Air carrier flight crew reported experiencing smoke on the flight deck. Crew diverted to nearby.

Attributes
ACN	1329140
Time
Date	201602
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Widebody Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 105 Flight Crew Total 12000 Flight Crew Type 5500
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

In flight approximately 40 miles west of an enroute fix; first officer (first officer) saw smoke rising vertically above glare shield directly above the center of his yoke. He checked for a burning smell in the area of the yoke trim switches and map light rheostat. He could not identify the source. Moments later he saw another stream of smoke in the same area. He identified an electrical smoke smell. He noted some exposed wire on a light green wire that powers the map reading light. Though it appeared that the smoke had come from this area; we could not say so conclusively. We contacted flight control; declared an emergency; and diverted into the nearest suitable airport.

Original NASA ASRS Text

Title: Air carrier flight crew reported experiencing smoke on the flight deck. Crew diverted to nearby.

Narrative: In flight approximately 40 miles west of an enroute fix; First Officer (FO) saw smoke rising vertically above glare shield directly above the center of his yoke. He checked for a burning smell in the area of the yoke trim switches and map light rheostat. He could not identify the source. Moments later he saw another stream of smoke in the same area. He identified an electrical smoke smell. He noted some exposed wire on a light green wire that powers the map reading light. Though it appeared that the smoke had come from this area; we could not say so conclusively. We contacted flight control; declared an emergency; and diverted into the nearest suitable airport.

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.