# SDR DXTA2010080204184

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 1, 2010
- Submitted: August 2, 2010
- Operation: Air carrier
- Aircraft: [N914QS](https://openairdocs.org/aircraft/N914QS), registered now
- Make and model: Cessna 750
- Registry model: [Cessna 750](https://openairdocs.org/model/cessna-750) (OpenAirDocs)
- Aircraft serial: 7500296
- Aircraft time: 1,194 hours, 742 cycles
- Engine: Allsn AE3007C
- System (JASC): [1810 · Helicopter Vibration Analysis](https://openairdocs.org/jasc/1810)
- Part: Monitor
- Part number: 2787
- Part serial: 120759
- Condition: Inoperative
- Location: Eng Vibration
- Part time: 1,194 hours, 742 cycles
- Stage of operation: DE
- How discovered: O
- Nature of condition: E, J
- Precautionary procedure: E, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2010080204184

## Discrepancy

DURING OUR DESCENT, AT ABOUT FL 330, RECEIVED AN AMBER CAS "LT ENGINE VIBRATION" MESSAGE.  FOLLOWED CHECK LIST. AFTER A MIN THE CASE MESSAGE WENT OUT AND CAME BACK ON SEVERAL TIMES AND RECEIVED THE RED MASTER WARNING LIGHT "LT ENGINE VIBRATION".  AGAIN, FOLLOWED THE CHECK LIST. AS A PRECAUTION SHUT THE LT ENGINE DOWN.  BORESCOPED LT ENGINE, NO DEFECTS NOTED. TOOK FUEL SOAP SAMPLE AS WELL IAW MFG REP.  REPLACED ENGINE VIBE MONITORING UNIT IAW MM 77-41-10 AND ENG ACCELEROMETER IAW 77-30-00, OPS CHECK GOOD.

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