# SDR UALA2012011900397

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 19, 2012
- Submitted: January 24, 2012
- Operation: Air carrier
- Aircraft: [N122UA](https://openairdocs.org/aircraft/N122UA), registered now
- Make and model: Boeing 747422
- Aircraft serial: 29168
- Aircraft time: 52,104 hours, 6,181 cycles
- Engine: Pwa PW4056
- System (JASC): [2611 · Smoke Detection](https://openairdocs.org/jasc/2611)
- Part: Smoke Detector
- Part number: PU90461R3
- Condition: Faulty
- Location: Lavatory
- Stage of operation: IN
- How discovered: O
- Nature of condition: N
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2012011900397

## Discrepancy

LAV 111 SMOKE DETECTOR SOUNDED WITH NO SMOKE.  NO GREEN LT ILLUM STOPPED SOUND BUT AGAIN.  RPLD SMOKE DETECTOR PER MM 26-13-01 P401 AND TEST OK.  TEST PER MM 26-13-00.  CHKD AND FOUND NO FIRE, NO SMOKE IN LAV 111.

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