# SDR 99ZZZX4079

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 15, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N487AL](https://openairdocs.org/aircraft/N487AL), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53204
- System (JASC): [6510 · Tail Rotor Drive Shaft](https://openairdocs.org/jasc/6510)
- Part: Disc Pack
- Part number: 406040340101
- Condition: Spread
- Location: T/R Drive
- 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/99ZZZX4079

## Discrepancy

FOUND NR 4 DISC  PACK SPREAD JUST BEYOND LIMITS DURING 25-HOUR INSPECTION.  FOUND NR 4 DISC PACK SPREAD BEYOND LIMITS. REMOVED NR 3 TAIL ROTOR DRIVESHAFT TO BLOWER SPLINE ADAPTER TO ENSURE IT STILL CONTAINED PROPER AMOUNT OF LUBRICANT.  IT DID, BUT FOUND THE SPLINE ADAPTER P/N 406-040-316-101 HAD A STEP WORN IN IT.  REPLACED THE SPLINE ADAPTER.

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