|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||airport : tpa.airport|
|Altitude||agl single value : 0|
|Operator||common carrier : air carrier|
|Make Model Name||B757-200|
|Operating Under FAR Part||Part 121|
|Flight Phase||ground : maintenance|
ground : parked
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Affiliation||company : air carrier|
|Function||flight crew : first officer|
|Anomaly||aircraft equipment problem : critical|
inflight encounter : weather
inflight encounter other
|Independent Detector||aircraft equipment other aircraft equipment : eng fan blade|
other other : fa 3
|Resolutory Action||none taken : detected after the fact|
During climb out from kfll, a flight attendant called the cockpit and expressed concern about a pressurization leak-type noise at 2R door. She said it was 'unusually loud' at that location. A quick check of pertinent indications by my first officer and I revealed all instruments were normal, no engine vibration or any other noise was detected on the flight deck. We wrote up a possible 'pressurization noise/leak at 2R door' in the maintenance logbook, sent an ACARS advisement to the maintenance coordinator, and advised tpa operations/maintenance as well of the possible pressure leak. On the ground in ktpa during the deplaning process, the purser and her flying partners further expressed concern regarding the noise stating 'it could be the right engine, it just does not sound right.' I thoroughly discussed these concerns with the purser and other flight attendants, and then went outside to inspect the right engine. Upon careful inspection of the engine, it was observed there were 6 fan blades, symmetrically spaced (approximately) 60 degrees apart in the fan assembly, with their tips 'bent forward.' the nature of the damage was perplexing due to an assumption that if we had ingested a foreign object, one would expect the fan blades to be bent aft. Maintenance was advised of the blade condition, and a logbook entry was made. When the external area of the aircraft was preflted in kfll, the right engine was still running, therefore, a second inspection was made of the right engine after it was shut down. Although the right engine was still rotating due to wind, no abnormal fan blade conditions were noted. Further, there was no advisement by ground crew following their exterior inspection of the aircraft that there was anything with the aircraft. It is unclr as to how a crewman can preflight inspect an engine's fan blades while they are spinning, but perhaps that is something that technicians could look at as an operational challenge. An increased vigilance by all flight crew's to engine anti-ice run-ups may also be appropriate.
Original NASA ASRS Text
Title: B757-200 CREW HAD DAMAGE TO #2 ENG FAN BLADES THAT WAS DETECTED BY THE FLT ATTENDANTS.
Narrative: DURING CLBOUT FROM KFLL, A FLT ATTENDANT CALLED THE COCKPIT AND EXPRESSED CONCERN ABOUT A PRESSURIZATION LEAK-TYPE NOISE AT 2R DOOR. SHE SAID IT WAS 'UNUSUALLY LOUD' AT THAT LOCATION. A QUICK CHK OF PERTINENT INDICATIONS BY MY FO AND I REVEALED ALL INSTS WERE NORMAL, NO ENG VIBRATION OR ANY OTHER NOISE WAS DETECTED ON THE FLT DECK. WE WROTE UP A POSSIBLE 'PRESSURIZATION NOISE/LEAK AT 2R DOOR' IN THE MAINT LOGBOOK, SENT AN ACARS ADVISEMENT TO THE MAINT COORDINATOR, AND ADVISED TPA OPS/MAINT AS WELL OF THE POSSIBLE PRESSURE LEAK. ON THE GND IN KTPA DURING THE DEPLANING PROCESS, THE PURSER AND HER FLYING PARTNERS FURTHER EXPRESSED CONCERN REGARDING THE NOISE STATING 'IT COULD BE THE R ENG, IT JUST DOES NOT SOUND RIGHT.' I THOROUGHLY DISCUSSED THESE CONCERNS WITH THE PURSER AND OTHER FLT ATTENDANTS, AND THEN WENT OUTSIDE TO INSPECT THE R ENG. UPON CAREFUL INSPECTION OF THE ENG, IT WAS OBSERVED THERE WERE 6 FAN BLADES, SYMMETRICALLY SPACED (APPROX) 60 DEGS APART IN THE FAN ASSEMBLY, WITH THEIR TIPS 'BENT FORWARD.' THE NATURE OF THE DAMAGE WAS PERPLEXING DUE TO AN ASSUMPTION THAT IF WE HAD INGESTED A FOREIGN OBJECT, ONE WOULD EXPECT THE FAN BLADES TO BE BENT AFT. MAINT WAS ADVISED OF THE BLADE CONDITION, AND A LOGBOOK ENTRY WAS MADE. WHEN THE EXTERNAL AREA OF THE ACFT WAS PREFLTED IN KFLL, THE R ENG WAS STILL RUNNING, THEREFORE, A SECOND INSPECTION WAS MADE OF THE R ENG AFTER IT WAS SHUT DOWN. ALTHOUGH THE R ENG WAS STILL ROTATING DUE TO WIND, NO ABNORMAL FAN BLADE CONDITIONS WERE NOTED. FURTHER, THERE WAS NO ADVISEMENT BY GND CREW FOLLOWING THEIR EXTERIOR INSPECTION OF THE ACFT THAT THERE WAS ANYTHING WITH THE ACFT. IT IS UNCLR AS TO HOW A CREWMAN CAN PREFLT INSPECT AN ENG'S FAN BLADES WHILE THEY ARE SPINNING, BUT PERHAPS THAT IS SOMETHING THAT TECHNICIANS COULD LOOK AT AS AN OPERATIONAL CHALLENGE. AN INCREASED VIGILANCE BY ALL FLT CREW'S TO ENG ANTI-ICE RUN-UPS MAY ALSO BE APPROPRIATE.
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.