Narrative:

On initial climb from lex, both the captain and first officer noted momentary power fluctuations occurring on the left engine accompanied by slight yawing of the aircraft. The first officer, who was also the PNF, later confirmed that these fluctuations were noted on the left torque gauge and ranged from approximately 30-110% torque in rapid succession. Exact readings were difficult to obtain due to the speed of occurrences (less than 2 seconds per occurrence). No other abnormal engine parameters were noted and the total time of the event was less than 10 seconds. With no other malfunction indication other than torque fluctuation, I concluded these were possible compressor stalls and asked the first officer to begin the QRH procedures for such an occurrence. After the constant torque on takeoff was turned off per the QRH, normal engine operation resumed. All engine parameters returned to normal and remained there under close monitor from both pilots for the duration of the flight. We completed the procedure outlined in the QRH upon reaching a safe altitude and resumed normal operation. After discussion of the events with the first officer, I made notes to include in my write-up to maintenance control. On xferring these notes to the ship's mmi logbook, I incorrectly noted that the torque had fluctuated from '30-120%' when in fact the actual values were approximately 30- 110%. In hindsight, I should have had the first officer review the write-up before forwarding to maintenance control. The engine never exceeded limitations and remained stable after the occurrence. We proceeded to dtw and landed without incident.

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Original NASA ASRS Text

Title: AN ACR SF34 FLC EXPERIENCED COMPRESSOR STALLS ON THE L ENG DURING INITIAL CLBOUT. THEY TURNED OFF THE CONSTANT TORQUE ON TKOF SYS (AN AUTOPLT TYPE OF SYS) AND THE ENG RETURNED TO NORMAL OP.

Narrative: ON INITIAL CLB FROM LEX, BOTH THE CAPT AND FO NOTED MOMENTARY PWR FLUCTUATIONS OCCURRING ON THE L ENG ACCOMPANIED BY SLIGHT YAWING OF THE ACFT. THE FO, WHO WAS ALSO THE PNF, LATER CONFIRMED THAT THESE FLUCTUATIONS WERE NOTED ON THE L TORQUE GAUGE AND RANGED FROM APPROX 30-110% TORQUE IN RAPID SUCCESSION. EXACT READINGS WERE DIFFICULT TO OBTAIN DUE TO THE SPD OF OCCURRENCES (LESS THAN 2 SECONDS PER OCCURRENCE). NO OTHER ABNORMAL ENG PARAMETERS WERE NOTED AND THE TOTAL TIME OF THE EVENT WAS LESS THAN 10 SECONDS. WITH NO OTHER MALFUNCTION INDICATION OTHER THAN TORQUE FLUCTUATION, I CONCLUDED THESE WERE POSSIBLE COMPRESSOR STALLS AND ASKED THE FO TO BEGIN THE QRH PROCS FOR SUCH AN OCCURRENCE. AFTER THE CONSTANT TORQUE ON TKOF WAS TURNED OFF PER THE QRH, NORMAL ENG OP RESUMED. ALL ENG PARAMETERS RETURNED TO NORMAL AND REMAINED THERE UNDER CLOSE MONITOR FROM BOTH PLTS FOR THE DURATION OF THE FLT. WE COMPLETED THE PROC OUTLINED IN THE QRH UPON REACHING A SAFE ALT AND RESUMED NORMAL OP. AFTER DISCUSSION OF THE EVENTS WITH THE FO, I MADE NOTES TO INCLUDE IN MY WRITE-UP TO MAINT CTL. ON XFERRING THESE NOTES TO THE SHIP'S MMI LOGBOOK, I INCORRECTLY NOTED THAT THE TORQUE HAD FLUCTUATED FROM '30-120%' WHEN IN FACT THE ACTUAL VALUES WERE APPROX 30- 110%. IN HINDSIGHT, I SHOULD HAVE HAD THE FO REVIEW THE WRITE-UP BEFORE FORWARDING TO MAINT CTL. THE ENG NEVER EXCEEDED LIMITATIONS AND REMAINED STABLE AFTER THE OCCURRENCE. WE PROCEEDED TO DTW AND LANDED WITHOUT INCIDENT.

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.