INSTRUCTOR PLT OF AN SMA SEL ACFT FAILED TO STOP AT THE RWY HOLD LINE RESULTING IN THE TWR CTLR INTERVENTION.

Narrative

ENCLOSED IS A DIAGRAM OF THE ARPT. I MARKED IN RED WHERE THE HOLD LINE IS. I HAD FLOWN WITH A STUDENT TO DANBURY TO LOOK AT AIRPLANES FOR SALE. WHEN WE LEFT ISP THE WINDS WERE 8 KTS. BY THE TIME WE ARRIVED AT DXR THEY WERE 14 KTS. WHEN WE LEFT THEY WERE GUSTING. AS WE WERE TAXIING TO RWY 26 MY STUDENT WAS HAVING DIFFICULTY AND I WAS CONSTANTLY CORRECTING HIM TO MAINTAIN CTRLINE. WE STOPPED AT THE INTXN OF THE 2 RWYS. THE GND CTLR ASKED IF WE WANTED AN INTXN TKOF. I REPLIED 'NO' AND SHE CLRED US TO THE FULL LENGTH. I MUST GUESS THAT AS WE CAME UPON THE HOLD LINE MY ATTN WAS ON MY STUDENT. I DIDN'T EXPECT A HOLD LINE THAT FAR FROM THE TKOF END OF THE RWY. NO ARPT I'VE EVER BEEN IN HAS HAD A HOLD LINE THAT FAR DOWN A RWY WITH NO ENTRANCE TO THE RWY AT THAT POINT. I ASSUMED THE HOLD LINE WAS ON THE ENTRANCE TO THE RWY AND I COULDN'T SEE IT FROM THAT FAR AWAY SO I WASN'T LOOKING FOR THE HOLD LINE AT THAT POINT. WHEN THE CTLR TOLD US TO STOP I DID. THEY DIDN'T COME BACK TO ME UNTIL I FINALLY ASKED IF THERE WAS A PROB. THEN I WAS INFORMED OF THE HOLD LINE; ASKED IF READY FOR TKOF AND; WITH AN AFFIRMATIVE REPLY; TOLD TO CONTACT THE TWR CTLR. WE WERE THEN CLRED TO TKOF. UPON GETTING BACK TO ISP; I LOOKED AGAIN IN THE AFD TO SEE IF THERE WAS A NOTE ABOUT THE UNUSUAL PLACE OF THE HOLD LINE. (I HAD READ ABOUT DXR IN THE AFD PRIOR TO LEAVING HOME BASE.) I THEN CHKED THE TANN GUIDE AND AIRWAY MANUAL. NONE HAD A NOTE OR ANY MENTION OF WHERE THE HOLD LINE IS. WHILE I REALIZE I WAS REMISS IN NOT SEEING IT; I KNOW THAT HAD I KNOWN IT WAS THAT FAR FROM THE ENTRANCE TO THE FULL LENGTH END OF THE ACTIVE RWY; I WOULD HAVE NOT GONE THROUGH IT. IT MADE ME WONDER IF THIS MIGHT NOT BE A POSSIBLE ONGOING PROB TO PEOPLE USING RWY 26 AT DANBURY FOR THE FIRST TIME. IT WOULD BE EASY TO REMEDY BY EITHER HAVING A NOTE IN THE AFD OR AIRWAY MANUAL OR HAVING THE GND CTLR MENTION IT.