Incident Overview
During takeoff, about five seconds after setting engines to 104% N1, the N1 on engine number 2 dropped to 78%, triggering engine fail and master caution lights. The takeoff was rejected, and the number 2 engine was shut down. After emergency personnel examined the aircraft, all engines were shut down, and the airplane was towed to the gate. Passengers deplaned via the jetway.
Investigation Findings
The investigation revealed that all second-stage turbine nozzle locks had failed. The nozzles exited through a hole in the engine case. This marked the second uncontained failure of a CF6-50 engine.
Previous Inspections
Following the first uncontained failure, a special inspection was initiated, which the aircraft had already received. Prior to departure, the number 2 engine had undergone a zone inspection, described as a general visual inspection. No failed nozzle locks were reported, but the inspection did not specifically address inspection of the nozzle locks.