T34 ACFT ON TRAINING FLT. INSTRUCTOR PLT DEMONSTRATING LNDG FROM REAR COCKPIT; AFFECTED BY XWIND DEPARTED THE SIDE OF THE RWY DAMAGING ACFT.

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ON THE ABOVE DATE MR X AND I DEPARTED THE MONTEREY ARPT AT APPROX AX45. IT WAS MR X'S MAIDEN FLT IN A T34. AS A RESULT HE WAS IN THE FRONT SEAT AND I WAS IN THE REAR SEAT. WE FLEW TO THE WATSONVILLE AREA WHERE WE DID AIRWORK FOR ABOUT 45 MINS. WE THEN DECIDED TO DO SOME 'TOUCH AND GOES' AT HOLLISTER. WE ARRIVED AT THE HOLLISTER ARPT AT APPROX XB40. WE ANNOUNCED OUR INTENTIONS ON THE CTAF AND ENTERED A L DOWNWIND FOR RWY 31. ON THE DOWNWIND I NOTICED THAT THE WIND WAS FAVORING RWY 24 AND ANNOUNCED ON THE CTAF THAT WE WERE CHANGING OUR 'TOUCH AND GO' MANEUVER TO RWY 24. I ESTIMATED THE WIND TO BE FROM 260 DEGS; GUSTING. I TOOK CTL OF THE ACFT AND PROCEEDED WITH THE LNDG. ON TURNING FINAL I HAD THE ACFT IN FULL LNDG CONFIGN WITH WHEELS DOWN AND FULL FLAPS. I WENT THROUGH THE LNDG CHKLIST AND HAD EVERYTHING IN ORDER. AS I FLARED THE ACFT FOR LNDG I LOST SIGHT OF THE RWY. THE WIND APPARENTLY WAS BLOWING STRONGER FROM R TO L THEN I HAD ANTICIPATED AND BLEW US TO THE EXTREME L SIDE OF THE RWY. AT TOUCHDOWN THE ACFT BOUNCED SLIGHTLY AND PROCEEDED OFF THE L SIDE OF THE RWY CONTACTING A RWY MARKER. THE MARKER COLLAPSED THE L MAIN LNDG GEAR; THE L WINGTIP DUG IN AND THE ACFT DID A 180 DEG AND CAME TO REST ON A HEADING OF APPROX 060 DEGS. THERE WERE NO APPARENT INJURIES TO MR X OR I. THE VISIBLE DAMAGE TO THE ACFT INCLUDED THE COLLAPSED L MAIN GEAR AND THE L FLAP. THE NOSEWHEEL DID NOT COLLAPSE; SO THERE WAS NO DAMAGE TO THE PROP OR ENG. THERE WERE SEVERAL THINGS I COULD HAVE DONE TO PREVENT THE INCIDENT. I BELIEVE I SHOULD HAVE USED LESS FLAP; AND I SHOULD HAVE APPLIED CRM BY HAVING MR X ASSIST ME IN KEEPING THE ACFT OVER THE CTRLINE. I TOLD HIM BEFORE WE LEFT MONTEREY THAT WHEN LNDG YOU LOSE SIGHT OF THE RWY FROM THE REAR SEAT; BUT I DID NOT ASK FOR HIS HELP WHEN MAKING THE ACTUAL LNDG.