AN ACR MLG PIC ADMITS TO AN ALTDEV ALT OVERSHOT ON APCH AT NIGHT INTO DFW WITH A 500 FT CEILING. CFIT.

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ON APCH INTO DFW AIRFIELD; CLRED FOR ILS RWY 18R AT 3000 FT MSL. ESTABLISHED ON LOC INSIDE OF 10 MI; CLRED TO DSND TO 2400 FT MSL. BELOW GS; A GRADUAL DSCNT IS INITIATED. AT 1900 FT MSL IT IS REALIZED WE ARE INSIDE THE FAF BELOW GS; DSNDING. UPON RECOGNITION; A CORRECTION BACK TO GS IS INITIATED; AT WHICH TIME APCH CTL MAKES A RADIO CALL ADVISING OF LOW ALT WARNING. GS CAPTURED AND AN UNEVENTFUL SAFE LNDG IS MADE ON RWY 18R. CONTRIBUTING FACTORS: 1) BEGINNING OF BAD WX SEASON (NOT SPOOLED UP FOR INST APCH; BEEN DOING MANY VISUALS). 2) LONG DAY AND BEEN ON DUTY 4 DAYS. 3) DID NOT HAVE APCH CHART OUT. NOT ANTICIPATING LOW CEILINGS. 4) A GOOD BRIEFING HAD BEEN ACCOMPLISHED. 5) ASKED TO MAINTAIN 180 KTS TO FAF; A LITTLE FASTER THAN NORMAL. 6) CLRED TO LOWER ALT AT A CRITICAL POINT INSTEAD OF JUST INTERCEPTING GS AT STABLE ALT (3000 FT MSL). THE PROB WAS DISCOVERED BY PF. HOWEVER; A RADIO CALL CAME FROM CTLR SHORTLY AFTER CORRECTIVE ACTION HAD BEEN INITIATED. CORRECTIVE ACTION WAS TO ADD PWR AND RECAPTURE GS.