# SDR G41A2026FA0000235

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 25, 2026
- Submitted: March 28, 2026
- Operation: General aviation
- Aircraft: [N824MG](https://openairdocs.org/aircraft/N824MG), registered now
- Make and model: Lear 55LEAR
- Aircraft serial: 106
- Aircraft time: 18,393 hours, 12,170 cycles
- Engine: Hnywl TFE73120
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fms
- Part number: 201742211
- Part serial: 1145
- Condition: Defective
- Location: Zone 200
- Stage of operation: CL
- How discovered: O
- Nature of condition: M
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/G41A2026FA0000235

## Discrepancy

AIRCRAFT DEPARTED KELP HEADING TO KAUS. ABOUT 10 MINUTES AFTER TAKEOFF, THE CAPTAIN NOTICED THE FMS SCREEN HAD GONE BLANK. ATTEMPT TOP RE POWER WAS MADE WITH NO EFFECT. THE CAPTAIN DECIDED TO RETURN TO ELP.  ATI MAINTENANCE AND AVIONICS MET THE AIRCRAFT AND VERIFIED THE FMS UNIT WAS NOT POWERING BACK ON. THE UNIT WAS PULLED AND FOUND TO BE EXTREMELY HOT. AFTER COOLING THE UNIT WAS RE INSTALLED AND IT POWERED UP - COLLING FAN NEVER TURNED ON AND THE UNIT GOT HOT AGAIN. A REPLACEMENT FMS WAS INSTALLED AND WHEN POWERED UP, THE COOLING FAN IMMEDIATELY TURNED ON. IT WAS DETERMINED THAT THE TEMP SENSOR OR THE FAN WAS INOP IN THE UNIT REMOVED. THE REPLACEMENT FMS WAS LEFT POWERED UP FOR TWO HOURS WITH NO OPERATIONAL ISSUES NOTED. THE AIRCRAFT WAS THEN RETURNED TO SERVICE.

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