ACR FLT CREW RECEIVES TERRAIN; TERRAIN WARNING WHILE PERFORMING LOC APPROACH TO RWY 33 AT JST. ILS WAS NOTAMED OUT OF SERVICE.

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WHILE ON ILS; LOC APCH TO RWY 33 IN JST FO WAS PF. WE WERE INFORMED BY BOTH OUR NOTAMS AND ATC THAT THE ILS WAS OUT ON RWY 33. WE ELECTED TO EXECUTE A LOC APCH TO RWY 33. THE APCH PROC WAS TO DSND TO 3000 FT AFTER THE FINAL APCH FIX. WE BROKE OUT OF THE CLOUDS AT ABOUT 6000 FT AND HAD VISUAL CONTACT WITH THE GND ALONG WITH ABOUT 5 MI OF FORWARD VISIBILITY. WHILE DSNDING TO 3000 FT I COMMENTED TO FO THAT THE RIDGE IN FRONT OF US APPEARED TO BE CLOSE TO OUR ALT. AT THAT TIME I TURNED ON THE TERRAIN AWARENESS AND NOTICED THAT THE TERRAIN WAS VERY CLOSE TO OUR ALT. I DOUBLE-CHKED THE STEP DOWN FIX AND CONFIRMED THAT IT WAS INDEED 3000 FT AND THAT WE HAD INDEED TUNED IN THE PROPER LOC FREQ. AT THAT TIME WE RECEIVED A TERRAIN TERRAIN; PULL-UP. FO TOOK IMMEDIATE ACTION AND INITIATED A CLB TO APPROX 3500 FT. THE GPWS WARNING CEASED AND WE CONTINUED THE APCH AND LNDG WITHOUT INCIDENT. IT WOULD APPEAR THAT THERE WAS A PROB WITH THE LOC OR PROC THAT CAUSED US TO COME TOO CLOSE TO THE RIDGE. OTHERWISE THERE MAY HAVE BEEN A PROB WITH THE ONBOARD EQUIP. UNSURE; IT WOULD APPEAR THAT WE FOLLOWED THE PROPER APCH PROC.