# SDR 0302081

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 8, 2003
- Submitted: February 9, 2003
- Operation: Air carrier
- Aircraft: [N146SD](https://openairdocs.org/aircraft/N146SD), registered now
- Make and model: Saab SF340A
- Registry model: [Saab SF340A](https://openairdocs.org/model/saab-scania-sf340a) (OpenAirDocs)
- Aircraft serial: 146
- Aircraft time: 28,113 hours, 30,684 cycles
- Engine: Ge CT75A2
- Engine time: 24,866 hours, 25,691 cycles
- Propeller: Rotol R3894123F25
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Engine
- Condition: Failed
- Location: Left
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/0302081

## Discrepancy

FLIGHT 4506 PIT-CRW. DURING CLIMB, CREW NOTICED THE LEFT ENGINE TORQUE FLUCTUATING +/- 30-40 PERCENT AT A POWER SETTING OF ABOUT 90-100 PERCENT.  ALSO HAD AN ERRATIC LEFT PROP RPM.  A SLIGHT YAW WAS FELT WHILE A MORE NOTICABLE ENGINE SURGE WAS HEARD.   ALL OTHER ENGINE INDICATIONS WERE NORMAL.  CREW DECLARED AN EMERGENCY AND STARTED THE RETURN TO PIT. CREW ENGAGED TORQUE MOTOR LOCK-OUT FOR THE LT ENGINE.  THE PROBLEM WENT AWAY AFTER TML ENGAGED.   AIRCRAFT RETURNED TO PIT SAFELY AND WAS TAKEN OUT OF SERVICE 2-8-03 AT 1355.  AIRCRAFT FERRIED TO FWA 2-9-03, ARRIVED AT 1313.

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