# SDR ASAA2013112196485

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 21, 2013
- Submitted: November 25, 2013
- Operation: Air carrier
- Aircraft: [N590AS](https://openairdocs.org/aircraft/N590AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35687
- Aircraft time: 22,461 hours, 6,911 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Autopilot Sys
- Condition: Malfunctioned
- Stage of operation: CR
- 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/ASAA2013112196485

## Discrepancy

WITH AUTOPILOT B ENGAGED AT FL 360 IN LNAV & VNAV F/O MAP DISPLAYED AMBER VTK FLAG.  PFD SHOWED AMBER LANDING ALT.  AUTOPILOT B COMMAND CHANGED.  LNAV DISENGAGED.  FOLLOWED QRH ITEMS.  VTK & LDG ALT AMBER FLAGS WENT AWAY.  ACFT GROUNDED.  ACCOMPLISHED DFCS BITE, OPS CHECK NORMAL IAW AMM REF 22-11-00.  CANNOT VERIFY DISCREPANCY.  GROUND VERIFICATION SUCCESSFUL.

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