Narrative:

On approach with IMC weather into msp for RNAV Z 12R we had a failure to sequence problem with FMS load 27.1. I was PIC with pilot monitoring duties. We were cleared direct zesty cross zesty at 4000' cleared RNAV Z 12R. LNAV / VNAV were both active and app was selected. 3000 ft was selected for kinns and altitudes verified in FMS. Our course to zesty was approximately 100 deg heading. Reaching zesty the aircraft remained on the current heading of approximately 100 deg and failed to join final approach course. VNAV did capture and was descending on profile. The vertical profile view on the mfd was frozen. The CDI was deflecting to the left which was the opposite direction that we needed to fly. Both myself and the sic recognized this immediately. After a quick verification that all modes of navigation were armed correctly and the correct runway was selected we recognized it as a failure to sequence of the FMS load 27.1. I immediately called for missed approach. We conducted a missed approach in heading mode with ATC instructions. I notified tower that we had a RNAV problem and needed vectors for the ILS 12L. We flew approach ILS 12L and landed without further incident.with the weather being IMC with bases of 600 ft and the possibility of parallel traffic on runway 12L this failure of FMS load 27.1 had the potential to quickly become a CFIT or air to air collision. Luckily we recognized the problem and didn't waste any time executing a missed approach. Immediate correction of the known issues with FMS load 27.1. I currently do not feel safe relying on it for navigation.

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Original NASA ASRS Text

Title: EMB-175 Crew reported the FMS failed to sequence on an RNAV approach which resulted in a missed approach and were vectored for an ILS approach.

Narrative: On approach with IMC weather into MSP for RNAV Z 12R we had a failure to sequence problem with FMS load 27.1. I was PIC with pilot monitoring duties. We were cleared direct ZESTY cross ZESTY at 4000' cleared RNAV Z 12R. LNAV / VNAV were both active and APP was selected. 3000 ft was selected for KINNS and altitudes verified in FMS. Our course to ZESTY was approximately 100 deg heading. Reaching ZESTY the aircraft remained on the current heading of approximately 100 deg and failed to join final approach course. VNAV did capture and was descending on profile. The vertical profile view on the MFD was frozen. The CDI was deflecting to the left which was the opposite direction that we needed to fly. Both myself and the SIC recognized this immediately. After a quick verification that all modes of navigation were armed correctly and the correct runway was selected we recognized it as a failure to sequence of the FMS load 27.1. I immediately called for missed approach. We conducted a missed approach in heading mode with ATC instructions. I notified tower that we had a RNAV problem and needed vectors for the ILS 12L. We flew approach ILS 12L and landed without further incident.With the weather being IMC with bases of 600 ft and the possibility of parallel traffic on RWY 12L this failure of FMS load 27.1 had the potential to quickly become a CFIT or air to air collision. Luckily we recognized the problem and didn't waste any time executing a missed approach. Immediate correction of the known issues with FMS load 27.1. I currently do not feel safe relying on it for navigation.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.