# SDR CALA2026030214208

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 26, 2026
- Submitted: March 2, 2026
- Operation: Air carrier
- Aircraft: [N831UA](https://openairdocs.org/aircraft/N831UA), registered now
- Make and model: Airbus A319-131
- Registry model: [Airbus A319-131](https://openairdocs.org/model/airbus-industrie-a319-131) (OpenAirDocs)
- Aircraft serial: 1291
- Aircraft time: 75,852 hours, 33,688 cycles
- System (JASC): [3297 · Landing Gear System Wiring](https://openairdocs.org/jasc/3297)
- Part: Wire
- Condition: Shorted
- Location: Zone 700
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026030214208

## Discrepancy

BRAKES ECAM,  AUTO BRAKE FAULT BRAKE.   PERFORMED OPERATINAL CHECK AND INSPECTION ON THE BRAKE 3 AND 4. PISTONS ARE MOVING WHILE PRESSING BRAKES. PERFORMED BITE TEST ON BSCU IAW TASK 32-46-00-740-001-A. CHAN 1 AND CHAN 2 NORMAL BRAKING TEST SHOWS TACHOMETER3 (20GG ) MIGHT BE THE PROBLEM. FURTHER TROUBLESHOOTING REQUIRED. REMOVED AND REPLACED #3 BRAKE TACHOMETER.  NO HELP AFTER OPS CHECK.  SUSPECT WIRING PROBLEM REMOVED NR 3 AND NR 4 HUBCAPS FOR TROUBLESHOOT WHILE T/SING,  FOUND SHORT FROM 7J (10GG BSCU)-- C (20GG TACH WHEEL 3). DEPINNED, INSPECTED PIN AND CRIMP. LOOKS GOOD. REPINNED. SUSPECT PROBLEM AT JUNCTION BOX, LOCATED RIGHT ABOVE WHEEL. IAW ASM 32-42-02 SCH 02, PAGE 35. T/S PER FIM 32-42-00-810-821-A.  PERFORMED WIRING CHECKS AND FOUND TERMINAL BLOCK 1833VT POSITION (46) AT FAULT.  R & R TB 1833VT, POSITION (46) REF. AWM 32-42-07.  OPS CHECK IS GOOD. PERFORMED BSCU SYSTEM CHECK FOR CH.1 AND CH.2, SYSTEM TEST GOOD,  GROUND SCAN GOOD.  NO DEFECTS NOTED.  LAND TEST ACCOMPLISHED, LAND TEST IS GOOD, AIRCRAFT REMAINS FULL CAT CAPABLE.

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