AN INSTRUCTOR PLT RPTS THAT HIS STUDENT WHO HAD A HISTORY OF LNDG PROBS HAD A LNDG INCIDENT DURING ONE OF HIS INSTRUCTIONAL FLTS.

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I WAS CONDUCTING TRAINING WITH A PLT WHO CLAIMED HE HAD TO TAKE A CHK RIDE WITH THE LCL FSDO BECAUSE OF A LNDG ACCIDENT IN WHICH HE HAD LOST CTL OF HIS OWN C170 WHICH WAS DESTROYED. MY TRAINING CONSISTED OF WORKING WITH THIS PLT ON BASIC ACFT CTL -- SLOW FLT STALLS; ETC; ON HIS FIRST FLT; THEN SEVERAL FLTS (3) IN WHICH WE CONCENTRATED ON 3-POINT AND THEN WHEEL LNDGS. WHILE I WAS ABLE TO TALK THE PLT THROUGH SEVERAL LNDGS THAT WERE ACCEPTABLE; HE COULD NOT LAND CONSISTENTLY. AT LEAST ONCE DURING EACH SESSION I HAD TO TAKE CTL OF THE ACFT TO PREVENT DAMAGE - - (USUALLY A BAD BOUNCE ON LNDG). DURING THE FINAL FLT I HAD TO TAKE CTL AFTER THE FIRST LNDG DUE TO PORPOISING. THE FOLLOWING 2 LNDGS (ALL WHEEL LNDGS DURING THIS FLT) WERE ACCEPTABLE AND I THOUGHT HE HAD BEGUN TO SEE THE 'LIGHT.' ON THE FINAL LNDG THE APCH WAS GOOD (FINALLY) HOWEVER; WHEN THE ACFT WAS AT APPROX 3-5 FT ABOVE THE RWY THE STUDENT ABRUPTLY PUSHED THE STICK FORWARD. THE ACFT STRUCK IN A NOSE LOW ATTITUDE; HITTING THE PROP AND BOUNCING HARD OFF THE LNDG GEAR. I DO NOT KNOW HOW TO PREVENT THIS TYPE OF ACCIDENT IF ALLOWING ANOTHER PLT TO TRY TO LAND. I WAS VERY NERVOUS ABOUT THIS PLT'S FLYING AND ALWAYS HAD MY HANDS ON THE CTLS DURING THE TKOF AND LNDG PHASES OF FLT. HOWEVER; DUE TO THE LOW ALT AND THE ABRUPT VIGOR OF THE PLT'S CTL INPUT I WAS UNABLE TO PREVENT THE ACFT FROM STRIKING THE RWY.