# SDR ASAA2020082193054

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 19, 2020
- Submitted: August 21, 2020
- Operation: Air carrier
- Aircraft: [N492AS](https://openairdocs.org/aircraft/N492AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44110
- Aircraft time: 18,241 hours, 5,861 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Condition: Malfunctioned
- Location: Cockpit
- 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/ASAA2020082193054

## Discrepancy

DURING FLIGHT CAPTAIN'S NAV DISPLAYED VTK FOLLOWED BY MAP FAILURE FLAG.  DURING THE FAILURE THERE WAS NO FMC DATA ON BOTH CDUS.  AFTER 90 SECONDS CAPTAIN`S FMC RETURNED TO NORMAL OPS AND FMC DATA RETURNED TO BOTH CDUS.  GROUNDED - YES.  RAN B737-900 FIM TASK 34-61 TASK 836, OPS RESTORED.  CHECKS OK, REFERENCE SAME.

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