# SDR USAA2013122300010

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 22, 2013
- Submitted: December 23, 2013
- Operation: Air carrier
- Aircraft: N520UW
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 3924
- Aircraft time: 17,911 hours, 5,812 cycles
- System (JASC): [2611 · Smoke Detection](https://openairdocs.org/jasc/2611)
- Part: Filter
- Condition: Dirty
- Location: Smoke Detector
- Stage of operation: TX
- 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/USAA2013122300010

## Discrepancy

A SMOKE LAVATORY DETECTOR FAULT MESSAGE AFTER SHUTDOWN.  REPLACED ALL LAVATORY SMOKE DETECTOR FILTERS.  PERFORMED SDCU BITE TEST IAW AMM 26-10-00.  SYS TEST PASSED, NO MESSAGE AT THIS TIME.

---
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.