Narrative:

During a multi-engine instructional period, my student, a private pilot with more than 500 hours total time, landed a little hard after a fairly normal approach. In fact, there was nothing that occurred during the approach to indicate that the subsequent landing would be so problematic. At the point of touchdown, the plane bounced up and porpoised at which time I took over the controls and accomplished a go around. After the go around, we accomplished 3 additional takeoffs and lndgs, as there was no indication, whatsoever, that the airplane had sustained a propeller strike on the right propeller. In fact, the airplane performed equally well after this landing as it had previously. There was no vibration and all engine gauges indicated normally. We taxied to the ramp and accomplished the shutdown checklist. Upon disembarking the airplane, we were shocked to discover that the tips of the right propeller had sustained damage. In follow-up discussion with the mechanic, he indicated that the propeller was damaged beyond repair. The engine was thoroughly checked and found to be in perfect condition, ie, no damage. Some scuffing was noted on both sides of the nose gear tire.

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Original NASA ASRS Text

Title: 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.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.