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Pc-12 captain reported returning to departure airport after noticing the torque gauge surging shortly after takeoff.
| Attributes | |
| ACN | 1339482 |
| Time | |
| Date | 201603 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Tower |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | PC-12 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Turbine Engine |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 75 Flight Crew Total 5000 Flight Crew Type 700 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
[We] lined up for takeoff. After setting power at 43 psi torque; a standard takeoff occurred. At approximately 300 ft. AGL; the master caution illuminated and I saw the torque gauge surging back and forth from 35-51 psi (above max limitations); without anyone touching the throttle. I tried adjusting the throttle lower; to no avail. I did not feel the engine itself surge; but being so close to the ground and concentrating on flying; I could not check all the other gauges and diagnose the problem properly. I asked the copilot (who had just switched to departure frequency) to advise we needed to remain in the pattern and return to land immediately. The copilot relayed that to ATC; who asked if we were [requesting] for priority (they were busy at the time). We remained left closed traffic and ran the appropriate check lists. Once the power was pulled back to about 30 psi; the torque surging stopped. Two aircraft on final were given go around/vectors as a result of our [situation]. We made an uneventful landing and taxied in. No emergency services were used or ever seen.
Original NASA ASRS Text
Title: PC-12 Captain reported returning to departure airport after noticing the torque gauge surging shortly after takeoff.
Narrative: [We] lined up for takeoff. After setting power at 43 PSI Torque; a standard takeoff occurred. At approximately 300 ft. AGL; the Master Caution illuminated and I saw the Torque gauge surging back and forth from 35-51 PSI (above max limitations); without anyone touching the throttle. I tried adjusting the throttle lower; to no avail. I did not feel the engine itself surge; but being so close to the ground and concentrating on flying; I could not check all the other gauges and diagnose the problem properly. I asked the copilot (who had just switched to departure frequency) to advise we needed to remain in the pattern and return to land immediately. The copilot relayed that to ATC; who asked if we were [requesting] for priority (they were busy at the time). We remained left closed traffic and ran the appropriate check lists. Once the power was pulled back to about 30 PSI; the torque surging stopped. Two aircraft on final were given go around/vectors as a result of our [situation]. We made an uneventful landing and taxied in. No emergency services were used or ever seen.
Data retrieved from NASA's ASRS site 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.