# SDR SWAA010978

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 1, 2001
- Submitted: April 9, 2001
- Operation: Air carrier
- Aircraft: N724SW
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 27856
- Aircraft time: 8,050 hours, 4,809 cycles
- System (JASC): [3240 · Landing Gear Brake System](https://openairdocs.org/jasc/3240)
- Part: Valve
- Part number: 52701010
- Part serial: 80627127
- Condition: Failed
- Location: Brake Sys
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA010978

## Discrepancy

DURING TAXI INTO POSITION FOR TAKEOFF, BRAKES LOCKED UP & RTO LIGHT ILLUMINATED.  AIRCRAFT WOULD NOT MOVE.  TOWED AIRCRAFT BACK TO GATE.  REMOVED AND REPLACED ANTI-SKID CONTROL UNIT AND PARKING BRAKE VALVE PER MM.  C/W BITE CHECK AND SPEED BRAKE RTO TEST PER MM, OPS CHECK GOOD.

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