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An ATR72 crew secured an engine displaying surging torque. Engine shutdown was performed and an emergency was declared.
| Attributes | |
| ACN | 654658 |
| Time | |
| Date | 200504 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | other pilot : atp pilot : flight engineer |
| Experience | controller radar : 10 flight time last 90 days : 120 flight time total : 5000 flight time type : 420 |
| ASRS Report | 654658 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : declared emergency flight crew : landed in emergency condition |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
En route to ZZZ2 from ZZZ; at 12000 ft; captain flying. The left engine dropped from about 83% torque to 10% torque. Before we could even begin the 'engine failure fire in-flight' checklist; the power came back to normal. As we were speaking to our maintenance control; the torque on same engine went to around 97%. At this point we decided to shut engine down and performed engine failure fire in-flight checklist; followed by single engine landing checklist. Declared emergency. I then advised the flight attendants of the situation and also made a PA to the passenger. We again tried to reach maintenance and flight control; but were unable. I called our operations at ZZZ2 to tell them to call flight control and that we'd be landing shortly. We finished all remaining checklists and landed uneventfully.
Original NASA ASRS Text
Title: AN ATR72 CREW SECURED AN ENG DISPLAYING SURGING TORQUE. ENG SHUTDOWN WAS PERFORMED AND AN EMER WAS DECLARED.
Narrative: ENRTE TO ZZZ2 FROM ZZZ; AT 12000 FT; CAPT FLYING. THE L ENG DROPPED FROM ABOUT 83% TORQUE TO 10% TORQUE. BEFORE WE COULD EVEN BEGIN THE 'ENG FAILURE FIRE INFLT' CHKLIST; THE PWR CAME BACK TO NORMAL. AS WE WERE SPEAKING TO OUR MAINT CTL; THE TORQUE ON SAME ENG WENT TO AROUND 97%. AT THIS POINT WE DECIDED TO SHUT ENG DOWN AND PERFORMED ENG FAILURE FIRE INFLT CHKLIST; FOLLOWED BY SINGLE ENG LNDG CHKLIST. DECLARED EMER. I THEN ADVISED THE FLT ATTENDANTS OF THE SIT AND ALSO MADE A PA TO THE PAX. WE AGAIN TRIED TO REACH MAINT AND FLT CTL; BUT WERE UNABLE. I CALLED OUR OPS AT ZZZ2 TO TELL THEM TO CALL FLT CTL AND THAT WE'D BE LNDG SHORTLY. WE FINISHED ALL REMAINING CHKLISTS AND LANDED UNEVENTFULLY.
Data retrieved from NASA's ASRS site as of January 2009 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.