CABIN SMOKE AND FUMES RESULTS IN AN EMER DIVERSION FOR AN MD11 CREW.

Narrative

DURING CRUISE; A SLIGHT HAZE/SMOKE WAS NOTICED IN THE COCKPIT. A VISUAL INSPECTION OF MAIN CABIN REVEALED MODERATE SMOKE. AN IMMEDIATE DIVERSION TO ZZZ WAS INITIATED. SMOKE/FUMES CHKLIST ACCOMPLISHED. EMER DECLARED APCHING ZZZ. 350 KIAS MAINTAINED UNTIL 15 NM FINAL. LNDG WAS UNEVENTFUL. NOTE: SMOKE DETECTORS DID NOT ALERT CREW TO SMOKE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CALLBACK REVEALED THAT ONCE THE DECISION WAS MADE TO DIVERT; IT WAS APPROX 30 MINS TO LNDG. THE CABIN WAS DEPRESSURIZED AT FL250. SPD WAS MAINTAINED ABOVE 250 KTS BELOW 10000 FT; BECAUSE OF THE UNKNOWN SOURCE OF THE SMOKE AND FUMES. THERE WAS NO DOCUMENTED HAZMAT ON BOARD; BUT THERE WAS A CONCERN THAT THERE COULD BE SOME ANYWAY. HIGH SPD APCHS HAD BEEN PREVIOUSLY TRAINED FOR IN SIMULATOR SESSIONS. ARPT FIRE CREWS MET THE ACFT AND DETERMINED THERE WAS NO FIRE. THE SOURCE OF THE SMOKE WAS FOUND TO BE OIL IN THE PNEUMATIC BLEED SYS. WITH BLEED VALVES DEACTIVATED CLOSED; THE ACFT WAS DISPATCHED TO A MAINT STATION. THERE IT WAS BORESCOPED AND FOUND THAT AN OIL SEAL HAD FAILED. THE SEAL WAS REMOVED; OIL FILTER SCREENS CLEANED; AND AFTER COORD WITH THE ENG MANUFACTURER; IT WAS DISPATCHED TO THE ACR MAINT BASE WITH OIL CONSUMPTION MONITORING AS PART OF THE MEL DEFERRAL REQUIREMENT. AFTER APPROX 2 HRS OF FLT; ALL OIL WAS LOST AND ENG BEARING FAILURE OCCURRED.