# SDR ASAA2023021441952

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 14, 2023
- Submitted: February 16, 2023
- Operation: Air carrier
- Aircraft: [N570AS](https://openairdocs.org/aircraft/N570AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35185
- Aircraft time: 57,993 hours, 17,307 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: 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/ASAA2023021441952

## Discrepancy

DURING CRUISE FLIGHT VTK AND MAP FLAGS APPEARED ON LEFT NAV DISPLAY. BOTH CDU'S WENT TO MENU SCREENS. FIRST OFFICER'S NAV DISPLAY INDICATED A DRIFT .7-.8 NM RIGHT OF CRUISE. FAILURE WENT AWAY AND BOTH NAV DISPLAYS RETURNED TO NORMAL. GROUNDED - YES. FMCS BITE SHOWED PROGRAM FAULT LOGGED FOR LAST LEG. ACCOMPLISHED RESET AND TEST PER B737-800 FIM 34-61 TASK 807 AND FMCS OPERATIONAL TEST PER B737-800 AMM 34-61-0-710-801- ALL TESTS PASS.

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