# SDR ASAA201805144594

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 13, 2018
- Submitted: May 14, 2018
- Operation: Air carrier
- Aircraft: [N494AS](https://openairdocs.org/aircraft/N494AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41729
- Aircraft time: 9,039 hours, 2,992 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Condition: Malfunctioned
- Location: Left
- 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/ASAA201805144594

## Discrepancy

LEFT FMC ALERTED VTK ON LT MAP, BOTH CDU SCREENS WENT MENU. LNAV/VNAV DISCONNECTED, NO FMC FAILURE. THE FMC CAME BACK, BUT THERE WERE SEVERAL MORE VTK MESSAGES AFTER THE INITIAL ALERT.  CONTINUED ON ONE FMC.  ACFT GROUNDED. FFR FOR FLT 1 SHOWS FMC - L, PGM FAULT I.  NO HISTORY FOR 60 DAYS. PULLED & RESET THE NR 1 FMC CIRCUIT BREAKERS. OPS CHECKED THE NR 1 & 2 FMCS.  CHECKED GOOD IAW AMM 34-61-00.

---
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.