# SDR ASAA2018121077262

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 2018
- Submitted: December 11, 2018
- Operation: Air carrier
- Aircraft: [N570AS](https://openairdocs.org/aircraft/N570AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35185
- Aircraft time: 45,146 hours, 13,430 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Unknown
- Condition: Multiple Fail
- Location: Fmc
- Stage of operation: CR
- How discovered: O
- Nature of condition: G
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018121077262

## Discrepancy

WHILE IN CRUISE FL360 FMC P/RST SWITCH LIGHTS ILLUMINATED AND NO SCRATCHPAD MESSAGE WAS DISPLAYED. LOST BOTH LNAV AND VNAV. CHECKED QRH. REENGAGED LNAV AND VNAV AFTER APPROXIMATELY 2 MINUTES. NO FURTHER FAILURES. ALSO VTK WAS NEVER DISPLAYED. GROUNDED - YES. PERFORMED B737-800 FIM TASK 34-61 TASK 836-NO DEFECTS OR FAULTS FOUND. ALL OPS CHECKS NORMAL. AIRCRAFT OK FOR SERVICE AT THIS TIME.

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