# SDR DXTA2009120703882

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 6, 2009
- Submitted: December 7, 2009
- Operation: Air carrier
- Aircraft: [N179QS](https://openairdocs.org/aircraft/N179QS), registered now
- Make and model: Beech 400A
- Registry model: [Beech 400A](https://openairdocs.org/model/hawker-beechcraft-400a) (OpenAirDocs)
- Aircraft serial: RK578
- Aircraft time: 250 hours, 242 cycles
- System (JASC): [3243 · Master Cylinder/Brake Valve](https://openairdocs.org/jasc/3243)
- Part: Master Cylinder
- Part number: 45AS38401011
- Part serial: 3478
- Condition: Defective
- Location: Mlg Brakes
- Stage of operation: TX
- How discovered: O
- Nature of condition: S
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2009120703882

## Discrepancy

DURING TAXI OUT, CAPTAIN'S LT BRAKE PEDAL WENT ALL THE WAY TO STOP WHILE ATTEMPTING BRAKE APPLICATION, WITHOUT BRAKE EFFECTIVENESS.  MADE 2 ATTEMPTS W/O SUCCESS.  CO-PILOT BRAKES WORKED AND STOPPED ACFT. CAPT SIDE BRAKES REGAINED EFFECTIVENESS SHORTLY THEREAFTER. RETURNED TO FBO.  FOUND PILOTS LT MASTER BRAKE CYL DEFECTIVE.  REMOVED DEFECTIVE CYL. INSTALLED O/H CYL.  OPS & LEAK CK GOOD, WORK DONE IAW MM CHAPTER 32-40-00.

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