# SDR ASAA2021122036967

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 20, 2021
- Submitted: December 23, 2021
- Operation: Air carrier
- Aircraft: [N559AS](https://openairdocs.org/aircraft/N559AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35178
- Aircraft time: 54,448 hours, 16,014 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: TX
- 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/ASAA2021122036967

## Discrepancy

FMC DISAGREE DISPLAYED ON BOTH MCDU'S ON TAXI IN. GROUNDED - YES. L/H FMC HISTORY SHOWS PGM FAULT CAUSED DISAGREE. REBOOTED L/H FMC COMPUTER. BITE TEST OK REF V737-800 FIM 34-61 TASK 807 & 34-61 TASK 835. NORM OPS RESTORED.

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