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B747 cargo over dlh has compressor stall. Reduced thrust. Had second stall resulting in declaring emergency, dumping 90000 pounds of fuel and diverting to msp.
| Attributes | |
| ACN | 348302 |
| Time | |
| Date | 199609 |
| Day | Wed |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : dlh |
| State Reference | MN |
| Altitude | msl bound lower : 29000 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp |
| Operator | common carrier : air carrier |
| Make Model Name | B747-C/F |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : commercial pilot : instrument pilot : private pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 15000 flight time type : 200 |
| ASRS Report | 348302 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | controller military : 22 flight time last 90 days : 140 flight time total : 15000 flight time type : 7000 |
| ASRS Report | 348307 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : declared emergency flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
During cruise, we experienced multiple compressor stalls on #3 engine. After second occurrence, the engine was shut down. Soon after we felt vibration. Decided to dump fuel (90000 pounds) and return to msp airport. Uneventful from then on. Declared emergency just to be on safe side. Don't know why this happened or even how to prevent it in the future. Supplemental information from acn 348307: #3 engine compressor stalled. Retarded throttle. No significant engine indications other than loss of EPR (.20) during loud stall. Reapplied power. Several mins (10 plus) later, #3 engine stalled again. Retarded throttle and precautionary shutdown.
Original NASA ASRS Text
Title: B747 CARGO OVER DLH HAS COMPRESSOR STALL. REDUCED THRUST. HAD SECOND STALL RESULTING IN DECLARING EMER, DUMPING 90000 LBS OF FUEL AND DIVERTING TO MSP.
Narrative: DURING CRUISE, WE EXPERIENCED MULTIPLE COMPRESSOR STALLS ON #3 ENG. AFTER SECOND OCCURRENCE, THE ENG WAS SHUT DOWN. SOON AFTER WE FELT VIBRATION. DECIDED TO DUMP FUEL (90000 LBS) AND RETURN TO MSP ARPT. UNEVENTFUL FROM THEN ON. DECLARED EMER JUST TO BE ON SAFE SIDE. DON'T KNOW WHY THIS HAPPENED OR EVEN HOW TO PREVENT IT IN THE FUTURE. SUPPLEMENTAL INFO FROM ACN 348307: #3 ENG COMPRESSOR STALLED. RETARDED THROTTLE. NO SIGNIFICANT ENG INDICATIONS OTHER THAN LOSS OF EPR (.20) DURING LOUD STALL. REAPPLIED PWR. SEVERAL MINS (10 PLUS) LATER, #3 ENG STALLED AGAIN. RETARDED THROTTLE AND PRECAUTIONARY SHUTDOWN.
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.