B767 FLT CREW EXECUTES AN UNSTABILIZED APCH; GETS SLOW WITH A HIGH ANGLE OF ATTACK; TAIL STRIKE OCCURS.

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PREFLT; PRE-TKOF; AND CLBOUT WERE NORMAL. CRUISE WAS NORMAL AT FL340. APCH AND LNDG PROCS WERE BRIEFED IN DETAIL INCLUDING GAR PROCS BEFORE TOP OF DSCNT. STARTED DSCNT APPROX 105 NM FROM TPE. INITIAL APCH WAS HIGH DUE TO ATC. TPE APCH ADVISED 'NO SPD RESTRS' AT APPROX 16000 FT. COMPLIED WITH HIGH SPD DSCNT. ACFT WAS NOT STABILIZED AT 1000 FT AND AT 500 FT STILL WAS NOT STABILIZED. I CALLED FOR GAR OR TAKING OVER THE ACFT. FO REPLIED THAT HE COULD MAKE A NORMAL LNDG. BASED ON KNOWING HIM AS A VERY GOOD PLT; AND HIS EXTENSIVE EXPERIENCE; I ASKED HIM IF HE WAS SURE. HE ANSWERED YES AND CONTINUED. SOMEWHERE AROUND 300 FT; HE WENT BELOW GLIDE PATH AND THE BELOW GS ADVISORY WAS ANNOUNCED. HE IMMEDIATELY TRIED TO CORRECT THE SITUATION. AT ABOUT 200 FT; WE WERE ON GLIDE PATH AND I NOTICED THE SPD WAS 138 KTS (LNDG SPDS WERE VERIFIED AND POSTED AT 223 KTS; 183 KTS; AND 143 KTS). I ANNOUNCED FOR A SPD CORRECTION AND HE LOOKED INSIDE THEN I WENT LOOKING OUT. LNDG WAS SMOOTH WITH HIGHER THAN NORMAL PITCH UP. JUST BEFORE TOUCHDOWN; I PUSHED THE YOKE FORWARD AND AFTER TOUCHDOWN; SPD WAS APPROX 124 KTS. LNDG WAS SMOOTH BUT FELT DIFFERENT. TAXI IN WAS NORMAL. ACFT MAINT LOG WAS WRITTEN UP FOR POSSIBLE TAIL STRIKE. MECH WAS NOTIFIED AND IT WAS DISCOVERED THAT THE TAIL SKID WAS SCRAPED. SUBSEQUENT INSPECTION REVEALED NO STRUCTURAL DAMAGE. IN SUMMARY; AS PIC OF THIS FLT; I DID NOT USE MY BEST JUDGEMENT TO IMPLEMENT THE GAR AND PREVENT THIS CHAIN OF EVENTS. SUPPLEMENTAL INFO FROM ACN 692279: I WAS RUSHED THROUGHOUT THE SECOND HALF OF THE APCH. I TRIED TO COMPLY WITH THE PROCS FOR A STABILIZED APCH. I WAS OUT OF SOME PARAMETERS BUT THOUGHT I COULD CORRECT THEM. I DID NOT SOLVE THE AIRSPD PROB OF TOO HIGH INITIALLY. THE DECREASE IN AIRSPD AS WE APCHED THE TOUCHDOWN ZONE MAY HAVE BEEN CAUSED BY MY HOLDING BACK THE THROTTLES INADVERTENTLY. I DO NOT RECALL NOR DID I CALL OUT 'AUTOTHROTTLES OFF.' I SHOULD HAVE ALLOWED THE CAPT TO TAKE THE ACFT OR COMPLETE THE GAR.