RWY EXCURSION. INSTRUCTOR ALLOWS A STUDENT PLT TO LAND LONG AND FAST AND THE ACFT RUNS OFF THE END OF THE RWY.

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AFTER AN EARLY MORNING (XA00) FLT; A LONG DAY OF SITTING AROUND AN UNFAMILIAR ARPT; AND A RETURN TRIP HOME; I FOUND MY NEXT STUDENT WAITING FOR ME AND READY TO GO. HE HAD BROUGHT HIS 2 CHILDREN AND WANTED TO PRACTICE LNDGS AND VISIT THE KIDS' MOTHER AT THE ARPT CLOSEST TO HER HOME. MY STUDENT PRE-FLTED THE PLANE WHILE I LOOKED ON MY CHARTS FOR THE ARPT THAT MY STUDENT HAD ALREADY TOLD HIS WIFE TO MEET US. WE ONLY HAD THE PLANE FOR A SHORT TIME AND WE WERE RUSHED TO LEAVE. THE FLT PROCEEDED NORMALLY. WITH MY STUDENT FLYING; I CALCULATED THE TKOF AND LNDG DISTANCES FOR THE AIRPLANE AND CHKED THE LENGTH OF THE ARPT -- WITHIN LIMITS; NO PROB. WE FOUND THE ARPT AND ENTERED THE PATTERN TO THE RWY IN USE. THE FINAL APCH WAS FACING DIRECTLY INTO THE SUN; MAKING IT DIFFICULT TO SEE AND TO JUDGE DISTANCES. WITH THE STUDENT FLYING; THE FIRST APCH WAS FAST AND HIGH. I MADE HIM GAR. THE SECOND APCH WAS BETTER; BUT HE WAS STILL SLIGHTLY FAST. I LET HIM PROCEED; HE TOUCHED DOWN FAST AND LONG; AND DID NOT APPLY BRAKES IMMEDIATELY. I TOOK CTL OF THE PLANE AND DECIDED AGAINST A GAR DUE TO OBSTACLES AT THE DEP END OF THE RWY. WITH MAX BRAKING APPLIED; INSUFFICIENT RWY REMAINED TO STOP. THE PLANE SKIDDED OFF THE END OF THE RWY AND INTO A DITCH AT THE END. TO PREVENT THIS FROM HAPPENING TO SOMEONE ELSE; I WOULD SUGGEST THAT NO MATTER HOW RUSHED YOU ARE TO GET TO YOUR DEST; BE SURE TO TAKE THE TIME TO DISCUSS THE SPECIFICS ABOUT THE ARPT. I KNEW FROM THE NUMBERS THAT THE RWY WAS SHORT; BUT WITHOUT A BRIEFING BEFORE THE PLANE EVER LEFT THE GND THERE WAS NO WAY FOR MY STUDENT TO REALIZE THAT THIS ARPT WAS WAY DIFFERENT FROM WHAT HE WAS USED TO AND THAT THERE WAS NO ROOM FOR ERROR. NO MATTER HOW RUSHED YOU ARE; TAKE THE TIME TO DISCUSS THE FLT BEFORE YOU LEAVE THE GND. GO THROUGH EACH MANEUVER AND TALK ABOUT PROCS SO YOU DON'T HAVE TO BE THINKING ABOUT THEM ON FINAL APCH AND SO BOTH PEOPLE IN THE FRONT SEAT KNOW EXACTLY WHAT YOU ARE TRYING TO ACCOMPLISH. AS IT TURNS OUT; THIS ARPT HAS ONE OF THE SHORTEST RWYS IN THE STATE. IT HAS A HISTORY OF RWY OVERRUNS; AND HAD WE DONE A LITTLE TALKING BEFORE THE FLT; THE WHOLE THING COULD HAVE BEEN PREVENTED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE INSTRUCTOR WAS FLYING A PIPER WARRIOR AND HE WAS ALLOWING HIS STUDENT TO ATTEMPT A LNDG AT MARLBORO ARPT IN MATAWAN; NJ. THE ACFT RECEIVED MINOR DAMAGE AND AFTER A MECH DID REPAIRS THE SAME INSTRUCTOR FLEW THE ACFT TO ITS HOME BASE. THERE WERE NO INJURIES. THE FAA REQUIRED THE INSTRUCTOR TO TAKE A WRITTEN EXAMINATION AND A FLT CHK.