# SDR WRNA201200003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 13, 2012
- Submitted: April 16, 2012
- Operation: Air carrier
- Aircraft: N953AR
- Make and model: Doug MD-11F
- Registry model: [Doug MD-11F](https://openairdocs.org/model/mcdonnell-douglas-md-11f) (OpenAirDocs)
- Aircraft serial: 48520
- Aircraft time: 58,223 hours, 14,952 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: O-Ring
- Part number: NAS1611210
- Condition: Cut
- Location: Hyydraulic Sys
- Component: Filter Module
- Component part number: ASG05275001
- Stage of operation: CR
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/WRNA201200003

## Discrepancy

DURING CRUISE, CREW NOTICED AMBER ALERT LEVEL 1 HYD QTY SYS 1, QTY GOING LOWER.  A/C DIVERTED TO CCS.  LANDING NORMAL.  MX FOUND O-RING CUT AND SQUEEZED OUT ON NR 1 EDP LOW PRESSURE SWITCH.  REMOVED AND REPLACED O-RING IAW 29-12-34.  SERVICED NR 1 HYD SYS IAW 12-13-02, RUN UP AND LEAK CHECK GOOD IAW 29-00-00.  A/C RETURNED TO SERVICE.

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