# SDR AALA201905179004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 16, 2019
- Submitted: May 17, 2019
- Operation: Air carrier
- Aircraft: [N941NN](https://openairdocs.org/aircraft/N941NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 33232
- Aircraft time: 17,920 hours, 6,624 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Unknown
- Condition: Malfunctioned
- Location: Cockpit
- Stage of operation: CL
- 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/AALA201905179004

## Discrepancy

AIRCRAFT NOT GROUNDED: PILOT REPORTS NEARING TOP OF CLIMB, ALL VNAV DATA LOST ON CLIMB, CRUISE AND DESCENT PAGES. PERF PAGE WOULD NOT ACCEPT ANY COST INDEX NUMBER. CDU MESSAGE DISPLAYED - VNAV INVALID-PERF. MAINTENANCE ACCOMPLISHED BITE OF FMC IAW FIM 34-61-00-810-801. OUTBOUND FLT CREW WAS ABLE TO LOAD FLT PLAN NORMALLY.

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