# SDR CALA2016092095754

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 18, 2016
- Submitted: September 20, 2016
- Operation: Air carrier
- Aircraft: [N840UA](https://openairdocs.org/aircraft/N840UA), registered now
- Make and model: Airbus A319-131
- Registry model: [Airbus A319-131](https://openairdocs.org/model/airbus-industrie-a319-131) (OpenAirDocs)
- Aircraft serial: 1522
- Aircraft time: 50,877 hours, 21,412 cycles
- Engine: Iae V2522A5
- System (JASC): [3240 · Landing Gear Brake System](https://openairdocs.org/jasc/3240)
- Part: Selector Valve
- Condition: Malfunctioned
- Location: Brakes
- 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/CALA2016092095754

## Discrepancy

AIRCRAFT EXCURSION FROM TAXIWAY. CREW REPORTED LOSS OF BRAKES AND STEERING.   PFR SHOWS BRAKE SELECTOR VALVE 23GG FAULT ALONG WITH MLG HYDRAULIC PIPE MESSAGE. TEST RUN ON BSCU CHANNEL 1 & 2. BSCU CHAN 1 LAST LEG REPORT - "BRK SELECTOR VALVE (23GG)/L G HYDRAULIC PIPE". LRU WIRING & BSCU TEST - "NO FAULT DETECTED". NORMAL BRAKING TEST - "NO FAULT DETECTED". GROUND SCAN - "NO FAULT DETECTED". SUSPECT 23GG VALVE IS LEAKING INTERNALLY, REPLACED SAME. PHASE 1 CHECKS, NO DAMAGE NOTED.

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