# SDR ASAA2023081144563

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 11, 2023
- Submitted: August 14, 2023
- Operation: Air carrier
- Aircraft: [N419AS](https://openairdocs.org/aircraft/N419AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41734
- Aircraft time: 38,758 hours, 12,262 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: CR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023081144563

## Discrepancy

WHILE AT CRUISE, LEFT MCDU WENT BLANK AND APPEARED TO PERFORM REPEATED REBOOTS / BIT TESTS. AFTER SEVERAL MINUTES IT RETURNED TO NORMAL OPERATION. GROUNDED - YES. PERFORMED FIM TEST 34-61 TASK 836. BOTH FMC'S AND MCDU'S WORK NORMALLY NOTIFIED SEAMC JEFF.NON ASA EMP, FAA #2777833.

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