# SDR U2RA202603090001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 4, 2026
- Submitted: March 9, 2026
- Operation: Air carrier
- Aircraft: [N756CA](https://openairdocs.org/aircraft/N756CA), registered now
- Make and model: Boeing 747446
- Aircraft serial: 25068
- Aircraft time: 99,802 hours, 16,214 cycles
- Engine: Ge CF680C
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Hydraulic Line
- Part number: 270U0018102
- Condition: Cracked
- Location: Zone 400
- Part time: 99,802 hours
- Stage of operation: CR
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/U2RA202603090001

## Discrepancy

APPROXIMATELY 30 MINUTES AFTER TOP OF CLIMB, CRUSING AT FLIGHT LEVEL 34,000, EICAS MESSAGE "HYD QTY LOW 1" QUANTITY OBSERVED DECREASING REPIDLY ON HYD SYNOPTIC PAGE.  SHORTLY AFTER, QUANTITY AT 0.00.  EICAS "HYD PRESS SYS 1". NON NORMAL CHECKLIST ACTIONED. - REPAIRED HYDRAULIC TUBE IN NUMBER 1 ENGINE PYLON.

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