# SDR AALA201912099005

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 2019
- Submitted: December 9, 2019
- Operation: Air carrier
- Aircraft: [N758US](https://openairdocs.org/aircraft/N758US), registered now
- Make and model: Airbus A319-112
- Registry model: [Airbus A319-112](https://openairdocs.org/model/airbus-industrie-a319-112) (OpenAirDocs)
- Aircraft serial: 1348
- Aircraft time: 49,252 hours, 32,512 cycles
- System (JASC): [3240 · Landing Gear Brake System](https://openairdocs.org/jasc/3240)
- Part: Tachometer
- Part number: C20105000
- Part serial: 10963
- Condition: Faulty
- Location: Brake System
- Part time: 49,255 hours, 32,515 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: S
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201912099005

## Discrepancy

AIRCRAFT WAS GROUNDED: PILOT REPORTS AFTER LANDING ON TAXI IN EXTREME BRAKE PULSING WHEN BRAKES APPLIED. TURNED OFF ANTI-SKID & AIRCRAFT TOOK A HARD RIGHT TURN , SWBACK TO NORMAL, & AGAIN, EXTREME PULSING. MAINTENANCE PERFORMED TROUBLESHOOTING IAW TSM 32-40-00-810-912-A. REMOVED & INSPECTED #3 TACHOMETER IAW AMM 32-42-68. INSTALLED & OPS TEST OK. REMOVED & REPLACED #4 TACHOMETER & OUTERSHELL IAW AMM 32-42-57. PERFORMED OPS OF #4 TACHOMETER IAW AMM 32-42-00, OPS TEST GOOD. BLED BRAKE SYSTEM IAW AMM 32-42-00. PERFORMED TAXI CHECK. NO DEFECTS NOTED.

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