C208 first officer reports observing smoke entering the cockpit through the avionics bay cooling exh...

Narrative:

At approximately 30 minutes before landing; and while in cruise at 9500 feet; myself and the captain observed smoke entering the cockpit through the avionics cooling bay exhaust port on top of the glare shield. The captain immediately turned off all switches and electronics in the cockpit. I read the emergency checklist for electrical fire and together we completed all of the actions. After completing the checklist the captain turned on electrical items one at a time to see if we could determine the source of the smoke. The smoke did not return after turning on the essential equipment we would need to continue the flight. We notified ATC of the problem but elected to not declare an emergency or divert to an alternate airport because we felt we had eliminated the source of the smoke and the essential equipment was functioning properly; also we were within 25 minutes of our intended airport by this time.

Original NASA ASRS Text

Title: C208 First Officer reports observing smoke entering the cockpit through the avionics bay cooling exhaust port on top of the glareshield. All switches are turned off; and then turned on one at a time until essential equipment is repowered with no smoke and the flight continues to destination.

Narrative: At approximately 30 minutes before landing; and while in cruise at 9500 feet; myself and the captain observed smoke entering the cockpit through the avionics cooling bay exhaust port on top of the glare shield. The captain immediately turned off all switches and electronics in the cockpit. I read the emergency checklist for ELECTRICAL FIRE and together we completed all of the actions. After completing the checklist the captain turned on electrical items one at a time to see if we could determine the source of the smoke. The smoke did not return after turning on the essential equipment we would need to continue the flight. We notified ATC of the problem but elected to not declare an emergency or divert to an alternate airport because we felt we had eliminated the source of the smoke and the essential equipment was functioning properly; also we were within 25 minutes of our intended airport by this time.

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.

Attributes
ACN	1201501
Time
Date	201409
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	Caravan Undifferentiated
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Component
Aircraft Component	Electrical Power
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Commercial
Events
Anomaly	Aircraft Equipment Problem Less Severe Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

C208 first officer reports observing smoke entering the cockpit through the avionics bay cooling exhaust port on top of the glareshield. All switches are turned off; and then turned on one at a time until essential equipment is repowered with no smoke and the flight continues to destination.