# SDR ASAA2018092426218

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 21, 2018
- Submitted: September 24, 2018
- Operation: Air carrier
- Aircraft: [N433AS](https://openairdocs.org/aircraft/N433AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41704
- Aircraft time: 19,577 hours, 6,452 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Unknown
- Condition: Malfunctioned
- Location: Cockpit
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018092426218

## Discrepancy

VTK AND MAP ACCOMPANIED BY LNAV AND VNAV DISCONNECTING. THIS OCCURRED ON THE CAPTAIN'S DISPLAY UNIT. CREW ACCOMPLISHED RELATED QRH PROCEDURES AND THE ISSUE WAS RESOLVED. GROUNDED - YES. CAPT'S FMC OPS NORMAL REF FIM 34-61 TASK 837.

---
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.