SMT LANDS WITH THE LNDG GEAR RETRACTED.

Narrative

UPON ENTERING DOWNWIND; WE LOWERED 20 DEG FLAPS AND EXTENDED THE LNDG GEAR NORMALLY. ONLY THE L MAIN LNDG GEAR LIGHT WAS VISIBLE FROM MY R SEAT AND I NOTED THAT THE GEAR SELECTOR WAS DOWN. THE GEAR LIGHTS WERE NOT VISIBLE ON FINAL APCH DUE TO THE LOW SUN ANGLE; THE SUN SHINING BRIGHTLY INTO THE COCKPIT ONTO THE GEAR LIGHTS. I COULD SEE THAT THE GEAR SELECTOR WAS NOT UP. TURNING ONTO THE BASE AND FINAL APCH; I CHKED THAT THE GEAR SELECTOR WAS NOT UP; NO WARNING HORN WAS SOUNDING OR LIGHT ILLUMINATED. STUDENT WAS MOVING THE THROTTLES UP AND DOWN; NEVER STABILIZING THE APCH PROPERLY. THIS WAS THE FOURTH APCH; I DECIDED NOT TO HAVE THIS BE A SIMULATED SINGLE ENG APCH/LNDG SINCE SHE HAD BEEN UNABLE TO MAINTAIN DIRECTIONAL OR LATERAL CTL WITHOUT MY ASSISTANCE ON THE PREVIOUS LNDGS. SHE WAS ROLLING THE ACFT HEAVILY AND USING INSUFFICIENT RUDDER. WE WERE LNDG SOMEWHAT LONG; I HAD HER MAINTAIN A LOW PWR SETTING (APPROX 12 INCHES) TO PRACTICE USING THE RUDDER. I THEN SUGGESTED GOING AROUND BUT NOTICED THAT SHE HAD CONTINUED TO REDUCE PWR AND BEGUN TO FLARE. AT THIS POINT; WE STILL HAD ABOUT 2500 FT REMAINING; SO I TOLD HER TO GO AHEAD AND COMPLETE THE LNDG. I HAD TO HELP HER WITH BOTH THE RUDDER AND LATERAL CTL TO COMPENSATE FOR THE XWIND OR WE WOULD HAVE TOUCHED DOWN IN A CRAB. AT THIS POINT THE ACFT TOUCHED THE GND AND BEGAN TO SKID; THE GEAR BEING UP. AT NO TIME WAS A WARNING HORN HEARD OR A LIGHT OBSERVED BY ANYONE IN THE ACFT.