# SDR AUS20040155

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 3, 2004
- Submitted: June 4, 2004
- Operation: General aviation
- Make and model: Bell 412
- Registry model: [Bell 412](https://openairdocs.org/model/bell-412) (OpenAirDocs)
- Engine: Pwa PT6T3B
- System (JASC): [7921 · Engine Oil Cooler](https://openairdocs.org/jasc/7921)
- Part: Oil Cooler
- Part number: 8538100
- Condition: Leaking
- Location: Engine
- Stage of operation: LD
- How discovered: O
- Nature of condition: K, B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AUS20040155

## Discrepancy

(AUS) ENGINE/TRANSMISSION OIL COOLER INTERNAL LEAK. THE LEAK ALLOWED TRANSMISSION OIL TO ENTER THE COMBINING GEARBOX OIL SYSTEM UNDERPRESSURE AND OVERFILL THE COMBINING GEARBOX WHICH THEN VENTED THROUGH THE BREATHER.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.