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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Approximately 8500 ft the reporter noticed #2 engine N1 was fluctuating, a surging noise occurred with a rapid drop in N1 RPM. The captain retarded the throttle, contacted departure, declared an emergency, and returned to cle. A heavy weight single engine landing was made with the #2 engine at idle rather than shut down. The engine was shut down after landing. The crash fire rescue equipment equipment was standing by.
| Attributes | |
| ACN | 332251 |
| Time | |
| Date | 199604 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : djb airport : cle |
| State Reference | OH |
| Altitude | agl bound lower : 0 agl bound upper : 8500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : cle |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : flight engineer |
| Experience | flight time last 90 days : 100 flight time total : 9000 flight time type : 900 |
| ASRS Report | 332251 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Takeoff was completed, climb power setting was set. As we were passing through approximately 8500 ft MSL, I noticed the #2 engine N1 was fluctuating slightly. All other engine indications appeared normal. At about that time a loud surging noise occurred with rapid drop in #2 engine RPM. I leveled off immediately. The captain retarded the #2 engine throttle and contacted departure and declared an emergency with a return to cle airport where we had just left. At reduced power, surging quit but low rumble could still be heard and I could feel vibration in the controls. Heavy weight single engine landing was completed with power on #2 engine at idle thrust. Crash equipment was available on landing, but was not required. #2 engine was shut down after landing and emergency was terminated. Aircraft was taxied to gate and passenger were deplaned normally. (77 passenger and 5 crew members.)
Original NASA ASRS Text
Title: APPROX 8500 FT THE RPTR NOTICED #2 ENG N1 WAS FLUCTUATING, A SURGING NOISE OCCURRED WITH A RAPID DROP IN N1 RPM. THE CAPT RETARDED THE THROTTLE, CONTACTED DEP, DECLARED AN EMER, AND RETURNED TO CLE. A HVY WT SINGLE ENG LNDG WAS MADE WITH THE #2 ENG AT IDLE RATHER THAN SHUT DOWN. THE ENG WAS SHUT DOWN AFTER LNDG. THE CFR EQUIP WAS STANDING BY.
Narrative: TKOF WAS COMPLETED, CLB PWR SETTING WAS SET. AS WE WERE PASSING THROUGH APPROX 8500 FT MSL, I NOTICED THE #2 ENG N1 WAS FLUCTUATING SLIGHTLY. ALL OTHER ENG INDICATIONS APPEARED NORMAL. AT ABOUT THAT TIME A LOUD SURGING NOISE OCCURRED WITH RAPID DROP IN #2 ENG RPM. I LEVELED OFF IMMEDIATELY. THE CAPT RETARDED THE #2 ENG THROTTLE AND CONTACTED DEP AND DECLARED AN EMER WITH A RETURN TO CLE ARPT WHERE WE HAD JUST LEFT. AT REDUCED PWR, SURGING QUIT BUT LOW RUMBLE COULD STILL BE HEARD AND I COULD FEEL VIBRATION IN THE CTLS. HVY WT SINGLE ENG LNDG WAS COMPLETED WITH PWR ON #2 ENG AT IDLE THRUST. CRASH EQUIP WAS AVAILABLE ON LNDG, BUT WAS NOT REQUIRED. #2 ENG WAS SHUT DOWN AFTER LNDG AND EMER WAS TERMINATED. ACFT WAS TAXIED TO GATE AND PAX WERE DEPLANED NORMALLY. (77 PAX AND 5 CREW MEMBERS.)
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.