# SDR AALA202601125153

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 10, 2026
- Submitted: January 12, 2026
- Operation: Air carrier
- Aircraft: [N191UW](https://openairdocs.org/aircraft/N191UW), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 1447
- Aircraft time: 79,031 hours, 30,770 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Union
- Part number: MS21902D8
- Condition: Sheared
- Location: Zone 100
- Stage of operation: AP
- 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/AALA202601125153

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED ON FINAL APPROACH INTO DFW DUE TO THE FLIGHT CREW REPORTING THAT AFTER LOWERING THE GEAR A YELLOW HYDRAULIC SYSTEM RESERVOIR LOW LEVEL ECAM MESSAGE DISPLAYED AND THAT ALL HYDRAULIC FLUID WAS LOST FOR THE YELLOW SYSTEM. THE AIRCRAFT LANDED SAFELY AT DFW AND TAXIED TO THE GATE UNDER ITS OWN POWER. MAINTENANCE FOUND THE ALTERNATE BRAKE DUAL DISTRIBUTION VALVE HAD A SHEARED UNION AND REPLACED IT PER AMM 32-43-14. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.

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