# SDR QMLA2017100717103

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 7, 2017
- Submitted: October 11, 2017
- Operation: Air carrier
- Aircraft: [N712GA](https://openairdocs.org/aircraft/N712GA), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 54084
- Aircraft time: 4,477 hours, 9,230 cycles
- System (JASC): [6500 · Tail Rotor Drive System](https://openairdocs.org/jasc/6500)
- Part: Bearing
- Condition: Damaged
- Location: Tail Rotor
- Part time: 4,477 hours, 9,230 cycles
- Stage of operation: LD
- How discovered: O
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QMLA2017100717103

## Discrepancy

AFTER LANDING AND DURING ENGINE SHUT DOWN THERE WAS A PRONOUNCED VIBRATION.  AFTER SHUT DOWN THERE WAS ENGINE OIL RUNNING OUT OF THE ENGINE OIL TANK.  MAINTENANCE FOUND A CRACK IN THE ENGINE OIL TANK DRAIN VALVE BOSS WELD.  UPON FURTHER INVESTIGATION ONE OF THE TAIL ROTOR ELASTOMERIC BEARINGS WAS FOUND TO BE SEPARATED.

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