# SDR H44A202501070001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 17, 2024
- Submitted: January 7, 2025
- Operation: Air carrier
- Aircraft: [N401TD](https://openairdocs.org/aircraft/N401TD), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 54335
- Aircraft time: 8,633 hours, 4,623 cycles
- Engine: Allsn 250C47B
- Engine time: 4,102 hours, 4,623 cycles
- System (JASC): [7261 · Turbine Engine Oil System](https://openairdocs.org/jasc/7261)
- Part: Seal
- Part number: 23079072
- Condition: Failed
- Location: Pto
- Stage of operation: CR
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/H44A202501070001

## Discrepancy

PILOT REPORTED INCREASE IN ENGINE OIL PRESSURE AND DECREASE IN TRANSMISSION PRESSURE. UPON FURTHER INSPECTION IT WAS DISCOVERED THAT THE NEWLY INSTALLED PTO SEALS FAILED.

---
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.