FO ASSUMES PIC'S POS AS CAPT WHEN FLC BEHAVIOR ILLNESS INCAPACITATION TAKES CAPT OUT OF THE SEAT.

Narrative

CAPT HAD UNCTLABLE NOSEBLEED. CAUSE UNKNOWN. FO ASSIGNED TO L SEAT AND PIC; FOB (INTL OFFICER) TO FO POS AND LANDED ACFT WITHOUT INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE OTHER PLT IN THE EVENT CALLED BACK; RPTING THE ACFT TYPE AS AN MD-11; HE STATED THAT THE CAPT SUFFERED THE NOSEBLEED BECAUSE HE WAS RECOVERING FROM A BAD COLD AND HAD BEEN TAKING LARGE DOSES OF ASPIRIN; THUS THINNING HIS BLOOD. APPARENTLY; ANY SNEEZING OR IRRITATION THE CAPT EXPERIENCED ALLOWED THE BLEEDING TO START. RPTR STATED THAT THE OTHER PLT WHO TOOK THE L SEAT AND GOT 'TILLER TIME' HAD BEEN A 767 CAPT AND WAS MORE EXPERIENCED IN GND OPS AND STEERING. ALL CREW MEMBERS CONCURRED IN THE SEATING ARRANGEMENTS IN THE COCKPIT. SUPPLEMENTAL INFO FROM ACN 291184: FOB INSTRUCTED TO LAND ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR CALLED WAS THE FO WHO TOOK THE CAPT'S SEAT AND HAD THE FOB OR IRO TAKE THE FO SEAT AND MAKE THE LNDG. THAT DECISION WAS MADE BECAUSE THE FO IN THE PIC POS HAD NOT MADE A LNDG IN THE ACFT FROM THE L SEAT BUT HAD 'TILLER' TIME. THE FOB HAD EXPERIENCE IN LNDGS FROM THE R SEAT SO THE CREW SAW NO PROB WITH THE DECISION. THE CAPT FELL ILL IN THE MIDDLE OF THE PACIFIC SO THEY CONTINUED TO DEST MAINLAND ARPT. CAPT STAYED IN THE JUMP SEAT. PROBABLY TO OBSERVE AND ALSO NOT TO ALARM PAX.