Narrative:

This was the second time that something like this happened while I was in the pattern in fdk with my student. Last time, we were in the pattern for runway 30, when they called on the radio from the flight school and told me to contact potomac, because of violation of the ADIZ. I called and let them know that we stayed in the pattern. They had other tail numbers, too, and they called the other pilots. Again, we were in the pattern for runway 30, and never left the pattern. I called potomac, and they said that we violated ADIZ 5 NM south of fdk. We remained in the pattern within 2-3 NM for fdk, and we had GPS to record/show our position from the airport (fdk). I have flown from the airport for 1 yr, and I know where the boundaries of the ADIZ are by using both GPS and visual reference. Potomac had the only primary targets, and our transponder was on.

Google
 

Original NASA ASRS Text

Title: A C172 CFI CANNOT UNDERSTAND WHY SHE HAS BEEN VIOLATED TWICE FOR ENTERING THE DC ADIZ, WHILE REMAINING IN THE FDK PATTERN.

Narrative: THIS WAS THE SECOND TIME THAT SOMETHING LIKE THIS HAPPENED WHILE I WAS IN THE PATTERN IN FDK WITH MY STUDENT. LAST TIME, WE WERE IN THE PATTERN FOR RWY 30, WHEN THEY CALLED ON THE RADIO FROM THE FLT SCHOOL AND TOLD ME TO CONTACT POTOMAC, BECAUSE OF VIOLATION OF THE ADIZ. I CALLED AND LET THEM KNOW THAT WE STAYED IN THE PATTERN. THEY HAD OTHER TAIL NUMBERS, TOO, AND THEY CALLED THE OTHER PLTS. AGAIN, WE WERE IN THE PATTERN FOR RWY 30, AND NEVER LEFT THE PATTERN. I CALLED POTOMAC, AND THEY SAID THAT WE VIOLATED ADIZ 5 NM S OF FDK. WE REMAINED IN THE PATTERN WITHIN 2-3 NM FOR FDK, AND WE HAD GPS TO RECORD/SHOW OUR POS FROM THE ARPT (FDK). I HAVE FLOWN FROM THE ARPT FOR 1 YR, AND I KNOW WHERE THE BOUNDARIES OF THE ADIZ ARE BY USING BOTH GPS AND VISUAL REFERENCE. POTOMAC HAD THE ONLY PRIMARY TARGETS, AND OUR XPONDER WAS ON.

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.