# SDR UPS07450142

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 10, 2007
- Submitted: July 11, 2007
- Operation: Air carrier
- Aircraft: N521UP
- Make and model: Boeing 747-200
- Registry model: [Boeing 747-200](https://openairdocs.org/model/boeing-747-200) (OpenAirDocs)
- Aircraft serial: 21944
- System (JASC): [3251 · Steering Unit](https://openairdocs.org/jasc/3251)
- Part: O-Ring
- Condition: Cut
- Location: Steering Sys
- Stage of operation: AP
- How discovered: O
- Nature of condition: K
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS07450142

## Discrepancy

INSPECTION TYPE:N/A HYDRAULIC SYSTEM NR 1 FLUID LOSS IN FLIGHT.  FOUND CUT O-RING ON LEFT NOSE WHEEL STEERING ACT TRANSFER TUBE.  REPLACED SEALS IAW 32-51-05.  OPS AND LEAK CHECKS GOOD DUE TO HYD FLUID LOSS.  NR 1 EDP REMOVED AND REPLACED IAW MM 29-11-05.  OPS AND LEAK CHECKS GOOD.  CASE DRAIN AND PRESS FILTERS REPLACED.  OPS AND LEAKS CHECK GOOD.

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