AN MD11 FREIGHTER MAKES AN EMER RETURN LAND AT SFO WHEN THERE IS SMOKE COMING FROM THE CABIN AREA. THE SMOKE WAS DETECTED BY A DEADHEADING MD11 FO WHO CALLED OVER THE INTERCOM.

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PASSING 5000 FT JUMP SEATING CREW MEMBER AFT OF COCKPIT DOOR YELLED SMOKE INTO THE INTERCOM. I (CAPT WAS FLYING) TOLD CHK PLT (LINE CHK) ON JUMP SEAT (MD11) TO CHK. AS HE OPENED THE DOOR; SMOKE CAME INTO COCKPIT. I IMMEDIATELY DECLARED AN EMER WITH BAY DEP AND TURNED R TO INTERCEPT THE RWY 28R ILS AT SFO. NICE VECTORS BY BAY PUT ME ON THE GND WITHIN 5 MINS. THE SHORTENED TIME FRAME; NEW (4 MONTHS) FO; MADE IT IMPOSSIBLE TO DO APPROPRIATE CHKLISTS. I HAD CHK PLT DO SMOKE/FIRE CHKLIST AND AT LEAST WE GOT INTO MANUAL AIR AND THE PACKS OFF. I MAINTAIN A 2 MAN CREW ACFT IS RIDICULOUS IN AN EMER WHEN NEW DATA HAS TO BE LOADED INTO THE FMS. THE CAPT IS FLYING ETC -- WHO IS SUPPOSED TO DO THE CHKLIST? ALSO; I HAD TO BRING 2 JUMP SEATERS INTO THE COCKPIT (5 IN COCKPIT). AFTER AN UNEVENTFUL LNDG; GIVEN REST PERIOD AND WENT TO SLEEP! COMPANY STILL DOES NOT KNOW CAUSE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE CAPT RPTR STATED THAT THE TIME ALOFT WAS LESS THAN 5 MINS; GIVING HIM LITTLE CHANCE TO GET HIS SMOKE MASK ON. THERE WAS NO ONE ELSE TO FLY THE ACFT AS THE NEW FO AND THE CHK PLT WERE TOO BUSY WITH COMS AND CHKLISTS TO AID IN THE MANUAL FLYING OF THE ACFT. AT A LATER TIME THE CAPT CHKED HIMSELF ON THE TIME IT WOULD TAKE TO DON THE MASK AND SET UP COMS. HE SAID THAT; IN THIS INSTANCE; HE WOULD HAVE BEEN ON THE GND BEFORE HE COULD HAVE HAD HIS MASK ON. HE WAS AWARE THAT THE SMOKE DID NOT APPEAR TO HAVE ANY ACRID SMELL TO IT; IT BEING A MODERATELY TINTED WHITE SMOKE; ONLY THE ESSENTIAL CHKLISTS WERE COMPLETED. THE ACFT WAS 'LIGHT;' WEIGHING 450000 LBS ON TKOF. HE TOOK THE SMOKE WARNING VERY SERIOUSLY SINCE THE INITIAL RPT OF THE SMOKE WAS FROM THE DEADHEADING MD11 FO SITTING IN ONE OF THE CABIN PAX SEATS. THE COMPANY; THE PLT'S UNION; THE NTSB AND THE FAA WERE ALL COPIED INTO THIS INCIDENT. THE ACR MAINT PEOPLE CHANGED THE AIR CONDITIONING PACK FILTERS; TOOK OFF THE FREIGHT. THE CREW WAS RELEASED FOR REST. NO CAUSE FOR THE SMOKE HAS BEEN FOUND TO THIS DATE.