# SDR ASAA2021102536404

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 25, 2021
- Submitted: October 27, 2021
- Operation: Air carrier
- Aircraft: [N584AS](https://openairdocs.org/aircraft/N584AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35682
- Aircraft time: 51,647 hours, 15,322 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: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021102536404

## Discrepancy

DURING CRUISE WE LOST VNAV GUIDENCE AN THE #1 FMC AND BOTH FMC'S WENT BLANK. WE HAD A VTK ON DISPLAY #1. AFTER A BREIF PERIOD ALL SYSTEMS WERE RESTORED. GROUNDED - YES. PERFORMED B737-800 FIM 34-61 TASK 836 "FMC DOES NOT OPERATE" NO FAULTS NOTED, NO HISTORY, OK FOR SERVICE.

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