Narrative:

While in cruise, 5 mins after leveloff, engine exhaust-type fumes were noted. Use of oxygen was discussed and bleed sources were changed. Within 5 mins, the smoke detector in the cargo area was activated. We donned masks at that point and as PF, I initiated an emergency descent on vectors with ZOB. The captain and so worked checklists. Convinced we may have a cargo fire, my main objective was to get the aircraft on the ground. Since I did not want to slow down too much, I extended the landing gear at about 12000 ft doing 320 KTS -- 50 KTS in excess of vlo, vle is 320. Below 10000 ft my speed was above 250 KTS. I had declared an emergency. Having done high speed approachs in europe, I felt comfortable operating fast. We landed without further event. Maintenance found an oily sock on the pack (right) water separator. They felt that the oil heated up and caused the smoke/fumes.

Google
 

Original NASA ASRS Text

Title: B727 MAKES EMER DSCNT TO LAND AT CLE AFTER EXPERIENCING CARGO SMOKE DETECTION AND COCKPIT FUMES.

Narrative: WHILE IN CRUISE, 5 MINS AFTER LEVELOFF, ENG EXHAUST-TYPE FUMES WERE NOTED. USE OF OXYGEN WAS DISCUSSED AND BLEED SOURCES WERE CHANGED. WITHIN 5 MINS, THE SMOKE DETECTOR IN THE CARGO AREA WAS ACTIVATED. WE DONNED MASKS AT THAT POINT AND AS PF, I INITIATED AN EMER DSCNT ON VECTORS WITH ZOB. THE CAPT AND SO WORKED CHKLISTS. CONVINCED WE MAY HAVE A CARGO FIRE, MY MAIN OBJECTIVE WAS TO GET THE ACFT ON THE GND. SINCE I DID NOT WANT TO SLOW DOWN TOO MUCH, I EXTENDED THE LNDG GEAR AT ABOUT 12000 FT DOING 320 KTS -- 50 KTS IN EXCESS OF VLO, VLE IS 320. BELOW 10000 FT MY SPD WAS ABOVE 250 KTS. I HAD DECLARED AN EMER. HAVING DONE HIGH SPD APCHS IN EUROPE, I FELT COMFORTABLE OPERATING FAST. WE LANDED WITHOUT FURTHER EVENT. MAINT FOUND AN OILY SOCK ON THE PACK (R) WATER SEPARATOR. THEY FELT THAT THE OIL HEATED UP AND CAUSED THE SMOKE/FUMES.

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.