# SDR 2000ZZZX88

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 3, 2000
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N5008N
- Make and model: Bell 206B
- Registry model: [Bell 206B](https://openairdocs.org/model/bell-206b) (OpenAirDocs)
- Aircraft serial: 2518
- System (JASC): [6420 · Tail Rotor Head](https://openairdocs.org/jasc/6420)
- Part: Plug
- Part number: 206011810153
- Condition: Mismanufactured
- Location: T/R Hub
- Part time: 414 hours
- Component: 206011862101
- Stage of operation: IN
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2000ZZZX88

## Discrepancy

SUSPECT COMPOSIT THRUST PLUGS WERE MISMANUFACTURED OR IMPROPERLY INSTALLED ALLOWING TRUNNION TO SHIFT.  THIS CAUSED AN OUT-OF-BALANCE CONDITION.  THE TAIL ROTOR HUB AND BLADE ASSEMBLY WAS DYNAMICALLY BALANCED ON SEVERAL OCCASIONS.  EACH TIME THE TAIL ROTOR VIBRATION WOULD RETURN WITHIN A FEW FLIGHT HOURS.  THE TAIL ROTOR ASSEMBLY WAS REMOVED FROM SERVICE DISASSEMBLED AND THE PROBLEM IDENTIFIED.  UPON ASSEMBLY, BELL REQUIRES A .002 TO .004 THOUSANDTHS PINCH FIT.  THIS ASSEMBLY LOST ALL PRELOAD AND DUE TO THRUST PLUG WIRE HAD A LOOSE FIT OF .004 THOUSANDTHS.

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