# SDR AALA202601059757

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 25, 2025
- Submitted: January 5, 2026
- Operation: Air carrier
- Aircraft: [N173US](https://openairdocs.org/aircraft/N173US), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 1481
- Aircraft time: 79,710 hours, 30,857 cycles
- System (JASC): [3240 · Landing Gear Brake System](https://openairdocs.org/jasc/3240)
- Part: Harness
- Condition: Fault Message
- Location: Zone 700
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: A, O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202601059757

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO IAD DUE TO THE FLIGHT CREW REPORTING ECAM MESSAGES FOR BRAKES-AUTO BRAKE FAULT AND BRAKE RELEASED. THE AIRCRAFT LANDED SAFELY AT IAD WITHOUT FURTHER INCIDENT. **ORIGINAL REPORT WAS AALA202512297475 SUBMITTED ON 12/29/2025 BY TUL: MAINTENANCE REPLACED THE #2 WHEEL TACHOMETER 21GG, #2 WHEEL TACHOMETER DRIVE SHAFT (AALA202601057381), AXLE HARNESS 1M (AALA202601059757) AND THE BRAKE STEERING CONTROL UNIT (AALA202601052776). A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO DEFECTS OR FAULTS NOTED.

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