# SDR ASAA2014012612497

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 26, 2014
- Submitted: January 28, 2014
- Operation: Air carrier
- Aircraft: [N453AS](https://openairdocs.org/aircraft/N453AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36354
- Aircraft time: 38 hours, 18 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Warning Message
- Condition: False Activation
- Stage of operation: CR
- How discovered: O
- Nature of condition: G, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2014012612497

## Discrepancy

DURING CRUISE, AUTOPILOT B ENGAGED,  FMC P/RST YELLOW ALERT LIGHT ILLUMINATED.  F/O MAP DISPLAY SHOWED VTX, FMA SHOWED CWS P, LNAV/VNAV DISENGAGED. AUTOPILOT REMAIN ENGAGED, AFTER SWITCHING TO AUTOPILOT A AND RESTORING LNAV & VNAV PROBLEM CLEARED ITSELF BEFORE QRH PROCEDURES.  ACFT GROUNDED.  COULD NOT DUPLICATE. ACCOMPLISHED FMCS OPS TEST IAW MM34-61-00, GROUND VERIFICATION TESTED NORMAL.

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