# SDR ASAA2023032642602

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 26, 2023
- Submitted: March 28, 2023
- Operation: Air carrier
- Aircraft: [N956AK](https://openairdocs.org/aircraft/N956AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 43360
- Aircraft time: 641 hours, 184 cycles
- System (JASC): [3400 · Navigation System](https://openairdocs.org/jasc/3400)
- 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/ASAA2023032642602

## Discrepancy

IN CRUISE LOSS OF LNAV & VNAV WITH FMC P/RST LIGHT & NO FMC ON EITHER CDU. NO MAP INFO ON CAPT DISPLAY. REFERRED QRH & POSITIONED FMC SWITCH TO BOTH ON RIGHT WHICH RESTORED NORMAL SINGLE FMC OPERATION. GROUNDED - YES. CYCLED BOTH FMC C/B REF B737-9 IFIM 34-61-00-810-918. LEFT FMC RESTORED. NO FAULTS NOTICED.

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