# SDR DXTA2010120204340

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 30, 2010
- Submitted: December 2, 2010
- Operation: Air carrier
- Aircraft: [N139QS](https://openairdocs.org/aircraft/N139QS), registered now
- Make and model: Raythn 400ARAYTHEON
- Aircraft serial: RK483
- Aircraft time: 1,781 hours, 1,696 cycles
- Engine: Pwa JT15D5
- System (JASC): [3240 · Landing Gear Brake System](https://openairdocs.org/jasc/3240)
- Part: Mixing Valve
- Part number: C100169
- Part serial: 1255A
- Condition: Malfunctioned
- Location: Brakes
- Part time: 1,781 hours, 1,696 cycles
- Stage of operation: LD
- How discovered: O
- Nature of condition: S
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2010120204340

## Discrepancy

DURING LANDING ROLLOUT COPILOT BRAKES PERFORMED ABNORMALLY; SEVERAL PUMPS REGAINED PRESSURE. DURING TAXI STEADY BRAKING RESULTED IN DECREASING PRESSURE WITH LT PEDAL REACHING FLOOR.  REPLACED LEFT MIXER VALVE IAW MM 32-40-00.  OPS AND LEAK CHECKED GOOD.

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