# SDR FDEA2019062421401

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 22, 2019
- Submitted: June 24, 2019
- Operation: Air carrier
- Aircraft: [N617FE](https://openairdocs.org/aircraft/N617FE), registered now
- Make and model: Doug MD-11F
- Registry model: [Doug MD-11F](https://openairdocs.org/model/mcdonnell-douglas-md-11f) (OpenAirDocs)
- Aircraft serial: 48748
- Aircraft time: 73,583 hours, 18,223 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Check Valve
- Part number: 4C9188
- Condition: Leaking
- Location: Hyd System
- Stage of operation: DE
- 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/FDEA2019062421401

## Discrepancy

APPROX. 1 HOUR INTO FLIGHT LEVEL 1 HYD EIU 3 OFF  ALERT.  HYD QTY 3.2.  HYD QTY CONTINUED TO DECREASE  TO 2.5 LEVEL 1 HYD 3 OFF.  QTY THEN HELD SEADY AT  2.5.   AT SLAT EXNTENSION, QTY IMMEDIATLY DROPPED  AND RECIEVED LEVEL 2 HYD FAIL ALERT.  QTY WENT TO  NEAR 0.   REMOVED AND REPLACED THE CHECK VALVE THAT WAS  LEAKING ON THE UPPER HYD TRIM VALVE  PER M/M 27-43-41-4-0. PERFORMED LEAK CHECK ON VALVE AND ALL SYSTEM ARE GOOD.  THE ORING WAS FOUND TO BE SPLIT ON OLD CHECK VALVE.

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