Narrative:

Northeast of ZZZ at FL390; captain asked me if I smelled smoke. I told him it smelled like maintenance cleaner or lubricant. Immediately after his question; I noticed smoke behind the captain's seat. I informed him and we complied with the 'smoke or fumes removal checklist' memory items. Captain declared an emergency with center. We then diverted to the nearest suitable airport which was ZZZ1 and then complied with the 'smoke and fumes removal checklist' in the QRH. Captain then asked me to set up the FMC and radios. After completing the FMC and radios; he asked me to do the 'in-range checklist.' at this phase of the flight; I would describe the smoke as light in the cockpit. We were then given clearance to land at ZZZ1 I asked the tower to give us any indication of the condition of our aircraft. They did not indicate that any smoke or fire was visible. After landing we coordinated with ZZZ1 ground and emergency personnel to evaluate the aircraft condition. After a short taxi we completed all the after landing; parking and shutdown checklists and prepared for evacuate/evacuation. Injuries -- none. First officer experienced vomiting after deplaning due to a burning feeling in his throat. Captain was taken to the fire station and was given oxygen. Both pilots' visual signs were checked; first officer's were normal with an elevated pulse; captain was monitored from initial contact and while at the fire station. 4 other maintenance personnel who were passenger were not injured.

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Original NASA ASRS Text

Title: A B757-200 FLT CREW EXPERIENCED SMOKE IN THE COCKPIT. THEY RAN THE CHECKLIST; DECLARED AN EMERGENCY; AND DIVERTED TO THE NEAREST SUITABLE AIRPORT.

Narrative: NE OF ZZZ AT FL390; CAPT ASKED ME IF I SMELLED SMOKE. I TOLD HIM IT SMELLED LIKE MAINT CLEANER OR LUBRICANT. IMMEDIATELY AFTER HIS QUESTION; I NOTICED SMOKE BEHIND THE CAPT'S SEAT. I INFORMED HIM AND WE COMPLIED WITH THE 'SMOKE OR FUMES REMOVAL CHKLIST' MEMORY ITEMS. CAPT DECLARED AN EMER WITH CTR. WE THEN DIVERTED TO THE NEAREST SUITABLE ARPT WHICH WAS ZZZ1 AND THEN COMPLIED WITH THE 'SMOKE AND FUMES REMOVAL CHKLIST' IN THE QRH. CAPT THEN ASKED ME TO SET UP THE FMC AND RADIOS. AFTER COMPLETING THE FMC AND RADIOS; HE ASKED ME TO DO THE 'IN-RANGE CHKLIST.' AT THIS PHASE OF THE FLT; I WOULD DESCRIBE THE SMOKE AS LIGHT IN THE COCKPIT. WE WERE THEN GIVEN CLRNC TO LAND AT ZZZ1 I ASKED THE TWR TO GIVE US ANY INDICATION OF THE CONDITION OF OUR ACFT. THEY DID NOT INDICATE THAT ANY SMOKE OR FIRE WAS VISIBLE. AFTER LNDG WE COORDINATED WITH ZZZ1 GND AND EMER PERSONNEL TO EVALUATE THE ACFT CONDITION. AFTER A SHORT TAXI WE COMPLETED ALL THE AFTER LNDG; PARKING AND SHUTDOWN CHKLISTS AND PREPARED FOR EVAC. INJURIES -- NONE. FO EXPERIENCED VOMITING AFTER DEPLANING DUE TO A BURNING FEELING IN HIS THROAT. CAPT WAS TAKEN TO THE FIRE STATION AND WAS GIVEN OXYGEN. BOTH PLTS' VISUAL SIGNS WERE CHKED; FO'S WERE NORMAL WITH AN ELEVATED PULSE; CAPT WAS MONITORED FROM INITIAL CONTACT AND WHILE AT THE FIRE STATION. 4 OTHER MAINT PERSONNEL WHO WERE PAX WERE NOT INJURED.

Data retrieved from NASA's ASRS site as of May 2009 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.