# SDR ASAA2022072239185

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 22, 2022
- Submitted: July 25, 2022
- Operation: Air carrier
- Aircraft: [N481AS](https://openairdocs.org/aircraft/N481AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44106
- Aircraft time: 25,905 hours, 8,130 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Part number: UNKNOWN
- Condition: Intermittent
- 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/ASAA2022072239185

## Discrepancy

CAPT NAV DISPLAY HAD VTK FLAG LNAV DISAGREED AND LEFT FMC BLANKED AT CRUISE. SWITCHED TO USING RT FMC AND AUTOPILOT WITHIN 5 MINS LEFT FMC RESTORED. GROUNDED - YES. FOUND L FMC DATE RATE FAULT LOGGED BY R FMC. CW RESET PER B737-900 FIM 34-61 TASK 807. OPS NORMAL.

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