A B737-700 CAPT AND AN HGS APCH INTO MCI LOSES SITUATIONAL AWARENESS AND IS STILL EXTENDING FLAPS TO LNDG SETTING WHEN THEY BREAK OUT AT 500 FT AGL.

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AIII HGS APCH BRIEFED TO RWY 1R AT MCI. WX WAS ABOUT 500 FT AND 3 MI VISIBILITY. INTERCEPTED GS AT 3000 FT MSL AND FOLLOWED IT DOWN IN HGS MODE. SOMEWHERE DURING THE SUBSEQUENT APCH I LOST AWARENESS OF OUR ALT IN RELATION TO THE FIELD ELEVATION. CONFIGN WENT FROM FLAPS 5 DEGS; GEAR DOWN; FLAPS 15 DEGS; THEN FLAPS 30 DEGS (BRIEFED AS FINAL FLAPS). ABOUT THE TIME I CALLED FOR FLAPS 30 DEGS WE WERE BREAKING OUT AND THE FLAP CONFIGN WARNING WENT OFF (AS FLAPS WERE IN TRANSIT FROM 15 DEGS TO 30 DEGS). I WAS TOTALLY SURPRISED. WHILE IN THE WX; I WAS THINKING WE WERE JUST APCHING 1000 FT AGL! I CONTINUED THE LNDG UNEVENTFULLY AND PONDERED THIS EVENT UNTIL WE REACHED HOME TODAY. THE RPT IS BEING SUBMITTED NOW BECAUSE I JUST REALIZED WE BROKE PROC AND I WANT TO CALL TO ATTN THE PROCEDURAL BREAKDOWN I COMMITTED BY NOT PROPERLY MAINTAINING MY SITUATIONAL AWARENESS; NOT BEING CONFIGURED FOR A 'STABILIZED APCH;' AND NOT GOING AROUND IN A 'MESSED UP SITUATION.' BY THE TIME I REALIZED I WAS 'OFF' BY 1000 FT IN MY 'MENTAL ALTIMETER;' WE WERE IN THE ROUND OUT AND FLARE. MY MISTAKE TO LAND! MY FO AND I TALKED AT LENGTH ABOUT CALLOUTS AND OUR PROCS TO CORRECT DEVS. HE DID NOT REALIZE HOW 'MESSED UP' I WAS DURING THIS APCH AND WATCHED IT HAPPEN! HE IS AN EXCELLENT PLT AND I THINK THIS REALLY SURPRISED HIM AND WILL GIVE HIM AN APPRECIATION TO NOT 'TRUST' ANY SITUATION. SUPPLEMENTAL INFO FROM ACN 706374: BRIEFED AN AIII HGS APCH (NOT REQUIRED) TO RWY 1R IN MCI. WX WAS IMPROVING (APCH CTL) FROM ATIS RPT OF 300 DEGS; 2 MI. VECTORED TO FINAL AT 3000 FT MSL AND ASKED TO HOLD 170 KTS TO THE MARKER. INTERCEPTED GLIDE PATH WITH FLAPS 5 DEGS (MASI MINIMUM SPD APPROX 160 KTS). ABOUT HERE I REALIZE WE ARE 'BEHIND' THE ACFT AND POINT OUT WE ARE 6 DME. AFTER ANOTHER MI OR SO; THE CAPT CALLS FOR LNDG GEAR AND FLAPS 15 DEGS. BECAUSE WE ARE REMAINING ON THE GS; THE ACFT IS NOT SLOWING MUCH. AT ABOUT THIS POINT; I START TO FIXATE ON THE AIRSPD AND THE GS. I MISS THE 1000 FT CALL (KEY ERROR). SOMEWHERE AROUND THAT POINT; THE CAPT CALLS FOR FLAPS 30 DEG. I INITIALLY MOVE THE FLAPS TO 25 DEGS AND EVENTUALLY TO 30 DEGS. AT APPROX 500 FT AGL; WE BREAK OUT OF THE WX AND TRANSITION TO A VISUAL LNDG. SIMULTANEOUSLY; WE RECEIVED A 'PULL UP; TOO LOW' WARNING. I CONSIDERED IT; BUT FAILED TO DIRECT A GAR. I ALSO MISSED THE 500 FT AND 500 FT CALLOUTS. WE LANDED LONG BUT HAD NO TROUBLE STOPPING THE ACFT. I HAVE FLOWN WITH THIS CAPT PREVIOUSLY FOR A MONTH AND A 3-DAY LAST WK. HE IS AN EXCELLENT PLT AND I HAVE NEVER SEEN HIM COME CLOSE TO FALLING BEHIND THE ACFT! I THINK MY MINDSET/COMFORT LEVEL ALLOWED ME TO LET THIS APCH PROCEED FARTHER THAN IT SHOULD. ALTHOUGH NOT CHARACTERISTIC OF THIS CAPT TO 'PRESS;' I NEVER REALIZED HIS SITUATIONAL AWARENESS WAS OUT THE WINDOW AND WAS 1000 FT BEHIND THE ACFT. SHORTLY AFTER HIS DISAPPEARANCE; THOUGH; MY SITUATIONAL AWARENESS FOLLOWED! BY MISSING MY CALLOUTS; I CONTRIBUTED TO HIS FAILING SITUATIONAL AWARENESS INSTEAD OF HELPING IT. I SHOULD HAVE DIRECTED A GAR AT 1000 FT AND AGAIN ON SHORT FINAL. IN 6 YRS HERE; I HAVE NOT EXPERIENCED ANYTHING LIKE THIS AND IT WAS A TRUE 'WAKE UP' CALL. I WILL NEVER ASSUME THE PF IS 'TOTALLY AWARE' AND WILL BE DIRECTIVE WHEN REQUIRED.