Incident Overview
During an instrument approach to Waukegan Airport, the pilot informed the controller of an oil leak in the right engine. Several minutes later, the pilot reported losing sight of the airport and, due to a loss of power in the right engine, decided to land in a plowed field. Upon landing, the landing gear collapsed.
Examination Findings
Post-incident examination of the right engine oil scavenge pump revealed that the drive gear had fractured into five pieces. Four of the five fractures showed evidence of an overload-type failure. One fracture surface, however, bore evidence of a pre-existing fatigue-type failure.
Conclusion
The source does not provide a stated probable cause for the incident.