CE560 pilot reported that the FMS failed and gave out a puff of smoke and an odor.

Attributes
ACN	1555227
Time
Date	201806
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citation V/Ultra/Encore (C560)
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Captain
Qualification	Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 8000 Flight Crew Type 4000
Events
Anomaly	Aircraft Equipment Problem Less Severe Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

While in cruise flight at FL410 the FMS computer failed and gave out a puff of smoke and a smell. This caused us to [advise ATC] and descend to land. We followed procedures for both smoke in the cockpit and electronic failure checklists. Center and tower controllers were exceptionally helpful with our requests. The landing was made VFR with no other failures to report and was uneventful.

Original NASA ASRS Text

Title: CE560 Pilot reported that the FMS failed and gave out a puff of smoke and an odor.

Narrative: While in cruise flight at FL410 the FMS computer failed and gave out a puff of smoke and a smell. This caused us to [advise ATC] and descend to land. We followed procedures for both smoke in the cockpit and electronic failure checklists. Center and Tower controllers were exceptionally helpful with our requests. The landing was made VFR with no other failures to report and was uneventful.

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.