# SDR CA980825016

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 11, 1998
- Submitted: March 26, 2000
- Operation: Air carrier
- Make and model: Snias AS350BA
- Engine: Tmeca ARRIEL1B
- System (JASC): [6520 · Tail Rotor Gearbox](https://openairdocs.org/jasc/6520)
- Part: Cover
- Part number: 350A33101120
- Condition: Cracked
- Location: T/R Gearbox
- Part time: 7,657 hours
- Component: Aerosp, 350A33020004
- Stage of operation: LD
- Nature of condition: E, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA980825016

## Discrepancy

(CAN) AFTER LANDING, AS M/R RPM DECREASING THROUGH 300 RPM, UNUSUAL TAIL ROTOR VIBRATION FOLLOWED BY T/R CHIP LIGHT.  T/R GEARBOX CHANGED.  OIL DRAINED FROM GEARBOX CONTAINED MINUTE AMOUNT OF FERROUS AND A LOT OF NON-FERROUS METAL PARTICLES.  DISASSEMBLY REVEALED CRACK IN COVER ADJACENT TO ROLLER BEARING OUTER RACE AND THROUGH OIL GALLERY.

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