# SDR ASAA2018120227199

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 2, 2018
- Submitted: December 6, 2018
- Operation: Air carrier
- Aircraft: [N459AS](https://openairdocs.org/aircraft/N459AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36352
- Aircraft time: 19,087 hours, 6,292 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Part number: 1762000101
- Part serial: 008602
- Condition: Intermittent
- Location: E&E Bay
- Part time: 19,104 hours, 6,295 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018120227199

## Discrepancy

VTK FLAG ILLUMINATED ON FO MCDU MAP DISPLAY. OCCURS INTERMITTENTLY ON V PATH CHANGE (LEVEL OFF AND INITIAL DESCENT) THEN RESTORES ITSELF WITHIN 30-60 SECONDS. GROUNDED - YES. REMOVED AND REPLACED RT FMC REF AMM 34-61-02, OPS CHECK NORMAL.

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