AN ACR LTT CREW GOT LOW ON THEIR LOC APCH BECAUSE THE CAPT THOUGHT THAT THEY HAD GONE PAST THE OM WHEN IN FACT THEY WERE NOT YET THERE.

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WE WERE CLRED TO MAINTAIN EITHER 3000 MSL OR 2100 MSL UNTIL ESTABLISHED. THINGS APPEARED NORMAL; HOWEVER; I EXPECTED A R TURN AROUND TO THE FINAL. AS I STARTED TO PERFORM THE LNDG CHKLIST ITEMS; THE PROB OCCURRED. AS I REACHED FOR THE CHKLIST; I NOTICED ABOUT 1500 FPM DSCNT RATE PASSING 1200 MSL. I ASKED WHERE WE WERE GOING; THAT I HAD NOT HEARD AN OM BEACON. CAPT REPLIED WE WERE 6.1 DME (A REF TO FALOW OM EXCEPT BOTH NAV WERE TUNED TO ISOP LOC; NO BEARING INFO FROM SDZ AVAILABLE). I NOW HAD TO RETHINK AND MAKE SURE I WAS CORRECT (I WAS). ABOUT THE SAME TIME; FAYETTEVILLE APCH CALLED TO ASK ABOUT OUR ALT AND ISSUED A TERRAIN ALERT. WE PROCEEDED TO SOP AND LANDED WITHOUT FURTHER PROBS. IN FUTURE; BOTH PLTS SHOULD CALL OUT THE FINAL APCH FIX INBOUND (I GENERALLY DO). I FELT AS THOUGH I PERFORMED PROPERLY AS A CREW MEMBER; BUT WE STILL COULD HAVE CRASHED. A MORE NORMAL DSCNT RATE WOULD HAVE GIVEN ME MORE TIME TO NOTICE THE ERROR. THE ONLY THING I FELT I SHOULD HAVE DONE IS CALLED FOR A MISSED APCH AS SOON AS I SAW OUR ALT.