STUDENT PLT LOST DIRECTIONAL CTL OF ACFT DURING A LNDG IN GUSTY XWINDS RESULTING IN THE ACFT DEPARTING THE SIDE OF THE RWY. THIS WAS A DUAL INSTRUCTION TRAINING FLT.

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PRESOLO TRAINING FLT (DECISION NOT TO SOLO STUDENT BECAUSE OF WINDS/AERO CLUB RESTRICTIONS). WIND RPTS FROM WX SOURCES DID NOT JIBE WITH WINDSOCKS (6-8 KTS RPTED VERSUS 10-15 KTS OBSERVED). DEPARTED ADW ON A VFR FLT PLAN; HYDE DEP. FLEW 5-6 MI S OF W32 TO WARM-UP WITH TURNS AND SLOW FLT. STUDENT IS A STRONG PERFORMER. RETURN TO W32; ENTER TFC PATTERN (APPROX 10 DEG WCA TO CORRECT DRIFT; PARALLEL RWY). FIRST APCH DEVELOPING NICELY DESPITE GUSTY WINDS. ACFT DRIFTED L OF CTRLINE APCHING THRESHOLD; NOSE SLIGHTLY L OF CTR. APPROX 10 FT; I COMMANDED 'GAR.' STUDENT RETARDED THROTTLE INSTEAD OF INCREASING PWR. RAPID DSCNT TO RWY ('FIRM' LNDG) -- THEN STUDENT APPLIES FULL THROTTLE AND FULL BRAKES. WE ARE SKIDDING OFF THE L EDGE -- I MANAGE TO FORCE THE RUDDER/STEERING L TO MISS A RWY LIGHT; CONTINUE OUR DECELERATION (STUDENT NOW RELINQUISHES CTLS TO ME) IN THE SOD AND UP A RISE TO A PARKING AREA. HAPPENS VERY QUICKLY. WE SECURE AIRPLANE AND INSPECT FOR DAMAGE. CHAIN OF CUSTODY: PROBABLY A BAD DECISION TO TRAIN IN GUSTY WINDS. (STUDENT THINKS I SAVED HIM A BAD EXPERIENCE LATER). I SHOULD HAVE KEPT A CLOSER GUARD ON THE CTLS -- ANTICIPATING POTENTIAL CONFUSION OVER THE THRESHOLD. THE STUDENT DOESN'T RECALL MY 'GAR' CALL. BUT HIS RESPONSE IS TYPICALLY 'STUDENT' -- 'WHOOPS! DID I DO THAT?' IF I HAD KEPT THE ACFT AIRBORNE; THERE'D BE NO TESTIMONIALS (RUBBER TRACKS AND GROOVES IN THE GRASS) TO WINCE ABOUT. I THINK I RESOLVED THE 'ANTI- SKID OFF' PROBLEM SUCH THAT BOTH OF US CAN REDEFINE SOME 'EDGES OF THE ENVELOPE(S).' RESOLVE: TRAINING IS A GOOD IDEA; KEEP CONDITIONS CONSERVATIVE; EMBELLISH WITH 'DEMONSTRATIONS' HANDS ON OR NEARBY; PROVISIONAL PLANNING -- ANYTHING CAN HAPPEN TO ME.