# SDR 2006UALA02082

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 26, 2006
- Submitted: October 31, 2006
- Operation: Air carrier
- Aircraft: [N792UA](https://openairdocs.org/aircraft/N792UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26934
- Aircraft time: 40,737 hours, 6,172 cycles
- Engine: Pwa PW4090
- Engine time: 12,543 hours, 9,382 cycles
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Blade
- Condition: Failed
- Location: Apu Engine
- Stage of operation: NR
- How discovered: O
- Nature of condition: A
- Precautionary procedure: F, E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2006UALA02082

## Discrepancy

DURING ENG START APU SHUTDOWN WITH FAULT LIGHT ON.  REPORTS OF LOUD BANG AND FIRE WITH SPARKS COMING OUT OF APU EXHAUST AREA.  APU FIRE BOTTLE WAS DISCHARGED.  T1 BLADE FAILURE (SULFIDATION).

---
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.