# SDR NWAA073855639

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 25, 2007
- Submitted: November 29, 2007
- Operation: Air carrier
- Aircraft: [N539US](https://openairdocs.org/aircraft/N539US), registered now
- Make and model: Boeing 757251
- Aircraft serial: 26486
- Aircraft time: 35,199 hours, 13,811 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: O-Ring
- Condition: Leaking
- Location: Hyd System
- Stage of operation: NR
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/NWAA073855639

## Discrepancy

DURING FLIGHT THERE WAS A LEFT HYDRAULIC FAILURE LOSS OF FLUID FOLLOWED BY PRESSURE LOSS AFTER PTU FAILED.  FLIGHT CONTINUED ON TO NGO.  EMERGENCY WAS DECLARED AND LANDING WAS UNEVENTFUL, RUNWAY WAS CLOSED FOR 10 MINUTES, A/C HAD TO BE TOWED OFF OF RUNWAY.  MAINTENANCE REMOVED AND REPLACED A LEAKING O-RING.  OPERATIONAL CHECKED GOOD AND AIRCRAFT WAS RETURNED TO SERVICE.

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