What happened
While flying at 500 feet AGL on an aerial application mission, the pilot experienced a slight loss of engine power and noted that fuel flow was below normal levels. The pilot attempted emergency procedures to address the issue; however, these actions failed to restore normal fuel flow.
During a turn initiated by the pilot, the engine suffered a complete loss of power approximately 10 seconds later. To extend the aircraft's glide, the pilot discharged the load of seed being carried. During the descent, the pilot observed smoke and blistering paint on the engine cowling. The pilot successfully completed a forced landing in an open field, but the airplane continued to burn following the impact.
The investigation
Investigators examined the wreckage and identified a leaking fuel hose within the engine compartment. This specific hose featured a stamp indicating it was manufactured in the first quarter of 1984 (1Q84).
According to the aircraft service manual, all fluid-carrying hoses located in the engine compartment are required to be replaced during an engine overhaul or every five years, whichever comes first. Records indicated that this hose had been installed 6 years and 7 months prior to the accident.