HARD LNDG DURING SHORT FIELD LNDG PRACTICE.

Narrative

DURING A TRAINING FLT; MY STUDENT (AN MEI APPLICANT) AND I DECIDED TO PRACTICE SHORT FIELD LNDGS. WE ARRIVED AT X59 ON A 45 DEG DOWNWIND ENTRY TO RWY 32. ESTIMATED WIND WAS APPROX 270 DEGS AT 15 KTS. THE APCH TO LNDG WAS EXECUTED ON TARGET -- PROPER AIRSPD AND ALTS. ON FINAL; SLIGHTLY PRIOR TO OUR AIMING POINT; THE ACFT EXPERIENCED NOTICEABLE SINK. WE WERE THEN OVER THE LNDG SURFACE AT APPROX 30 FT AGL. ADDITION PWR WAS APPLIED TO SLOW THE RATE OF DSCNT. AS DSCNT RATE CONTINUED TO DECREASE; STUDENT VERBALIZED 'GOING AROUND.' IMMEDIATELY THEREAFTER; STUDENT REMOVED ALL PWR AND SAID; 'I THINK WE CAN MAKE IT.' SHE THEN ATTEMPTED TO ARREST DSCNT BY GREATLY INCREASING THE PITCH ALT. I REAPPLIED PWR AS QUICKLY AS POSSIBLE; BUT A HARD LNDG WAS MADE. ACFT TOUCHED DOWN STRAIGHT AND IN A FLARED ALT. POSTFLT INSPECTION REVEALED R MAIN GEAR SUFFERED DAMAGE AND WAS ALMOST DETACHED. MILD DAMAGE OCCURRED TO L MAIN GEAR. NO APPARENT DAMAGE TO NOSE GEAR. 2 MAIN CONTRIBUTORS: 1) TREES SURROUNDING RWY THRESHOLD MAY HAVE CAUSED A CHANGE IN WIND SPD AND DIRECTION. I SHOULD HAVE RECOGNIZED THE POSSIBILITY OF SINK AND BEEN MORE PREPARED. 2) I PLACED TOO MUCH TRUST IN THE STUDENT'S DECISION TO GO AROUND. NO MATTER WHAT THE SKILL LEVEL OR HOW MANY RATINGS THE STUDENT MAY POSSESS; HE/SHE IS STILL THE STUDENT. AS THE INSTRUCTOR PLT; I WILL DEFINITELY KEEP MY HAND CLOSER TO THE THROTTLE NEXT TIME.