An oil leak and the plane crew deciding to land with both engines running caused a plane to drive off the runway a year ago in Thompson.
Investigators say that decision went against protocol.
Investigators also say the plane also was fitted with a flight management system capable of recording engine information, but it wasn't enabled.
The plane also had a cockpit voice recorder but didn't have flight data recorded, that equipment isn't legally required.
There were no passengers on the plane, two crew members sustained minor injuries, and the plane received substantial damage.
