A C-172 pilot was notified by pct that he entered the dc ADIZ without permission.

Attributes
ACN	585817
Time
Date	200306
Day	Sun
Place
Locale Reference	intersection : armel
State Reference	VA
Altitude	msl single value : 3500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pct.tracon
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	VFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : cfi pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 120 flight time total : 1200 flight time type : 90
ASRS Report	585817
Person 2
Affiliation	government : faa
Function	controller : approach
Events
Anomaly	airspace violation : entry non adherence : published procedure non adherence : far
Independent Detector	other controllera
Resolutory Action	controller : issued advisory
Consequence	faa : reviewed incident with flight crew faa : investigated
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was transiting sbound between khgr and the csn VOR. I had filed an ADIZ flight plan for my destination of quantico, va. I was unable to capture the attention of ZDC until I encountered the class B 4500 ft shelf (20 NM from armel). I contacted potomac approach for ADIZ clearance and VFR direct to nyg, but was notified that I was already within the western boundary of the ZDC ADIZ. I received a transponder code and clearance to continue to my destination. I was underneath the class B airspace at the time. Cause was inadequate preflight planning in determination of ADIZ boundaries. I had presumed that the 30 NM mode C veil around dca VOR was adequate, but I was mistaken.

Original NASA ASRS Text

Title: A C-172 PLT WAS NOTIFIED BY PCT THAT HE ENTERED THE DC ADIZ WITHOUT PERMISSION.

Narrative: I WAS TRANSITING SBOUND BTWN KHGR AND THE CSN VOR. I HAD FILED AN ADIZ FLT PLAN FOR MY DEST OF QUANTICO, VA. I WAS UNABLE TO CAPTURE THE ATTN OF ZDC UNTIL I ENCOUNTERED THE CLASS B 4500 FT SHELF (20 NM FROM ARMEL). I CONTACTED POTOMAC APCH FOR ADIZ CLRNC AND VFR DIRECT TO NYG, BUT WAS NOTIFIED THAT I WAS ALREADY WITHIN THE WESTERN BOUNDARY OF THE ZDC ADIZ. I RECEIVED A XPONDER CODE AND CLRNC TO CONTINUE TO MY DEST. I WAS UNDERNEATH THE CLASS B AIRSPACE AT THE TIME. CAUSE WAS INADEQUATE PREFLT PLANNING IN DETERMINATION OF ADIZ BOUNDARIES. I HAD PRESUMED THAT THE 30 NM MODE C VEIL AROUND DCA VOR WAS ADEQUATE, BUT I WAS MISTAKEN.

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.