A CFI; INSTRUCTING IN A SENECA I; EXECUTED A GAR AFTER THE STUDENT TOUCHED DOWN HARD; CAUSING THE ACFT TO PORPOISE. THEY NOTICED NOTHING AND CONTINUED THE TRAINING SESSION. THEY DISCOVERED THE PROP STRIKE ON THE R PROP AFTER SHUTTING DOWN.

Narrative

DURING A MULTI-ENG INSTRUCTIONAL PERIOD; MY STUDENT; A PVT PLT WITH MORE THAN 500 HRS TOTAL TIME; LANDED A LITTLE HARD AFTER A FAIRLY NORMAL APCH. IN FACT; THERE WAS NOTHING THAT OCCURRED DURING THE APCH TO INDICATE THAT THE SUBSEQUENT LNDG WOULD BE SO PROBLEMATIC. AT THE POINT OF TOUCHDOWN; THE PLANE BOUNCED UP AND PORPOISED AT WHICH TIME I TOOK OVER THE CTLS AND ACCOMPLISHED A GAR. AFTER THE GAR; WE ACCOMPLISHED 3 ADDITIONAL TKOFS AND LNDGS; AS THERE WAS NO INDICATION; WHATSOEVER; THAT THE AIRPLANE HAD SUSTAINED A PROP STRIKE ON THE R PROP. IN FACT; THE AIRPLANE PERFORMED EQUALLY WELL AFTER THIS LNDG AS IT HAD PREVIOUSLY. THERE WAS NO VIBRATION AND ALL ENG GAUGES INDICATED NORMALLY. WE TAXIED TO THE RAMP AND ACCOMPLISHED THE SHUTDOWN CHKLIST. UPON DISEMBARKING THE AIRPLANE; WE WERE SHOCKED TO DISCOVER THAT THE TIPS OF THE R PROP HAD SUSTAINED DAMAGE. IN FOLLOW-UP DISCUSSION WITH THE MECH; HE INDICATED THAT THE PROP WAS DAMAGED BEYOND REPAIR. THE ENG WAS THOROUGHLY CHKED AND FOUND TO BE IN PERFECT CONDITION; IE; NO DAMAGE. SOME SCUFFING WAS NOTED ON BOTH SIDES OF THE NOSE GEAR TIRE.