# SDR 98UAL900191

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 11, 1998
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N179UA
- Make and model: Boeing 747422
- Aircraft serial: 25158
- Engine: Pwa PW4056
- System (JASC): [7230 · Turbine Engine Compressor Section](https://openairdocs.org/jasc/7230)
- Part: Engine
- Condition: Stalled
- Location: Nr 1
- Stage of operation: IN
- Nature of condition: Y
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/98UAL900191

## Discrepancy

AFTER FIRST 3 ENGINES WERE STARTED NR 1 ENGINE DID AN AUTO SHUTDOWN.  *S/D*  FLIGHT DATA RECORDER INFORMATION INDICATES THE NUMBER 1 ENGINE EXPERIENCED AN OFF-IDLE STALL WHICH PREVENTED THE ENGINE FROM REACHING STABILIZED IDLE.  THE ENGINE SLOWLY DECELERATED TO A SUB IDLE CONDITION WHICH RESULTED IN ENGINE FLAME-OUT AND TAILPIPE FIRE.  INSTALLED A ELECTRONIC ENGINE CONTROL WITH UP-GRADED SOFTWARE DESIGNED TO ALLEVIATE OFF-IDLE STALLS.

---
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.