# SDR 96ZZZX1627

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 16, 1996
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N331CW](https://openairdocs.org/aircraft/N331CW), registered now
- Make and model: Israel 1124
- Registry model: [Israel 1124](https://openairdocs.org/model/israel-aircraft-industries-1124) (OpenAirDocs)
- Aircraft serial: 231
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: O-Ring
- Part number: NAS161204
- Condition: Failed
- Location: Equip Bay Aft
- Part time: 5,168 hours
- Stage of operation: CR
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX1627

## Discrepancy

AT 1 PLUS 30 INTO A FLIGHT, ESTABLISHED IN CRUISE, THE LT HYD LOW PRESS ANNUNCIATOR ILLUMINATED.  THIS WAS SUBSEQUENTLY FOLLOWED BY A RT HYD LOW PRESS ANNUNCIATOR LIGHT.  THE MAIN SYS PRESS GAUGE INDICATED A 'ZERO'.  A NORMAL LANDING WAS MADE USING BACK-UP SYSTEMS FOR LANDING GEAR BRAKES, THRUST REVERSERS, AND FLAPS.  LANDING WAS MADE AT JAX.  AN O-RING SEAL, LOCATED ON A FITTING SITUATED BETWEEN THE MAIN SYS HYD SYS FILTER (AFT), AND A CHECK VALVE, FAILED.  REASON FOR FAILURE UNKNOWN.  THIS ALLOWED ALL PRIMARY HYD SYS FLUID TO BLEED FROM SYS.  THE O-RING WAS REPLACED, SYS SERVICED, AND ACFT RETURNED TO SERVICE.

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