# SDR HSYA201202121

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 12, 2012
- Submitted: February 14, 2012
- Operation: Air carrier
- Aircraft: N319BH
- Make and model: Beech 1900C
- Registry model: [Beech 1900C](https://openairdocs.org/model/beech-1900c) (OpenAirDocs)
- Aircraft serial: UB36
- Aircraft time: 25,598 hours, 35,501 cycles
- Engine: Pwa PT6A65B
- Engine time: 24,463 hours, 37,282 cycles
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Engine
- Condition: Failed
- Location: Nr 1
- Stage of operation: CL
- How discovered: O
- Nature of condition: E, R, J
- Precautionary procedure: E, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HSYA201202121

## Discrepancy

DURING CLIMB OUT FOR A STAGING FLIGHT, CREW PULLED THROTTLE BACK AT APPROX 4000 FT,  NR 1 ENGINE MADE A POPPING NOISE, FOLLOWED BY TORQUE DECREASING TO 2100 FT LBS, FOLLOWED BY AN ADDITIONAL POPPING NOISE FROM THE NR 1 ENGINE.  THE CREW PULLED THE POWER ON THE NR 1 ENGINE TO IDLE, DECLARED AN EMERGENCY, RETURNED AND LANDED WITHOUT FURTHER INCIDENT.  DURING SHUTDOWN, CREW HEARD A GRINDING NOISE FROM NR 1 ENGINE AND FELT SLIGHT VIBRATION IN CONTROL YOKE.   INSPECTION REVEALED SEVERAL COMPRESSOR BLADES WITH CURL-UP AND SHARP EDGES. ALSO COMPRESSOR SECTION DID NOT ROTATE FREELY WITH ACCESORIES REMOVED AND AN OCCASIONAL GRINDING NOISE WAS HEARD DURING ROTATION. OPEN

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