INSTRUCTOR WITH STUDENT PLT ALLOWS A SIMULATED ENG OUT APCH TO GET TOO LOW ON NIGHT FLT.

Narrative

I PULLED THE THROTTLE TO THE IDLE POS TO SIMULATE AN ENG FAILURE ACROSS FROM THE TOUCHDOWN POINT ON DOWNWIND FOR RWY 26 AT PIQUA (I17). THE STUDENT FAILED TO MAINTAIN BEST GLIDE SPD AND HESITATED TO TURN DIRECTLY TOWARD THE LNDG THRESHOLD. THIS COMBINATION CAUSED THE APCH PATH TO BE MUCH LOWER THAN I WOULD HAVE LIKED TO SEE AS WE NEARED THE RWY THRESHOLD. SINCE THIS WAS A NIGHT FLT AND I THEREBY WAS UNABLE TO CLRLY SEE OBSTRUCTIONS; I ASKED THE STUDENT TO INITIATE A GAR. ONCE AGAIN; THE STUDENT HESITATED TO EXECUTE THE PROC UNTIL WE WERE APPROX 1200 FT MSL (200 FT AGL) SLIGHTLY TO THE L OF THE RWY 26 CTRLINE AND SLIGHTLY SHORT FOR THE THRESHOLD. THIS POS MADE ME FEEL VERY UNCOMFORTABLE; AND IN THE FUTURE I WILL NOT ALLOW A STUDENT TO DSND BELOW WHAT I FEEL IS A REASONABLE AND SAFE GLIDE PATH FOR THE RWY IN USE. NOR WILL I HESITATE TO SEIZE CTL OF A DETERIORATING SIT. WHEN IT COMES RIGHT DOWN TO IT; IF THE SIT DOESN'T FEEL RIGHT; IT PROBABLY ISN'T. NEXT TIME; I'LL LISTEN TO THOSE FEELINGS AND RECOVER SOONER.