# SDR AALA202109154564

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 14, 2021
- Submitted: September 15, 2021
- Operation: Air carrier
- Aircraft: [N164NN](https://openairdocs.org/aircraft/N164NN), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6909
- Aircraft time: 16,253 hours, 6,125 cycles
- System (JASC): [2611 · Smoke Detection](https://openairdocs.org/jasc/2611)
- Part: Smoke Warning
- Condition: False Activation
- Location: Lavatory
- Stage of operation: NR
- How discovered: 9
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202109154564

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: LAVATORY SMOKE ALARM ALERTED FOR 3 SECONDS. NO CAUSE FOUND STARBOARD AFT LAVATORY. REPLACED FILTERS IN BOTH AFT LAVATORIES SMOKE DETECTORS.

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