# SDR DXTA2026042207717

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 20, 2026
- Submitted: April 22, 2026
- Operation: Air carrier
- Aircraft: [N453QS](https://openairdocs.org/aircraft/N453QS), registered now
- Make and model: Emb EMB-505
- Registry model: [EMB EMB-505](https://openairdocs.org/model/embraer-executive-emb-505) (OpenAirDocs)
- Aircraft serial: 50500683
- Aircraft time: 3,744 hours, 2,946 cycles
- System (JASC): [3240 · Landing Gear Brake System](https://openairdocs.org/jasc/3240)
- Part: Control Unit
- Part number: DAP0010011
- Part serial: 501870826
- Condition: Inoperative
- Location: Brake Sys
- Stage of operation: TX
- How discovered: C
- Nature of condition: O
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2026042207717

## Discrepancy

WHILE TAXIING OUT TO RUNWAY AT A LOW SPEED, BRAKES FELT LIKE THEY WERE GRABBING AT QUICK INTERVALS. WHILE BACK-TAXIING ON THE RUNWAY, WE TESTED THE BRAKES AT A SLIGHTLY HIGHER SPPED APPROX. 40 KTS AND UPON BRAKING, THEY WERE GRABBING EVEN WORSE.   REPLACE THE BRAKE CONTROL UNIT. REMOVED SUSPECTED INOP BRAKE CONTROL UNIT P/N DAP00100-11 S/N 501870826. INSTALLED A TESTED BRAKE CONTROL UNIT P/N DAP00100-11 S/N 288160289. OPS AND LEAK CHECK GOOD IAW EMB-505 AMM CH 32-41-01

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