# SDR USAA2012102200024

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 19, 2012
- Submitted: October 22, 2012
- Operation: Air carrier
- Aircraft: [N538UW](https://openairdocs.org/aircraft/N538UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 4050
- Aircraft time: 10,426 hours, 3,866 cycles
- System (JASC): [5210 · Passenger/Crew Doors](https://openairdocs.org/jasc/5210)
- Part: Diaphragm
- Part number: FE240221001
- Part serial: NSN
- Condition: Leaking
- Location: L4 Bottle
- Stage of operation: IN
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAA2012102200024

## Discrepancy

MESSAGE ON CIDS PANEL TO CHECK DOOR 4L PRESSURE.  SERVICED DOOR 4L ASSIST BOTTLE.  DUE TO REPEATED SERVICINGS, COMPLETED ADDITIONAL TROUBLESHOOTING AND FOUND PERCUSSION DIAPHRAGM LEAKING.  REMOVED AND REPLACED DIAPHRAGM-SEALING IAW 52-11-05.

---
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, except the copies of manufacturers’ service documents, which belong to their rights holders.