NEW CABIN ATTENDANT INTERRUPTED THE STERILE COCKPIT RULE WHEN SHE BURST THROUGH THE COCKPIT DOOR DURING DSCNT AT 8000 FT AND AGAIN INSIDE THE OM ON AN ILS APCH WHILE IN IMC CONDITIONS. THE CREW BOTH TIMES IMMEDIATELY INSTRUCTED HER TO LEAVE THE COCKPIT.

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WE WERE ON A HIGH SPD CONTINUOUS DUTY OVERNIGHT. WE HAD A NEW FLT ATTENDANT JUST OFF IOE. I MADE THE APCH BRIEFING AND STATED THAT WE WERE 10 MINS OUT AND FOR HER TO PREPARE THE CABIN FOR ARR. AT APPROX 8000 FT MSL SHE CAME IN WHILE THE CAPT WAS ON THE RADIO WITH MAINT AND TRIED TO GET HIS ATTN. I ASKED WHAT SHE WANTED AND SHE DEMANDED THAT WE CALL FOR 2 PAX BUSES. I TOLD HER WE WOULD TRY TO ACCOMMODATE HER REQUEST BUT SHE COULD NOT BE UP HERE NOW AND TO RETURN TO HER SEAT. ON THE ILS TO RWY 30R AT MSP JUST PAST THE OM JACKO; THE DOOR BURSTS OPEN AND SHE COMES RUNNING IN WITH A PAPER. I WAS TALKING TO THE TWR AND THE CAPT WAS FLYING THE APCH BY HAND. HE YELLED FOR HER TO GET OUT NOW. THIS DISTR ME FROM THE TWR INSTRUCTIONS AND THE CAPT FROM FLYING. LATER WE ASKED WHAT WAS IN HER HAND AND SHE SAID SHE WANTED TO GIVE US OUR PAX CONNECTIONS. HER ACTIONS SERIOUSLY ENDANGERED OUR FLT AS BOTH PLTS WERE DISTR IN A CRITICAL PHASE OF FLT IN CLOSE PROX TO THE GND. WE SPOKE WITH HER AFTER AND SHE SAID SHE UNDERSTOOD THE STERILE COCKPIT RULE BUT COULD GIVE NO REASON WHY SHE HAD TO COME IN. I FEEL THAT FLT ATTENDANTS NEED TO UNDERSTAND THE IMPORTANCE OF THIS RULE AND POSSIBLY HAVE SOME MORE TRAINING ON WHEN IT IS ACCEPTABLE TO ENTER THE FLT DECK.