# SDR DXTA200601617

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 26, 2006
- Submitted: October 4, 2006
- Operation: Air carrier
- Aircraft: [N123QS](https://openairdocs.org/aircraft/N123QS), registered now
- Make and model: Beech 400A
- Registry model: [Beech 400A](https://openairdocs.org/model/hawker-beechcraft-400a) (OpenAirDocs)
- Aircraft serial: RK486
- Aircraft time: 20 hours, 15 cycles
- System (JASC): [3241 · Brake Anti-Skid Section](https://openairdocs.org/jasc/3241)
- Part: Mixing Valve
- Part number: C100169
- Part serial: 1265A
- Condition: Faulty
- Location: Mlg Brakes
- Part time: 20 hours, 15 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: G, J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA200601617

## Discrepancy

ON TAXI OUT, CO-PILOTS BRAKE FAILED.  INITIALLY HARD BRAKES WITH NO BRAKING.  RIGHT PEDAL WENT TO FLOOR, THEN WITH 3 PUMPS, HAD BRAKES, BUT A/C SHUTTERED TO A STOP WITH SEVERE RUMBLE NOTICED.  GAINED ACCESS TO BRAKE MIXING VALVES.  REMOVED FAULTY RT MIXING VALVE P/N C100169, S/N 1265A.  INSTALLED NEW MIXING VALVE P/N C100169, S/N 1296A.  BLED BRAKES NUMEROUS TIMES IAW HAWKER 400XP MM CHAPTER 32-40-00.  REINSTALLED ALL PANELS AND PARTS REQUIRED TO BE REMOVED.  REFERENCING 400XP MM CHAPTERS 06-50-00, 20-00-00 & 25-11-00.  OPS/ LEAK CHECK C/W.  BOTH CHECK GOOD.

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