B737 flight crew reported a '...yaw; vibration; and N1 rollback on #2 engine;' resulting in a diversion to the nearest suitable airport.
Synopsis
B737 flight crew reported a '...yaw; vibration; and N1 rollback on #2 engine;' resulting in a diversion to the nearest suitable airport.
Narrative
Approximately 2+35 into the flight from ZZZ2 to ZZZ1. At FL410 and Mach .79 at approximately XA45 a noticeable bang was heard followed by yaw; vibration; and N1 rollback on #2 engine. Within 5 seconds the immediate action items for Eng Fire/Severe Damage (vibration) was completed and within approximately 7 seconds a shallow descent (500 FPM) was initiated by the pilot flying (PF). At this time the pilot not flying (PNF) [requested priority handling] with ATC and coordinated a descent to 24;000 ft. direct ZZZ. The PNF then ran the QRC/QRH checklist for Eng Fire/Severe Damage (read-and-do with proper crew coordinated.) No fire warn/indicator lights illuminated; T-Handel pulled no bottles blown. The EGT gauge on #2 engine illuminated red but I never noticed and temp higher than low-mid 800s. This (EGT) eventually extinguished (completely cooled by approximately 10000 ft.); N1/N2 never completely stopped rotation throughout the remainder of the flight; never seized.The PF continued to follow ATC vectors and altitudes in a large box pattern E and N of ZZZ at 250 kts. while the PNF coordinated with ATC (Crash/Fire Rescue; Intentions to land XXL (XXR closed); full stop on the runway); flight attendants (Brief); passenger notification; and finished up all appropriate checklists; and normal operating checklists as applicable. The Captain took over PF duties at 3;000 ft. on a vector to intercept for the visual approach Runway XXL (w/ ILS backup) at approximately 13 DME. The PF made a flawless flaps 15; auto brake 3; app/landing. A full stop on the runway was performed and Crash Fire Rescue quickly met the aircraft and determined no immediate threat present. Passengers and Flight Attendants were kept informed throughout the event. Crash/Fire Rescue followed the aircraft to the gate and passengers were deplaned. Post inspection by both pilots reveled a normal N1 section with a completely destroyed turbine section. ATC; Crash/Fire Rescue; Operations/Maintenance; and Flight Attendants performed exceptionally.
Second reporter narrative
At 41;000 feet during cruise felt a slight shudder and saw engine 2 roll back. EGT was rising and did immediate action items for severe engine damage followed by rest of that checklist. Diverted into ZZZ and did a single engine landing and had Crash Fire Rescue (CFR) vehicles check for damage and told just a slight fluid leak so taxied to gate and deplaned.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.