Narrative:

This was a training flight to practice NDB procedures. My 5TH approach of the day was the NDB 9 circle to land runway 27, with clearance for a touch and go. Upon climbing out from the touch and go, tower informed me that I had landed prior to the displaced threshold. My safety pilot said I had not only landed prior to the threshold, but had taken off prior to it as well. I hadn't even noticed that there was one. Upon looking it up in the airport facility directory after landing, I discovered runway 27 had a 2000 ft displaced threshold.

Google
 

Original NASA ASRS Text

Title: PA28 CFI PERFORMS AN UNAUTH LNDG PRIOR TO THE DISPLACED THRESHOLD ON RWY 27 AT SWF, NY. HIS SAFETY PLT OBSERVER FAILS TO ADVISE HIM OF THE IMPENDING ERROR. TWR CTLR ADVISES PLT AFTER THE EVENT.

Narrative: THIS WAS A TRAINING FLT TO PRACTICE NDB PROCS. MY 5TH APCH OF THE DAY WAS THE NDB 9 CIRCLE TO LAND RWY 27, WITH CLRNC FOR A TOUCH AND GO. UPON CLBING OUT FROM THE TOUCH AND GO, TWR INFORMED ME THAT I HAD LANDED PRIOR TO THE DISPLACED THRESHOLD. MY SAFETY PLT SAID I HAD NOT ONLY LANDED PRIOR TO THE THRESHOLD, BUT HAD TAKEN OFF PRIOR TO IT AS WELL. I HADN'T EVEN NOTICED THAT THERE WAS ONE. UPON LOOKING IT UP IN THE ARPT FACILITY DIRECTORY AFTER LNDG, I DISCOVERED RWY 27 HAD A 2000 FT DISPLACED THRESHOLD.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.