BE35 pilot inadvertently reenters dc ADIZ after exiting and switching to VFR transponder code.

Attributes
ACN	717672
Time
Date	200611
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : gai.airport
State Reference	MD
Altitude	agl single value : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pct.tracon
Operator	general aviation : personal
Make Model Name	Bonanza 35
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	DVR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : private
Experience	flight time last 90 days : 35 flight time total : 3200 flight time type : 600
ASRS Report	717672
Person 2
Affiliation	government : faa
Function	controller : approach
Events
Anomaly	aircraft equipment problem : less severe airspace violation : entry non adherence : published procedure other spatial deviation
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Departed montgomery county airport near washington dc on a DVFR flight plan; after exiting ADIZ and changing to VFR transponder code of 1200; I turned eastward and inadvertently had an incursion into the washington ADIZ. Apparently ATC released me directly on the ADIZ line. I thought I would not be switched till the westminster VOR as filed. In the future I will keep better reference to my actual position when in the vicinity of controled airspace.

Original NASA ASRS Text

Title: BE35 PLT INADVERTENTLY REENTERS DC ADIZ AFTER EXITING AND SWITCHING TO VFR XPONDER CODE.

Narrative: DEPARTED MONTGOMERY COUNTY ARPT NEAR WASHINGTON DC ON A DVFR FLT PLAN; AFTER EXITING ADIZ AND CHANGING TO VFR XPONDER CODE OF 1200; I TURNED EASTWARD AND INADVERTENTLY HAD AN INCURSION INTO THE WASHINGTON ADIZ. APPARENTLY ATC RELEASED ME DIRECTLY ON THE ADIZ LINE. I THOUGHT I WOULD NOT BE SWITCHED TILL THE WESTMINSTER VOR AS FILED. IN THE FUTURE I WILL KEEP BETTER REF TO MY ACTUAL POS WHEN IN THE VICINITY OF CTLED AIRSPACE.

Data retrieved from NASA's ASRS site as of January 2009 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.