ARPT WX MINIMUMS FOR LNDG COMPLETELY BUSTED IN CFTT OR CFIT DURING IAP LOC APCH.

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THERE WERE 3 PLTS ON BOARD. THE PIC WAS A 4000 HR CHARTER PLT. THE R FRONT PAX WAS A CFII WITH APPROX 550 HRS. I WAS SITTING IN THE BACK SEAT AND AM A CFII WITH 450 HRS. THE PIC APPEARED TO BE A LITTLE SLOW ON HIS IFR PROCS (FORGETTING TO SET XPONDER UNTIL AFTER TKOF AND REMINDED BY CTR; MISSED A FEW RADIO CALLS; DSNDING BELOW PUBLISHED MINIMUMS; I.E.; APPEARED TO BE RUSTY). ON THE INITIAL SEGMENT OF THE APCH I INFORMED THE PIC THAT THE GS ON THE ILS RWY 16R APPEARED TO BE INOP. THAT RAISED MINIMUMS TO 1100 FT MSL. ON THE APCH WE DSNDED IMMEDIATELY FOR 1100 FT LOOKING FOR THE SURFACE. UPON REACHING 1100 FT THE PIC CONTINUED DOWN BELOW THIS ALT. WE WERE ON THE LOC SO I FELT FAIRLY COMFORTABLE WITH DSNDING A BIT LOWER SINCE I KNEW THERE WAS A SMALL VALLEY LEADING TO THE RWY. I EXPECTED HIM TO LEVEL AT 765 FT (THE ILS MINIMUMS) BUT HE CONTINUED ON THROUGH TO APPROX 550-630 FT MSL. (I'M NOT SURE WHICH; THE OTHER PAX AND I DISCUSSED IT AND I BELIEVE I SAW 550 FT AS THE LOWEST INDICATION WHILE HE SAID 630 FT.) EITHER WAY THE ARPT ELEVATION IS 606 FT. AS WE REACHED 765 FT; I REALIZED THE PIC WAS NOT INITIATING A GAR OR LEVEL OFF PROC. I STARTED TO TAP THE CFII IN THE FRONT SEAT RATHER THAN SAYING ANYTHING ON THE INTERCOM. AS WE REACHED 550 FT I NOTICED THE OUTLINES OF TREES BEING BACKLIT AT OUR ALT AND STARTED YELLING FOR A CLB. OBVIOUSLY WE MADE IT. WE CLBED TO 800 FT; BROKE OUT RIGHT OVER THE NUMBERS; AND LANDED. THE PROB AROSE BECAUSE WE HAD A PIC WHO WAS NOT AS CURRENT AS HE SHOULD HAVE BEEN. WE ALSO HAD 2 PEOPLE (CFII) WHO DID NOT SPEAK UP WHEN WE SHOULD HAVE. THE DISCOVERY WAS MORE OR LESS IMMINENT. WE WERE OBVIOUSLY TOO LOW AND THE CLB OUT CORRECTED IT. I BELIEVE THAT ALL 3 PLTS WERE AT FAULT FOR NOT BEING MORE ASSERTIVE AND AWARE. WE PUSHED OUR LIMITS PAST THE POINT OF SAFETY. LUCKILY; WE GOT OUT OF IT ALL RIGHT.