# SDR ASAA2019010527683

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 5, 2019
- Submitted: January 8, 2019
- Operation: Air carrier
- Aircraft: [N597AS](https://openairdocs.org/aircraft/N597AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35689
- Aircraft time: 40,885 hours, 12,459 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: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019010527683

## Discrepancy

ON CLIMBOUT - FMC MESSAGE "VNAV INVALID PERF". FMC HAD DROPPED THE COST INDEX OUT. AFTER REINSTALLING COST INDEX NORMAL OPS. GROUNDED - YES. PERFORMED FIM 34-61 TASK 807 AFTER RESET BOTH FMC'S CAME UP NORMAL.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.