Narrative:

Departed bos flight to den. WX on departure climb and cruise at 35000' was clear. At approximately XA55 we felt a bump. We checked the aircraft instruments and a visibility check wa also made. Nothing was abnormal. At about XC35 there was a more noticeable jolt, and immediately followed by heavy vibrations and noise. We shut down the right engine. This reduced the vibrations. F/a also confirmed the right engine had sparks and smoke coming out of it for a short time, but it cleared up. We asked for lower altitude and got it, 24000'. The aircraft was stable and flew very well. We ran all checklists and we chose dsm as the best choice. We informed ATC and hou dispatch through flight support. At this point I took over the aircraft. I asked the first officer to run the checklists and review single engine approach and go around. The aircraft handled very good on approach and landing. At the gate we deplaned with the airport people to check the aircraft. The first abnormal thing we noticed was blue fluid on the nose tire and ramp about 1-2 quarts on the right side of the aircraft from the lav service door. To full length of aircraft there were blue streaks. The lav service door was frozen (unable to open it). On top of the door was large lump of blue ice about the size of my fist. The right engine had visible damage to the large fan blades. We speculated that there had been ice build up at the lav service door and had broken off ingested in the right engine.

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Original NASA ASRS Text

Title: AT CRUISE ALT, ACFT INGESTED BLUE ICE, CAUSING COMPRESSOR BLADE DAMAGE. DIVERTED TO ALTERNATE.

Narrative: DEPARTED BOS FLT TO DEN. WX ON DEP CLB AND CRUISE AT 35000' WAS CLEAR. AT APPROX XA55 WE FELT A BUMP. WE CHKED THE ACFT INSTRUMENTS AND A VIS CHK WA ALSO MADE. NOTHING WAS ABNORMAL. AT ABOUT XC35 THERE WAS A MORE NOTICEABLE JOLT, AND IMMEDIATELY FOLLOWED BY HEAVY VIBRATIONS AND NOISE. WE SHUT DOWN THE RIGHT ENG. THIS REDUCED THE VIBRATIONS. F/A ALSO CONFIRMED THE RIGHT ENG HAD SPARKS AND SMOKE COMING OUT OF IT FOR A SHORT TIME, BUT IT CLRED UP. WE ASKED FOR LOWER ALT AND GOT IT, 24000'. THE ACFT WAS STABLE AND FLEW VERY WELL. WE RAN ALL CHKLISTS AND WE CHOSE DSM AS THE BEST CHOICE. WE INFORMED ATC AND HOU DISPATCH THROUGH FLT SUPPORT. AT THIS POINT I TOOK OVER THE ACFT. I ASKED THE F/O TO RUN THE CHKLISTS AND REVIEW SINGLE ENG APCH AND GAR. THE ACFT HANDLED VERY GOOD ON APCH AND LNDG. AT THE GATE WE DEPLANED WITH THE ARPT PEOPLE TO CHK THE ACFT. THE FIRST ABNORMAL THING WE NOTICED WAS BLUE FLUID ON THE NOSE TIRE AND RAMP ABOUT 1-2 QUARTS ON THE RIGHT SIDE OF THE ACFT FROM THE LAV SVC DOOR. TO FULL LENGTH OF ACFT THERE WERE BLUE STREAKS. THE LAV SVC DOOR WAS FROZEN (UNABLE TO OPEN IT). ON TOP OF THE DOOR WAS LARGE LUMP OF BLUE ICE ABOUT THE SIZE OF MY FIST. THE RIGHT ENG HAD VISIBLE DAMAGE TO THE LARGE FAN BLADES. WE SPECULATED THAT THERE HAD BEEN ICE BUILD UP AT THE LAV SVC DOOR AND HAD BROKEN OFF INGESTED IN THE RIGHT ENG.

Data retrieved from NASA's ASRS site as of August 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.