# SDR DXTA2026010906458

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 6, 2026
- Submitted: January 9, 2026
- Operation: Air carrier
- Aircraft: [N163QS](https://openairdocs.org/aircraft/N163QS), registered now
- Make and model: Bombdr BD7001A10
- Aircraft serial: 9557
- Aircraft time: 6,331 hours, 2,431 cycles
- System (JASC): [3097 · Ice/Rain Protection System Wiring](https://openairdocs.org/jasc/3097)
- Part: Distribution Box
- Part number: 1705836B
- Part serial: 2022
- Condition: Faulty
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2026010906458

## Discrepancy

IN FLIGHT WE GOT A CYAN R PROBE MON FAIL MESSAGE, WHICH THEN TRIGGERED THREE AMBER CAS MESSAGES: R AOA HEAT FAIL, PITOT 2 HT FAIL AND STBY PITOT HT FAIL.  THIS ALL BEGAN WHEN THE HBMU 2 CIRCUIT BREAKER TRIPPED ON THE EMS-CDU.   T/S SYSTEM, REMOVED SUSPECTED HBMU FAULT REMAINED. REINSTALLED HBMU. ALL WORK IN REF. TO AMM 30-31-01. T/S SYSTEM FURTHER, FOUND #4 SPDA AT FAULT, REMOVED FAULTY #4 SPDA (P/N -1705836B S/N -2022). AND INSTALLED MODIFIED UNIT (P/N -1705836B S/N -1506). OPS CHECKS OK. ALL WORK IN REF TO GL-6000S AMM 24-62-01.

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