Narrative:

At approximately XA00 am, I filed a VFR ADIZ flight plan with lessburg flight service from hef to csn VORTAC, departing hef at XA30 am and returning to hef 1 hour later. I contacted hef tower and received a transponder code and a potomac approach frequency. I set the frequency in my radio, set the transponder code and turned the transponder switch to standby. The WX was VFR and there was a lot of incoming/outgoing traffic on runway 16L. After waiting for sometime, I was cleared to the southwest with an altitude of 2500 ft. In due course, I was cleared by the manassas tower, told to contact potomac approach. I waited expecting a call to clear me from the ADIZ. After a reasonable time, when I didn't hear from potomac approach, I conducted an instrument and radio troubleshoot exercise. To my surprise, I had not turned my transponder from standby to altitude, but did so immediately. I flew to csn using visual references and a moving map display and called potomac approach. The frequency was very busy due to traffic and so I flew at 2500 ft to W66, and again called potomac approach. They responded and asked if I had filed departure and return flight plans. I responded affirmatively. I then requested clearance to return to hef and received a new transponder code which I entered and was requested to report 'airport in sight.' then potomac approach requested I call upon landing. I reported 'airport in sight,' and called manassas tower and landed on runway 16L. Upon landing I contacted the requested number and was told I might have violated the ADIZ and could receive a call from the FAA. To date there has been no contact.

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Original NASA ASRS Text

Title: ENRTE THROUGH THE DC ADIZ, C182 PLT REALIZES THAT HE HAS FAILED TO TURN HIS XPONDER FROM STANDBY TO ALT.

Narrative: AT APPROX XA00 AM, I FILED A VFR ADIZ FLT PLAN WITH LESSBURG FLT SVC FROM HEF TO CSN VORTAC, DEPARTING HEF AT XA30 AM AND RETURNING TO HEF 1 HR LATER. I CONTACTED HEF TWR AND RECEIVED A XPONDER CODE AND A POTOMAC APCH FREQ. I SET THE FREQ IN MY RADIO, SET THE XPONDER CODE AND TURNED THE XPONDER SWITCH TO STANDBY. THE WX WAS VFR AND THERE WAS A LOT OF INCOMING/OUTGOING TFC ON RWY 16L. AFTER WAITING FOR SOMETIME, I WAS CLRED TO THE SW WITH AN ALT OF 2500 FT. IN DUE COURSE, I WAS CLRED BY THE MANASSAS TWR, TOLD TO CONTACT POTOMAC APCH. I WAITED EXPECTING A CALL TO CLR ME FROM THE ADIZ. AFTER A REASONABLE TIME, WHEN I DIDN'T HEAR FROM POTOMAC APCH, I CONDUCTED AN INST AND RADIO TROUBLESHOOT EXERCISE. TO MY SURPRISE, I HAD NOT TURNED MY XPONDER FROM STANDBY TO ALT, BUT DID SO IMMEDIATELY. I FLEW TO CSN USING VISUAL REFS AND A MOVING MAP DISPLAY AND CALLED POTOMAC APCH. THE FREQ WAS VERY BUSY DUE TO TFC AND SO I FLEW AT 2500 FT TO W66, AND AGAIN CALLED POTOMAC APCH. THEY RESPONDED AND ASKED IF I HAD FILED DEP AND RETURN FLT PLANS. I RESPONDED AFFIRMATIVELY. I THEN REQUESTED CLRNC TO RETURN TO HEF AND RECEIVED A NEW XPONDER CODE WHICH I ENTERED AND WAS REQUESTED TO RPT 'ARPT IN SIGHT.' THEN POTOMAC APCH REQUESTED I CALL UPON LNDG. I RPTED 'ARPT IN SIGHT,' AND CALLED MANASSAS TWR AND LANDED ON RWY 16L. UPON LNDG I CONTACTED THE REQUESTED NUMBER AND WAS TOLD I MIGHT HAVE VIOLATED THE ADIZ AND COULD RECEIVE A CALL FROM THE FAA. TO DATE THERE HAS BEEN NO CONTACT.

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.