Narrative:

Level at FL360, had a compressor stall on the right engine. Per the checklist, the engine was reduced to idle thrust. We then had to divert to ZZZZ. Fuel was dumped to get below landing weight (approximately 6000 pounds). Landing was uneventful on runway 33. After walkaround, no visible damage to engine. Callback conversation with reporter revealed the following information: the reporter stated the right engine had a compressor problem but no information was released by maintenance other than it was an engine change. The reporter said the engine was in the shop for teardown. Supplemental information from acn 611614: engine was not shut down. Driftdown checklist ran, descent to FL230 initiated, clearance given by ATC to remain on course to FL230. We were in VHF communication with center, but not in radar contact. Coordination efforts began, with satvoice conference with dispatch and maintenance. A coordination fuel dump of about 6000 pounds was accomplished. Flight attendants briefed, and a cabin advisory was ordered. Passenger appropriately briefed by captain. Supplemental information from acn 611626: discussions with dispatch on satcom communications confirmed that the ETOPS alternate was the most suitable. We flew for about 1 hour 30 mins using only the left engine for significant thrust. We had excellent help throughout the diversion from our dispatch personnel, the controllers, and the people of ZZZZ. One pilot controled the aircraft. One pilot communicated with dispatch and maintenance. The third pilot went through the checklists with the operation pilot. At times we all came together to discuss present information and future needs. It seemed just like the simulator and the training worked very well. We did note that the initial descent from cruise was steeper than necessary due to retarding both engines during the immediate action steps in the attempt to reduce any future compressor stalls.

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Original NASA ASRS Text

Title: B777-200 IN CRUISE AT FL360 DIVERTED DUE TO COMPRESSOR STALL AND LOSS OF PWR ON THE R ENG. ENG OPERATED AT IDLE PWR.

Narrative: LEVEL AT FL360, HAD A COMPRESSOR STALL ON THE R ENG. PER THE CHKLIST, THE ENG WAS REDUCED TO IDLE THRUST. WE THEN HAD TO DIVERT TO ZZZZ. FUEL WAS DUMPED TO GET BELOW LNDG WT (APPROX 6000 LBS). LNDG WAS UNEVENTFUL ON RWY 33. AFTER WALKAROUND, NO VISIBLE DAMAGE TO ENG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE R ENG HAD A COMPRESSOR PROB BUT NO INFO WAS RELEASED BY MAINT OTHER THAN IT WAS AN ENG CHANGE. THE RPTR SAID THE ENG WAS IN THE SHOP FOR TEARDOWN. SUPPLEMENTAL INFO FROM ACN 611614: ENG WAS NOT SHUT DOWN. DRIFTDOWN CHKLIST RAN, DSCNT TO FL230 INITIATED, CLRNC GIVEN BY ATC TO REMAIN ON COURSE TO FL230. WE WERE IN VHF COM WITH CTR, BUT NOT IN RADAR CONTACT. COORD EFFORTS BEGAN, WITH SATVOICE CONFERENCE WITH DISPATCH AND MAINT. A COORD FUEL DUMP OF ABOUT 6000 LBS WAS ACCOMPLISHED. FLT ATTENDANTS BRIEFED, AND A CABIN ADVISORY WAS ORDERED. PAX APPROPRIATELY BRIEFED BY CAPT. SUPPLEMENTAL INFO FROM ACN 611626: DISCUSSIONS WITH DISPATCH ON SATCOM COMS CONFIRMED THAT THE ETOPS ALTERNATE WAS THE MOST SUITABLE. WE FLEW FOR ABOUT 1 HR 30 MINS USING ONLY THE L ENG FOR SIGNIFICANT THRUST. WE HAD EXCELLENT HELP THROUGHOUT THE DIVERSION FROM OUR DISPATCH PERSONNEL, THE CTLRS, AND THE PEOPLE OF ZZZZ. ONE PLT CTLED THE ACFT. ONE PLT COMMUNICATED WITH DISPATCH AND MAINT. THE THIRD PLT WENT THROUGH THE CHKLISTS WITH THE OP PLT. AT TIMES WE ALL CAME TOGETHER TO DISCUSS PRESENT INFO AND FUTURE NEEDS. IT SEEMED JUST LIKE THE SIMULATOR AND THE TRAINING WORKED VERY WELL. WE DID NOTE THAT THE INITIAL DSCNT FROM CRUISE WAS STEEPER THAN NECESSARY DUE TO RETARDING BOTH ENGS DURING THE IMMEDIATE ACTION STEPS IN THE ATTEMPT TO REDUCE ANY FUTURE COMPRESSOR STALLS.

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.