Narrative:

Had leveled off at FL310 when we detected smoke in cockpit. The smoke had an oily nature, not electrical. The captain (PF) immediately declared an emergency. ZTL gave us FL240. We suspected bleed air. The captain turned bleeds to both off and dumped cabin. We descended, were given 11000 ft, then 6000 ft, and told to contact gsp approach 118.8. We called the field in sight and were cleared to land. There was no fire, only smoke. The captain filled out the form from the fireman who sent it to the tower at gsp. At this time the reason for the smoke is yet to be solved.

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Original NASA ASRS Text

Title: EMER DSCNT PERFORMED BY THE CREW OF A CE550 WHEN THEY DETECT SMOKE IN THE COCKPIT AT FL310 ON FREQ WITH ZTL, GA.

Narrative: HAD LEVELED OFF AT FL310 WHEN WE DETECTED SMOKE IN COCKPIT. THE SMOKE HAD AN OILY NATURE, NOT ELECTRICAL. THE CAPT (PF) IMMEDIATELY DECLARED AN EMER. ZTL GAVE US FL240. WE SUSPECTED BLEED AIR. THE CAPT TURNED BLEEDS TO BOTH OFF AND DUMPED CABIN. WE DSNDED, WERE GIVEN 11000 FT, THEN 6000 FT, AND TOLD TO CONTACT GSP APCH 118.8. WE CALLED THE FIELD IN SIGHT AND WERE CLRED TO LAND. THERE WAS NO FIRE, ONLY SMOKE. THE CAPT FILLED OUT THE FORM FROM THE FIREMAN WHO SENT IT TO THE TWR AT GSP. AT THIS TIME THE REASON FOR THE SMOKE IS YET TO BE SOLVED.

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.