# SDR 2005F00049

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 21, 2005
- Submitted: March 15, 2005
- Operation: Air carrier
- Aircraft: N69AL
- Make and model: Bell 206L-4
- Registry model: [Bell 206L-4](https://openairdocs.org/model/bell-helicopter-textron-canada-206l-4) (OpenAirDocs)
- Aircraft serial: 52139
- Engine: Allsn 250C30P
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Engine
- Condition: Malfunctioned
- Stage of operation: TO
- How discovered: O
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2005F00049

## Discrepancy

DURING TAKEOFF, WITH POWER ABOVE 80 PERCENT TORQUE AIRCRAFT BEGINS VIBRATIONS INCREASING TO SEVERE WITH OSCILLATION BETWEEN 20-30 PERCENT ON TORQUE GAUGE.  MAINTENANCE REMOVED AND REPLACED ENGINE ASSY WITH SERVICABLE SERIAL NUMBER CAE-890158.  WORK DONE IAW BELL 206L-4 AND ROLLS ROYCE MAINTENANCE MANUALS.  COMPLIED WITH OPS CHECK FLIGHT, PLUS 8 ON BELL POWER CHECK NO OTHER DEFECTS NOTED.  (M)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.