# SDR 99ZZZX896

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 26, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N427AL
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53107
- System (JASC): [6420 · Tail Rotor Head](https://openairdocs.org/jasc/6420)
- Part: Bearing
- Part number: 406312100101
- Condition: Worn
- Location: Tail Rotor
- Part time: 1,284 hours
- Component: 407012101107
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX896

## Discrepancy

TAIL ROTOR ASSEMBLY WAS REMOVED FOR WORN BEARINGS.  FOUND THE TWO INBOARD BEARINGS BADLY WORN. THE OUTER RACE LINERS DEBONDED.  THREE T/R HUBS HAVE BEEN FOUND IN THIS CONDITION.  BEARING KEPT FOR POSSIBLE EVALUATION.  RECOMMEND:  REMOVE T/R BLADES AND INSPECT INBOARD BEARINGS EVERY 800 HOURS.  REPLACED TWO EACH BEARINGS.

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