# SDR NWAA 091513255

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 5, 2009
- Submitted: May 6, 2009
- Operation: Air carrier
- Aircraft: [N355NW](https://openairdocs.org/aircraft/N355NW), registered now
- Make and model: Airbus A320-212
- Registry model: [Airbus A320-212](https://openairdocs.org/model/airbus-industrie-a320-212) (OpenAirDocs)
- Aircraft serial: 807
- Aircraft time: 33,743 hours, 15,187 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: O-Ring
- Condition: Failed
- Location: Ptu
- Stage of operation: CR
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/NWAA%20091513255

## Discrepancy

DURING FLIGHT THE YELLOW HYDRAULIC SYSTEM QUANTITY WENT TO ZERO AND RECEIVED ECAM MESSAGE "HYD Y ENG PUMP LO PR", FOLLOWED COM AND TURNED OFF.  THE GREEN HYDRAULIC SYSTEM QUANTITY WAS LOW DURING FLIGHT.  DECLARED AN EMERGENCY, THE LANDING WAS UNEVENTFUL AND WAS TOWED TO THE GATE.  FOUND AND REPLACED AN O-RING BLOWN OUT ON PTU ON THE YELLOW SYSTEM AND REPLACED A SUCTION LINE COUPLING ON THE GREEN EDP THAT WAS LEAKING.

---
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.