Emb-145 first officer reported a track deviation when the FMS failed to navigate direct to the clear...

Attributes
ACN	1241204
Time
Date	201502
Local Time Of Day	1201-1800
Place
Locale Reference	ZME.ARTCC
State Reference	TN
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

While in cruise flight to clt; ATC instructed the crew to proceed direct to the mei waypoint. The waypoint was entered into the FMS and both pilots verified the aircraft was indeed proceeding to the selected course. For an unknown reason the aircraft continued turning past the desired course about 60 degrees although this was not selected. After about 15 seconds the crew noticed the course deviation and corrected. ATC verified we were on course after we initiated the turn back on course.the aircraft deviated from the assigned course for approximately 15 seconds.verify the aircraft actually intercepts the course it says it will rather than just both crewmembers verifying the aircraft is turning toward the course and the correct course is set.

Original NASA ASRS Text

Title: EMB-145 FO reported a track deviation when the FMS failed to navigate direct to the cleared fix.

Narrative: While in cruise flight to CLT; ATC instructed the crew to proceed direct to the MEI waypoint. The waypoint was entered into the FMS and both pilots verified the aircraft was indeed proceeding to the selected course. For an unknown reason the aircraft continued turning past the desired course about 60 degrees although this was not selected. After about 15 seconds the crew noticed the course deviation and corrected. ATC verified we were on course after we initiated the turn back on course.The aircraft deviated from the assigned course for approximately 15 seconds.Verify the aircraft actually intercepts the course it says it will rather than just both crewmembers verifying the aircraft is turning toward the course and the correct course is set.

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.

Emb-145 first officer reported a track deviation when the FMS failed to navigate direct to the cleared fix.