OVER CTL CAUSES THE ELEVATOR TO BE TWISTED AND THE TAIL TIE DOWN RING TO BE BROKEN OFF.

Narrative

I WAS FLYING WITH A COMMERCIAL SINGLE AND MULTI-ENG INSTR RATED PLT. I AM PREPARING HIM FOR HIS CFI CHK RIDE. THE NIGHT OF JUN/XX/94 WE WENT FLYING TO PRACTICE NIGHT LNDGS; WITH AND WITHOUT THE LNDG LIGHT AS WELL AS EMER PROCS. IT WAS LATE AT NIGHT AND I HAD ALREADY HAD A LONG DAY WHICH INCLUDED TEACHING GND SCHOOL. I WAS MORE RELAXED THAN I WOULD HAVE BEEN WITH A STUDENT PLT. I WAS SHOWING HIM HOW TO TEACH NIGHT LNDGS TO HIS FUTURE STUDENTS. AFTER 3 SUCCESSFUL LNDGS; WE DECIDED TO DO ONE MORE. ON THIS ONE; I ASKED HIM TO SIMULATE AN ENG FAILURE BY PULLING THE THROTTLE TO IDLE AND LNDG. I TOLD HIM TO PULL THE PWR HIMSELF WHEN WE WERE IN A COMFORTABLE POS TO LAND. I HAD WARNED HIM ABOUT STALLING TOO HIGH AND HITTING THE RWY HARD. HE PULLED THE PWR TO IDLE AND; WHEN WE WERE ABOUT 10 FT OFF THE RWY; WE THOUGHT THAT WE WERE APCHING A STALL (WE WERE NOT). HE THEN VIOLENTLY PUSHED THE YOKE FORWARD ALL THE WAY. I WAS LIFTED OUT OF MY SEAT. I PANICKED AND GRABBED THE YOKE AND BEGAN PULLING BACK. AT ABOUT THE SAME TIME HE DID THE SAME THING. WE WERE BOTH PULLING BACK AND OVERROTATED AND HIT THE TAIL ON THE RWY BEFORE THE MAIN WHEELS TOUCHED. THE DAMAGE WAS: THE TAIL TIE-DOWN RING WAS KNOCKED OFF; AND A SLIGHT TWIST IN THE ELEVATOR DUE TO TOO MUCH CTL FORCE APPLIED BY MYSELF AND MY STUDENT. I WAS TIRED THAT NIGHT AND OVER ESTIMATED HIS FLYING ABILITIES AND WAS NOT PREPARED MENTALLY TO HAVE TO TAKE OVER THE CTLS. I SHOULD HAVE REACTED SOONER AND YELLED 'I GOT IT!'