# SDR DALA2020122304226

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 8, 2020
- Submitted: December 23, 2020
- Operation: Air carrier
- Aircraft: [N815NW](https://openairdocs.org/aircraft/N815NW), registered now
- Make and model: Airbus A330-323
- Registry model: [Airbus A330-323](https://openairdocs.org/model/airbus-a330-323) (OpenAirDocs)
- Aircraft serial: 0817
- Aircraft time: 59,643 hours, 7,862 cycles
- System (JASC): [3240 · Landing Gear Brake System](https://openairdocs.org/jasc/3240)
- Part: Selector Valve
- Condition: Failed
- Location: Brake System
- Stage of operation: TX
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2020122304226

## Discrepancy

ON TAXI OUT, THE BRAKES GRABBED AND STOPPED THE AIRCRAFT.  BRAKES AUTO BRK FAULT OCCURRED.  RECYCLED THE A/SKID AND N/W STRG SWITCH OFF/ON, PER THE QRH AND ATL MX.  CONTINUED SHORTLY AFTER RE-TAXIING, IN A TURN HAD NO BRAKE RESPONSE TO PILOT INPUT AND THE FAULT RE-OCCURRED.  THE BRAKES SELF ENGAGED AND THE AIRCRAFT STOPPED, SUBSEQUENTLY TOWED TO THE GATE.  CORRECTIVE ACTION: T/S PER A330 TSM 32-42.  FAULTS NORMAL BRAKE SELECTOR VALVE REMOVED AND REPLACED NORMAL BRAKE SELECTOR VALVE 4GG, PER AMM 32-42.  REMOVED BOTH ACCUM 5426G AND 5427GG, PER A330 AMM 32-44.  INSTALLED AND SERVICED BOTH BRAKE ACCUMULATORS, PER A330 AMM 32-44.  BLEED AND SERVICED THE ALT BRAKES MASTER CYLINDER RESERVOIR, PER A330 ALL 32-43.  R & R RT COCKPIT ALT BRAKE MASTER CYLINDER, PER A330 AMM 32-43.  R & R ALTN BRAKE MANIFOLD TRANSDUCER 3GK2, PER A330 AMM 32-44.  REPLACED ALTERNATE BRAKE DUAL VALVE, PER A330 AMM 32-43, BLED ALT HYD SYSTEM, PER A330 AMM 32-43.  ALT SYSTEM CHECKS OK, PRESSURIZED PARKING BRAKE ACCUMS, REF A330 AMM 12-14.  LEAK CHECKS GOOD.  RESET SAFETY VALVES, PER A330 AMM 32-42.  BLED BRAKE SYSTEM, PER A330 AMM 32-42.  NML AND AUX BRAKES CK OK.

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