# SDR AALA202604083148

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 4, 2026
- Submitted: April 8, 2026
- Operation: Air carrier
- Aircraft: [N509AY](https://openairdocs.org/aircraft/N509AY), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 3796
- Aircraft time: 57,262 hours, 21,792 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Ptu
- Part number: 971600
- Part serial: MX629278
- Condition: Leaking
- Location: Zone 100
- Part time: 66,414 hours, 39,708 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202604083148

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO MIA DUE TO THE FLIGHT CREW REPORTING THAT INFLIGHT HAD YELLOW HYDRAULIC RESERVOIR GO TO ZERO. COMPLIED WITH ECAM. THE AIRCRAFT LANDED SAFELY AT MIA WHERE IT TOWED TO THE GATE. MAINTENANCE ISOLATED THE SOURCE OF THE LEAK TO THE PTU AND PRESSURE LINE FRANGIBLE FITTING, MAINTENANCE REPLACED THE PTU (AALA202604084859) AND THE PRESSURE LINE (AALA202604082721). A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ISSUES NOTED.

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