Emb-175 flight crew reported experiencing a flight management system failure.

Attributes
ACN	1649145
Time
Date	201905
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	EMB ERJ 170/175 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types

Narrative:

We noticed on the STAR portion of the arrival the FMS (flight management system) was not properly sequencing the arrival. The FMS wanted to take the plane off course. We notified ATC and they gave us a heading and altitude to fly. We thought we were able to correct the issue with FMS and ATC gave a new clearance to fly directly to the IAF on the RNAV Y rnw 27 ZZZ and as we flew on course to the IAF zzzzz we were cleared to fly the approach. We selected the approach altitude and started flying the approach. The autopilot was on and the FMS took the airplane off course in IMC. We were about 300 feet below that correct altitude. I overrode the autopilot and told the captain what was happening. He took over the controls. We set the localizer frequency and told ATC that we lost all navigation. About 15 seconds later we broke out of the clouds and flew a visual approach. We landed the airplane safely. On the ground we notified maintenance. Total FMS navigation failure. Recommend maintain vigilance and notify ATC immediately when anything like this happens and ask for a heading and altitude right away.

Original NASA ASRS Text

Title: EMB-175 flight crew reported experiencing a Flight Management System Failure.

Narrative: We noticed on the STAR portion of the arrival the FMS (Flight Management System) was not properly sequencing the arrival. The FMS wanted to take the plane off course. We notified ATC and they gave us a heading and altitude to fly. We thought we were able to correct the issue with FMS and ATC gave a new clearance to fly directly to the IAF on the RNAV Y RNW 27 ZZZ and as we flew on course to the IAF ZZZZZ we were cleared to fly the approach. We selected the approach altitude and started flying the approach. The autopilot was on and the FMS took the airplane off course in IMC. We were about 300 feet below that correct altitude. I overrode the autopilot and told the Captain what was happening. He took over the controls. We set the LOC frequency and told ATC that we lost all navigation. About 15 seconds later we broke out of the clouds and flew a visual approach. We landed the airplane safely. On the ground we notified Maintenance. Total FMS navigation failure. Recommend maintain vigilance and notify ATC immediately when anything like this happens and ask for a heading and altitude right away.

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.