An embraer 120 in cruise at 17000 ft declared an emergency and diverted due to smoke in the cockpit and cabin caused by a burned recirculation fan and wiring.

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Attributes
ACN	392860
Time
Date	199802
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mlb
State Reference	FL
Altitude	msl bound lower : 17000 msl bound upper : 17000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 135
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute airway : zma
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 12000 flight time type : 6000
ASRS Report	392860
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

While en route from nassau to orlando, fl, the cabin and cockpit started to fill with smoke. We had already started the initial descent so we requested an immediate descent to 10000 ft. After donning our oxygen masks we proceeded with the checklist. The smoke did clear and at that time we were informed that the closest airport was melbourne which we elected to land at. As a precaution we requested the fire trucks and declared an emergency. After an uneventful landing we proceeded to a parking spot where we deplaned the passenger. Callback conversation with reporter revealed the following information: the reporter stated the source of the smoke was the left recirculation fan in the left distribution duct that shorted out and burned the fan and fan wiring. The reporter stated the circuit breaker for the fan did not trip.

Original NASA ASRS Text

Title: AN EMBRAER 120 IN CRUISE AT 17000 FT DECLARED AN EMER AND DIVERTED DUE TO SMOKE IN THE COCKPIT AND CABIN CAUSED BY A BURNED RECIRCULATION FAN AND WIRING.

Narrative: WHILE ENRTE FROM NASSAU TO ORLANDO, FL, THE CABIN AND COCKPIT STARTED TO FILL WITH SMOKE. WE HAD ALREADY STARTED THE INITIAL DSCNT SO WE REQUESTED AN IMMEDIATE DSCNT TO 10000 FT. AFTER DONNING OUR OXYGEN MASKS WE PROCEEDED WITH THE CHKLIST. THE SMOKE DID CLR AND AT THAT TIME WE WERE INFORMED THAT THE CLOSEST ARPT WAS MELBOURNE WHICH WE ELECTED TO LAND AT. AS A PRECAUTION WE REQUESTED THE FIRE TRUCKS AND DECLARED AN EMER. AFTER AN UNEVENTFUL LNDG WE PROCEEDED TO A PARKING SPOT WHERE WE DEPLANED THE PAX. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE SOURCE OF THE SMOKE WAS THE L RECIRCULATION FAN IN THE L DISTRIBUTION DUCT THAT SHORTED OUT AND BURNED THE FAN AND FAN WIRING. THE RPTR STATED THE CIRCUIT BREAKER FOR THE FAN DID NOT TRIP.

Data retrieved from NASA's ASRS site as of July 2007 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.