# SDR UPS07449578

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 29, 2007
- Submitted: March 30, 2007
- Operation: Air carrier
- Aircraft: N683UP
- Make and model: Boeing 747121
- Aircraft serial: 20353
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Module
- Condition: Unknown
- Location: Nr 3 Hyd System
- Stage of operation: NR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS07449578

## Discrepancy

HYD SYSTEM 3 FAILURE PRESSURE & QUANTITY ZERO DURING FLAP RETRACTION.  HYD SYSTEM PR & QT LIGHTS ON.  REMOVED AND REPLACED MODULAR ASSY & LEAK CHECK IAW 29-11-23.

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