# SDR P5CA0401295

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 28, 2004
- Submitted: December 29, 2004
- Operation: Air carrier
- Aircraft: [N858FT](https://openairdocs.org/aircraft/N858FT), registered now
- Make and model: Boeing 747123
- Aircraft serial: 20109
- Aircraft time: 78,486 hours, 18,683 cycles
- System (JASC): [2913 · Hydraulic Pump (Electric/Engine), Main](https://openairdocs.org/jasc/2913)
- Part: Pump
- Part serial: MX5192
- Condition: Leaking
- Location: Nr 4 Engine
- Stage of operation: CL
- How discovered: O
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/P5CA0401295

## Discrepancy

NR 4 HYDRAULIC QUANTITY WENT TO ZERO IN CLIMB.  FOUND HYDRAULIC LEAK ON NR 4 ENG EDP.  REMOVED EDP AND INSTALLED HYDRAULIC PUMP FROM THE NR 3 ADP POSITION.  OPS AND LEAK CHECK OK.  NR 3 ADP DEACTIVATED PER MEL 29-2A.

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