Narrative:

While cruising at FL370, just south of terre haute, in, aircraft X suddenly made a slight yaw to the right. The autoplt and autothrottles were disengaged and an assessment was made of both engines. The left engine had normal indications. The right engine had no oil pressure and no N2 RPM. The right engine egt dropped considerably and the N1 RPM was wind milling. Oil quantity for the right engine was over 12 quarts (normal). Right engine oil temperature was normal. No vibration was felt. An emergency was declared and a descent was made to FL220. The engine fire/damage/separation checklist was completed. ATC was informed that we would be making an emergency landing in indianapolis and arff equipment was requested. Dispatch was informed. The flight attendants reported there was no noise, smoke, vibration -- just a sudden silence. I passed on the test information to the flight attendants and told them that an emergency evacuate/evacuation was unlikely, but I would like them to start the emergency checklist. Callback conversation with reporter revealed the following information: the reporter stated the exact cause of the seizure of the N2 rotor is unknown as maintenance has not released any findings. The reporter said when the engine failed only a slight yaw to the right was noted. The reporter stated any engine seizure a rather abrupt and hard yaw would be expected, but this was different.

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Original NASA ASRS Text

Title: AN MD80 IN CRUISE AT FL370 DECLARED AN EMER AND DIVERTED DUE TO FAILURE OF THE R ENG N2 ROTOR.

Narrative: WHILE CRUISING AT FL370, JUST S OF TERRE HAUTE, IN, ACFT X SUDDENLY MADE A SLIGHT YAW TO THE R. THE AUTOPLT AND AUTOTHROTTLES WERE DISENGAGED AND AN ASSESSMENT WAS MADE OF BOTH ENGS. THE L ENG HAD NORMAL INDICATIONS. THE R ENG HAD NO OIL PRESSURE AND NO N2 RPM. THE R ENG EGT DROPPED CONSIDERABLY AND THE N1 RPM WAS WIND MILLING. OIL QUANTITY FOR THE R ENG WAS OVER 12 QUARTS (NORMAL). R ENG OIL TEMP WAS NORMAL. NO VIBRATION WAS FELT. AN EMER WAS DECLARED AND A DSCNT WAS MADE TO FL220. THE ENG FIRE/DAMAGE/SEPARATION CHKLIST WAS COMPLETED. ATC WAS INFORMED THAT WE WOULD BE MAKING AN EMER LNDG IN INDIANAPOLIS AND ARFF EQUIP WAS REQUESTED. DISPATCH WAS INFORMED. THE FLT ATTENDANTS RPTED THERE WAS NO NOISE, SMOKE, VIBRATION -- JUST A SUDDEN SILENCE. I PASSED ON THE TEST INFO TO THE FLT ATTENDANTS AND TOLD THEM THAT AN EMER EVAC WAS UNLIKELY, BUT I WOULD LIKE THEM TO START THE EMER CHKLIST. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE EXACT CAUSE OF THE SEIZURE OF THE N2 ROTOR IS UNKNOWN AS MAINT HAS NOT RELEASED ANY FINDINGS. THE RPTR SAID WHEN THE ENG FAILED ONLY A SLIGHT YAW TO THE R WAS NOTED. THE RPTR STATED ANY ENG SEIZURE A RATHER ABRUPT AND HARD YAW WOULD BE EXPECTED, BUT THIS WAS DIFFERENT.

Data retrieved from NASA's ASRS site as of July 2007 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.