# SDR SIMA202512296001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 26, 2025
- Submitted: December 29, 2025
- Operation: Air carrier
- Aircraft: [N750BD](https://openairdocs.org/aircraft/N750BD), registered now
- Make and model: Emb ERJ 170-100 SE
- Registry model: [EMB ERJ 170-100 SE](https://openairdocs.org/model/embraer-erj-170-100-se) (OpenAirDocs)
- Aircraft serial: 17000075
- Aircraft time: 49,172 hours, 31,589 cycles
- System (JASC): [3400 · Navigation System](https://openairdocs.org/jasc/3400)
- Part: Reference Unit
- Part number: HG2100AB02
- Condition: Failed
- Location: Zone 200
- Stage of operation: DE
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SIMA202512296001

## Discrepancy

LOST MULTIPLE NAV SYSTEMS AT 11,000FT WE LOST AUTO THROTTLE AND SHORTLY AFTER, AUTOPILOT FAILED. A FEW MINUTES LATER IRS 2 FAILED ALONG WITH FO ATTITUDE INDICATOR. APPR 1 AND APPR 2 NOT AVAILABLE MESSAGES APPEARED SUBSEQUENTLY ALONG WITH STICK SHAKER ANTICIPATED. ABOUT 10 MINUTES LATER WE GOT EVERYTHING BACK EXCEPT APPR 2. EMERGENCY DECLARED. RAR IRU 2 IAW AMM 34-26-01. OPS CHECK GOOD, NO FAULT MSGS

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