AN SF340 FLC LANDS THEIR ACFT ON A SNOW AND ICE COVERED RWY WHILE IT IS OCCUPIED BY A SNOW PLOW AT PQI; ME.

Narrative

I WAS ON THE 3RD DAY OF A 4 DAY TRIP. I HAD TO RPT THAT DAY AT AB00. I WAS ON THE 4TH AND LAST LEG OF THE TRIP; IN IMC WITH CLR ICE BUILDING UP ON MY AIRPLANE WITH THE AUTOPLT INOP. THE CTR CTLR TURNED US IN HIGH AND TIGHT FOR THE APCH AND THE RWY WAS SNOW AND ICE COVERED WITH WHITEOUT CONDITIONS. ZBW ON 124.75 CLRED FLT FOR THE ILS RWY 1 APCH TO PRESQUE ISLE ARPT. WE WERE AT 3200 FT MSL AT 1-2 MI FROM THE FAF. WE WERE VECTORED HIGH ON THE GS SO WE INCREASED OUR RATE OF DSCNT TO INTERCEPT THE GS. THE AUTOPLT WAS MEL'ED INOP; SO I HAD TO HAND FLY THE APCH USING ONLY THE FLT DIRECTOR. AT 3200 FT TO 1000 FT WE WERE ENCOUNTERING FREEZING RAIN AND PICKING UP CLR ICE ON THE ACFT. AFTER THE APCH CTLR (ZBW) CLRED US FOR THE APCH; HE NEVER SWITCHED US TO PRESQUE ISLE CTAF ON 122.8. WE; THE CREW; ALSO FORGOT TO GO TO THE CTAF. AFTER LNDG ON RWY 1; THE FO AND I SAW A PLOW TRUCK APPROX 3/4 MI DOWN THE RWY ON THE L-HAND SIDE PLOWING SNOW DRIVING AWAY FROM US. I MANAGED TO STOP THE ACFT APPROX 1500 FT BEHIND THE PLOW TRUCK AND EXITED THE RWY AT TXWY C AND PULLED UP THE CTAF AND ANNOUNCED ON THE RADIO THAT FLT WAS CLRING RWY 1 AT PRESQUE ISLE. BY THE TIME WE SAW THE TRUCK WE HAD ALREADY LANDED ON THE RWY AND FELT THAT DOING A GAR ON A SNOW AND ICE COVERED RWY AND GOING BACK UP INTO FREEZING RAIN WOULD BE A LOT MORE DANGEROUS THAN JUST STOPPING BEHIND THE PLOW TRUCK WHICH WAS DRIVING AWAY FROM US ANYWAY.