# SDR 97ZZZX1137

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 6, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N4035W](https://openairdocs.org/aircraft/N4035W), registered now
- Make and model: Snias AS350B
- Aircraft serial: 2912
- System (JASC): [6310 · Engine/Transmission Coupling](https://openairdocs.org/jasc/6310)
- Part: Freewheel Shaft
- Condition: Extra O Ring
- Location: Eng Power Shaft
- Part time: 199 hours
- 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/97ZZZX1137

## Discrepancy

DURING REPLACEMENT OF MODULE I MAG ASSEMBLY, DISCOVERED AN O-RING ON POWER SHAFT BETWEEN FREEWHEEL UNIT AND MAG SEALING RING HOLDER.  THIS PARTICULAR MODEL ENGINE DOES NOT USE AN O-RING IN THIS LOCATION.  THE PRESENCE OF THIS O-RING COULD RESTRICT SOME FLOW OF OIL TO THE FREEWHEEL UNIT.  THIS COMPONENT WAS NEVER WORKED ON BEFORE THIS SEAL REPLACEMENT.  DEFECT WAS PROBABLY DONE DURING ASSEMBLY BY MANUFACTURER.

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