# SDR AALA202601065111

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 5, 2026
- Submitted: January 6, 2026
- Operation: Air carrier
- Aircraft: [N178US](https://openairdocs.org/aircraft/N178US), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 1519
- Aircraft time: 77,979 hours, 30,329 cycles
- System (JASC): [2611 · Smoke Detection](https://openairdocs.org/jasc/2611)
- Part: Smoke Detector
- Condition: False Activation
- Location: Zone 900
- Stage of operation: NR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202601065111

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: FLIGHT ATTENDANT REPORTED THAT AFT RIGHT LAVATORY SMOKE ALARM STARTED TO BEEP ONCE EVERY TWO SECONDS AND THE LIGHT CAME ON. NO INDICATIONS ON THE FLIGHT DECK. THE LAVATORY WAS EMPTY. AFTER ABOUT 5 MINUTES THE BEEPING STOPPED AND THE LIGHT WENT OUT. MAINTENANCE ACCOMPLISHED SMOKE DETECTOR CONTROL UNIT BITE TEST PER AMM 26-07-00 AND BITE TEST PASSED FOR ALL LAVATORIES,

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