# SDR 2002UALA01302

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 12, 2002
- Submitted: September 24, 2002
- Operation: Air carrier
- Aircraft: [N793UA](https://openairdocs.org/aircraft/N793UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26946
- Aircraft time: 22,226 hours, 3,524 cycles
- Engine: Pwa PW4090
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Circuit Card
- Part number: 47348707
- Part serial: 1403
- Condition: Faulty
- Location: Fire Warning
- Stage of operation: CR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2002UALA01302

## Discrepancy

INTERMITTENT PROBLEM WITH LEFT ENGINE FIRE DETECTION SYSTEM.  THE NR 1 ENGINE OVERHEAT MESSAGE WAS A FALSE INDICATION.  BOTH OF THE NR 1 ENGINE FIRE LOOPS WERE INSPECTED AND OPS CK'D WITH NO DISCREPANCIES FOUND.  DUE TO LEFT CARD FAULT INDICATION FROM CMC, THE NR 1 ENGINE FIRE DETECTION CARD WAS REPLACED.

---
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.