CONFUSION ON THE FLT DECK DURING IAP ILS APCH.

Narrative

WE WERE INBOUND FROM GDL AND CLRED TO TURN L TO HDG MAINTAIN 2000 FT TILL ESTABLISHED; CLRED FOR THE ILS 27 APCH AT IAH. THE CAPT TUNED AN ILS FREQ INTO THE FO'S RADIO. THE CAPT CALLED FOR THE 'APCH CHKLIST' AND RESPONDED 'TUNED AND IDENTIFIED' TO THE QUERY 'RADIOS.' THE FO (WHOSE LEG IT WAS) OVERSHOT THE LOC; AND THE CAPT RPTED THE OVERSHOOT TO ATC. ATC THEN ASKED IF WE WOULD LIKE A GAR. THE CAPT SAID NO; WE WOULD MAKE IT. IT WAS NOTICED THAT THE WRONG ILS FREQ HAD BEEN TUNED IN; AND THE APPROPRIATE FREQ THEN REDIALED. BOTH THE LOC AND GS NEEDLES WERE THEN PEGGED; L AND DOWN RESPECTIVELY. THE FO CORRECTED COURSE TO APPROX 50 DEGS L TO INTERCEPT THE LOC. THE CAPT SAID TO THE FO; THAT HE COULD GO AHEAD AND DSND TO 1500 FT. GEAR DOWN AND FULL FLAPS WERE CALLED FOR AND DELIVERED. I SAID WE WERE NOT 'ESTABLISHED.' WE STILL HAD A PEGGED 'L' LOC AND A PEGGED 'DOWN' GS. WE CONTINUED TO DSND. ATC ASKED AGAIN IF WE SHOULD GAR SINCE WE WERE INSIDE THE MARKER. THE FO SAID AGAIN WE SHOULD GAR AND I CONCURRED VOCALLY. THE CAPT STILL SUGGESTED THAT THE APCH COULD BE SALVAGED. THE FO SAID HE WAS GOING AROUND; AND CALLED FOR CLB PWR. HE DID NOT REMOVE HIS HANDS FROM THE THROTTLES; NOR DID HE PUSH THE THROTTLES TO A CLB PWR SETTING. I THEN PUSHED THE THROTTLES FULL FORWARD WITH THE FO'S HAND STILL ON THEM TO THE MAX PWR AND CALLED FOR THE GEAR UP. THE CAPT TOLD ATC WE WERE GOING AROUND AND THE ATC CLRNC WAS 'CLB AND MAINTAIN 2000 FT.' SHORTLY THEREAFTER ATC SAID 'MAINTAIN 3000 FT SINCE YOU'RE ALREADY PASSING THROUGH 2500 FT.' THE CAPT RESPONDED WE WOULD GO BACK TO 2000 FT. WE DID SO. ATC DID NOT SEEM TO HAVE A PROB WITH THE INCURSION INTO UNAUTH AIRSPACE. IT IS MY OPINION; BUT UNVERIFIED; THAT THE CAPT TRIED TO RECALL THE LOC FREQ TO A KNOWN RWY WITHOUT CONSULTING THE APPROPRIATE CHART; AND WAS MISTAKEN. THE FO DID NOT REALLY HEAR THE CAPT WHEN QUERIED TO VERIFY THE FREQ; AND ASSUMED THAT THE CAPT WAS CORRECT (DESPITE THIS PARTICULAR CAPT'S PREVIOUS HISTORY). WHEN THE INCORRECT FREQ WAS CORRECTED; THE APCH WAS TOO FAR GONE TO BE RETRIEVED; AND THE PLTS FLYING WERE LATE AND INDECISIVE IN INITIATING A GAR.