant heat and physical damage during the crash and subsequent fire. While vented fuel caps had been installed on the aircraft, they were damaged beyond inspection due to the intensity of the post-impact fire.
Findings
Further examination of the wreckage identified a specific obstruction in the fuel system. The vent for the right wing fuel tank was partially obscured by a mud dauber's nest. This blockage likely impeded proper fuel flow or ventilation, contributing to the engine's failure. No other mechanical or operational reasons for the loss of engine power were found during the investigation.
Safety message
Regular inspection and maintenance of aircraft fuel system vents are critical to ensure unobstructed fuel flow. Builders and occupants near airfields should be aware that wildlife, such as mud daubers, may construct nests in these areas, potentially causing operational hazards.