# SDR SWIA2026071976658

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 19, 2026
- Submitted: July 21, 2026
- Operation: Air carrier
- Aircraft: [N628SY](https://openairdocs.org/aircraft/N628SY), registered now
- Make and model: Emb ERJ 170-200 LL
- Registry model: [EMB ERJ 170-200 LL](https://openairdocs.org/model/embraer-s-a-erj-170-200-ll) (OpenAirDocs)
- Aircraft serial: 17000983
- Aircraft time: 3,160 hours, 2,530 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Condition: Warning Message
- Location: Zone 100
- Stage of operation: AP
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWIA2026071976658

## Discrepancy

DURING MISSED APPROACH OUT OF ASE DUE TO A 20KT GAIN AT MINIMUMS.  HAD FINISHED CLEANING UP THE AIRPLANE AND ENCOUNTERED HEAVY MODERATE TURBULENCE, SHORTLY AFTER,  WAS PF & WAS CHANGING OUR FMS SPEEDS TO 250 TO SAVE FUEL FOR THE DIVERT.  MY FO WAS BUILDING THE DIVERT FLIGHT PLAN. BOTH MCDUS STOPPED RESPONDING, & DISPLAYED PROCESSING INPUT, THEN TIMEOUT, THEN SYNC IN PROGRESS, THEN EVENTUALLY EICAS FMS1 FAIL, FOLLOWED BY FMS2 FAIL. THEN MY FO WHO WAS NOW FLYING, NOTICED THE AUTOPILOT WAS NOT RESPONDING, & TURNED IT OFF. SHORTLY AFTER AT FAIL POPULATED WITH FMS VERT AND LATERAL OFF.  FLEW TO GJT WITH NO AUTOMATION AT ALL, FO WAS ABLE TO GET FMS 2 TO BEHAVE LONG ENOUGH TO ENTER LANDING SPEEDS FROM THE QRH. BOTH FMS CONTINUED TO CYCLE BETWEEN THE FAILED MESSAGES AND WERE UNRESPONSIVE.  (FLIGHT 5279)  TROUBLE SHOT FMS 1 FAIL & FMS 2 FAIL IAW FIMS 34-61-00-810-832-A, AND 34-61-00-810-817-A, FOUND TO BE TRANSITORY CONDTIONS OF THE NIC & PROC (MAU2-NIC1) AND NIC & PROC MOD 5 (MAU3-NIC1). AT FAIL, FMS VERT AND LATERAL OFF ALL DO THE LOSE OF THE FMS 1 & 2. NO 30 DAY HISTORY  OK FOR CONTINUED SERVICE AT THIS TIME. NO HISTORY NOTED FOR EITHER FMS AT THIS TIME.

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