# SDR USAA2013030500001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 3, 2013
- Submitted: March 6, 2013
- Operation: Air carrier
- Aircraft: [N540UW](https://openairdocs.org/aircraft/N540UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 4107
- Aircraft time: 10,953 hours, 4,216 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Ptu
- Part number: 974014
- Part serial: 101C
- Condition: Failed
- Location: Hydraulic Sys
- Part time: 51,609 hours, 21,644 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAA2013030500001

## Discrepancy

THE AIRCRAFT LOST THE YELLOW HYDRAULIC SYSTEM AFTER RECEIVING A LOW LEVEL WARNING.  AN EMERGENCY WAS DECLARED AND THE FLIGHT LANDED WITHOUT INCIDENT.  REMOVED AND REPLACED YELLOW SYSTEM POWER TRANSFER UNIT IAW AIRBUS MAINTENANCE MANUAL 29-23-41-400-001-A.

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