FLT CREW OF GLF4 FLY APCH TO 700 FT AGL WITHOUT PROPER ILS FREQ TUNED.

Narrative

NIGHT FLT FROM EWR TO MSP. CREW WAS VERY FATIGUED FROM TOUGH 4 DAY TRIP. WX FOR MSP FORECAST TO BE 2500 FT OVCST; 10 MI VISIBILITY. RWY 30L NOTAMED CLOSED. CREW MIND SET WAS LAND RWY 30R VISUAL APCH AIDED BY THE ILS. WHEN IN RANGE; ATIS INFORMED US THAT CEILING WAS 700 FT OVCST; VISIBILITY 10 MI; ILS APCH RWY 30R; GS OTS. THE APCH WAS BRIEFED AND RWY 30R LOC FREQ TUNED ON BOTH NAV RADIOS IN STANDBY POS. CREW ELECTED TO KEEP R SIDE IN FMS MODE FOR VERT GUIDANCE REF. VECTORED FOR TURN ONTO RWY 30R LOC. MADE WHAT SEEMED LIKE A NORMAL TURN ONTO THE LOC AND AT FAF STARTED DSCNT TO MDA. DSCNT RATE AND ALT CALLOUTS WERE GIVEN BY PNF. THE APCH SEEMED NORMAL UNTIL WE BROKE OUT OF THE CLOUDS AT APPROX 700 FT AND REALIZED WE WERE LINED UP QUITE A BIT L (S) OF RWY 30R. WE CORRECTED OUR ALIGNMENT AND LANDED RWY 30R WITH NO FURTHER DIFFICULTY. SUBSEQUENTLY; ON THE RAMP DURING POSTFLT; WE MADE THE SHOCKING DISCOVERY THAT WE HAD NOT CYCLED THE RWY 30R LOC FREQ FROM STANDBY TO THE ACTIVE POS ON THE NAV RADIOS. THIS PROB OCCURRED DUE TO A VERY TIRED CREW AND THE SUBSEQUENT OMISSION OF SOME OF OUR BASIC SOP'S. THE OLD SAYING 'THE MORE TIRED WE GET THE DUMBER WE GET' HAS A LOT OF TRUTH TO IT.