Narrative:

While approaching the washington, dc, ADIZ from the southwest, I called potomac approach for a squawk code for entry. I was given a squawk code which was heard by myself and a passenger. Potomac approach was very busy and the controller was working more than 1 frequency. I was not radar idented by the controller upon penetration of the ADIZ, but didn't need to be in terms of the NOTAM since I had a discrete beacon code and was in 2-WAY radio communications with ATC. After 4 calls to approach inside the ADIZ with no answer, I suspected radio failure but the controller answered my last call. He asked my position. I responded 'about to enter class D' at manassas. He asked if I was squawking my assigned code. I responded that I was given/squawking, as assigned. The controller responded 'squawk the proper code.' I dialed in the code, at which point I was nearly inside the manassas class D. I asked the approach controller for a frequency change to the tower and again got no response. At this point (approximately 4 mi from manassas airport), I noticed a long ez less than 1/2 mi on a collision course. I took evasive action and we missed by about 300 ft laterally and 0 ft vertically. Since the approach controller was not answering my latest calls, I switched to tower on my own and landing without clearance. This situation could have been avoided if potomac had assigned a dedicated controller to work the 120.82 frequency, which is solely for ADIZ arrs/departures at manassas. This is the first time since the establishment of the 120.82 frequency that I have heard a controller working other frequencys as well as 120.82 on a VFR saturday (which is peak time for manassas). Also, I will confirm that I am radar idented in the future before ADIZ penetration, even though the law doesn't require it.

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Original NASA ASRS Text

Title: A C177 SINGLE PLT ENTERED THE DC ADIZ.

Narrative: WHILE APCHING THE WASHINGTON, DC, ADIZ FROM THE SW, I CALLED POTOMAC APCH FOR A SQUAWK CODE FOR ENTRY. I WAS GIVEN A SQUAWK CODE WHICH WAS HEARD BY MYSELF AND A PAX. POTOMAC APCH WAS VERY BUSY AND THE CTLR WAS WORKING MORE THAN 1 FREQ. I WAS NOT RADAR IDENTED BY THE CTLR UPON PENETRATION OF THE ADIZ, BUT DIDN'T NEED TO BE IN TERMS OF THE NOTAM SINCE I HAD A DISCRETE BEACON CODE AND WAS IN 2-WAY RADIO COMS WITH ATC. AFTER 4 CALLS TO APCH INSIDE THE ADIZ WITH NO ANSWER, I SUSPECTED RADIO FAILURE BUT THE CTLR ANSWERED MY LAST CALL. HE ASKED MY POS. I RESPONDED 'ABOUT TO ENTER CLASS D' AT MANASSAS. HE ASKED IF I WAS SQUAWKING MY ASSIGNED CODE. I RESPONDED THAT I WAS GIVEN/SQUAWKING, AS ASSIGNED. THE CTLR RESPONDED 'SQUAWK THE PROPER CODE.' I DIALED IN THE CODE, AT WHICH POINT I WAS NEARLY INSIDE THE MANASSAS CLASS D. I ASKED THE APCH CTLR FOR A FREQ CHANGE TO THE TWR AND AGAIN GOT NO RESPONSE. AT THIS POINT (APPROX 4 MI FROM MANASSAS ARPT), I NOTICED A LONG EZ LESS THAN 1/2 MI ON A COLLISION COURSE. I TOOK EVASIVE ACTION AND WE MISSED BY ABOUT 300 FT LATERALLY AND 0 FT VERTLY. SINCE THE APCH CTLR WAS NOT ANSWERING MY LATEST CALLS, I SWITCHED TO TWR ON MY OWN AND LWOC. THIS SIT COULD HAVE BEEN AVOIDED IF POTOMAC HAD ASSIGNED A DEDICATED CTLR TO WORK THE 120.82 FREQ, WHICH IS SOLELY FOR ADIZ ARRS/DEPS AT MANASSAS. THIS IS THE FIRST TIME SINCE THE ESTABLISHMENT OF THE 120.82 FREQ THAT I HAVE HEARD A CTLR WORKING OTHER FREQS AS WELL AS 120.82 ON A VFR SATURDAY (WHICH IS PEAK TIME FOR MANASSAS). ALSO, I WILL CONFIRM THAT I AM RADAR IDENTED IN THE FUTURE BEFORE ADIZ PENETRATION, EVEN THOUGH THE LAW DOESN'T REQUIRE IT.

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.