INSTRUCTIONAL FLT ENTERS CLASS B AIRSPACE WITHOUT CLRNC ON A PRACTICE ILS MISSED APCH AT UNDERLYING ARPT.

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WE HAD USED DEN APCH FOR VECTORS FROM APA TO FRONT RANGE ARPT TO DO SOME PRACTICE INST APCHS. WE WERE VECTORED AT 7500 FT MSL. APCH WAS BUSY AND MY STUDENT HAD ASKED THEM TO REPEAT CALLS A COUPLE OF TIMES (DUE TO TRYING TO TUNE AN OLD ANALOG ADF RECEIVER). SO AFTER THE FIRST ILS RWY 26 APCH; WE ELECTED TO NOT RETURN TO DEN APCH. (THEY HAD SAID 'RADAR SVCS TERMINATED; FREQ CHANGE APPROVED.') WE WANTED TO DO THE PUBLISHED MISSED APCH; WHICH CALLS FOR A CLBING L TURN TO 7100 FT. (IT ALSO CALLS FOR A CLB STRAIGHT AHEAD TO 6000 FT BEFORE TURNING; BUT THAT WOULD HAVE TAKEN US INTO THE DEN APCH CORRIDOR FOR THE N/S RWYS. SO I HAD HIM INITIATE THE L TURN PRIOR TO REACHING 6000 FT.) BECAUSE HE HAD TROUBLE TRACKING THE GS; AND BECAUSE WE HAD BEEN VECTORED AT 7500 FT; I ASKED HIM TO CLB TO 7500 FT BEFORE CHKING THE DEN CLASS B AIRSPACE TERMINAL AREA CHART. THE FLOOR OF THE CLASS B AIRSPACE WAS 7000 FT. THERE WERE 2 PROBS. FIRST WAS THAT I SHOULD HAVE CHKED THE TERMINAL AREA CHART FOR THE FLOOR OF THE CLASS B AIRSPACE BEFORE REQUESTING THAT MY STUDENT CLB TO THAT ALT. THE SECOND PROB IS THAT THE PUBLISHED 'MISSED APCH' PROC TAKES YOU INTO CLASS B AIRSPACE. TFC PATTERN ALT AT FTG IS 6500 FT. MANY PLTS USE THE TECHNIQUE OF OVERFLYING THE ARPT 500 FT ABOVE TFC PATTERN ALT TO CHK THE WINDSOCK. YOU COULDN'T DO THIS AT FTG WITHOUT GETTING INTO THE CLASS B AIRSPACE. BOTH OF THESE POINTS (MISSED APCH PROC; OVERFLYING) SUGGEST THAT THE CLASS B AIRSPACE SHOULD BE AT LEAST 500 FT HIGHER.