# SDR 98ZZZX3096

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 13, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N437AL](https://openairdocs.org/aircraft/N437AL), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53141
- Engine: Allsn 250C47B
- System (JASC): [7313 · Fuel Injector Nozzle](https://openairdocs.org/jasc/7313)
- Part: Nozzle
- Part number: 6899001E
- Condition: Failed
- Location: Combustion Sect
- Part time: 511 hours
- Component: 23063354
- 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/98ZZZX3096

## Discrepancy

TURBINE AND FUEL NOZZLE SENT TO SHOP FOR ENGINE MAKING METAL.  REMOVED FUEL NOZZLE FROM COMBUSTION SECTION AND FOUND HEAVY CARBON BUILD-UP ON BOTTOM OF SHROUD HOUSING AND ALSO CARBON BUILD-UP INSIDE COMBUSTION LINER.  FUEL NOZZLE WAS SHIMMED AT .341 INCH.  CARBON BUILD-UP SEEMS TO BE CAUSED BY SMOKELESS LINERS.

---
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.