# SDR 9901626641

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 25, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N641NW
- Make and model: Boeing 747 212B
- Registry model: [Boeing 747 212B](https://openairdocs.org/model/boeing-747-212b) (OpenAirDocs)
- Aircraft serial: 21941
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Valve
- Part number: AV16E12154
- Condition: Leaking
- Location: Nr 4 Hyd Syst
- Stage of operation: CL
- Nature of condition: K
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9901626641

## Discrepancy

DURING CLIMB, THE NR 4 HYDRAULIC SYSTEM LOW QUANTITY LIGHT ILLUMINATED.  AIRCRAFT RETURNED TO MSP AND LANDED WITHOUT INCIDENT.  REPLACED THE NR 4 HYDRAULIC SHUTOFF VALVE.  OPERATIONAL CHECK GOOD.

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