Narrative:

Takeoff and departure were uneventful. About 2.5 hours after takeoff; cruising at FL370 approximately 100 mi north of ZZZ we heard a loud bang from the left engine. Immediately following; the aircraft yawed to the left and both the autoplt and autothrottles disengaged. We cross checked the instruments and noted the left engine N1 and N2 indicated 0. Oil quantity was at 15 quarts with zero oil pressure indicated. There were no indications of fire but the engine had experienced a severe damage event. The captain immediately took control of the aircraft and I coordinated a descent with ATC and declared an emergency. Next; we worked the QRH procedures for 'engine fire; severe damage or separation.' after that we ran the 1 engine inoperative landing QRH procedure as well. ATC; company; and flight attendant coordination were all accomplished as well. We diverted to ZZZ for an ILS runway X single-engine approach to a full stop on the runway. After crash and fire gave us the all clear; we opted to be towed to the gate for deplaning of the passenger. No injuries were reported; so no medical attention was required. The passenger reported a momentary fire from the engine at the seizing moment but no fire indications were received in the cockpit. While being tugged to the gate; we reviewed the fom post-incident checklist and completed a logbook entry. Postflt examination revealed the N1 fan would only turn about 4 inches. No external damage was readily apparent.

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Original NASA ASRS Text

Title: A B737-800 FLT CREW EXPERIENCED SEVERE ENGINE DAMAGE IN CRUISE FLIGHT. THEY SHUT DOWN THE ENGINE; DECLARED AN EMERGENCY; COORDINATED WITH DISPATCH AND MAINT; AND DIVERTED TO THE NEAREST SUITABLE AIRPORT.

Narrative: TKOF AND DEP WERE UNEVENTFUL. ABOUT 2.5 HRS AFTER TKOF; CRUISING AT FL370 APPROX 100 MI N OF ZZZ WE HEARD A LOUD BANG FROM THE L ENG. IMMEDIATELY FOLLOWING; THE ACFT YAWED TO THE L AND BOTH THE AUTOPLT AND AUTOTHROTTLES DISENGAGED. WE CROSS CHKED THE INSTRUMENTS AND NOTED THE L ENG N1 AND N2 INDICATED 0. OIL QUANTITY WAS AT 15 QUARTS WITH ZERO OIL PRESSURE INDICATED. THERE WERE NO INDICATIONS OF FIRE BUT THE ENG HAD EXPERIENCED A SEVERE DAMAGE EVENT. THE CAPT IMMEDIATELY TOOK CTL OF THE ACFT AND I COORDINATED A DSCNT WITH ATC AND DECLARED AN EMER. NEXT; WE WORKED THE QRH PROCS FOR 'ENG FIRE; SEVERE DAMAGE OR SEPARATION.' AFTER THAT WE RAN THE 1 ENG INOP LNDG QRH PROC AS WELL. ATC; COMPANY; AND FLT ATTENDANT COORD WERE ALL ACCOMPLISHED AS WELL. WE DIVERTED TO ZZZ FOR AN ILS RWY X SINGLE-ENG APCH TO A FULL STOP ON THE RWY. AFTER CRASH AND FIRE GAVE US THE ALL CLR; WE OPTED TO BE TOWED TO THE GATE FOR DEPLANING OF THE PAX. NO INJURIES WERE RPTED; SO NO MEDICAL ATTN WAS REQUIRED. THE PAX RPTED A MOMENTARY FIRE FROM THE ENG AT THE SEIZING MOMENT BUT NO FIRE INDICATIONS WERE RECEIVED IN THE COCKPIT. WHILE BEING TUGGED TO THE GATE; WE REVIEWED THE FOM POST-INCIDENT CHKLIST AND COMPLETED A LOGBOOK ENTRY. POSTFLT EXAM REVEALED THE N1 FAN WOULD ONLY TURN ABOUT 4 INCHES. NO EXTERNAL DAMAGE WAS READILY APPARENT.

Data retrieved from NASA's ASRS site as of May 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.