C182 pilot switches transponder code while in dc ADIZ against published procedures.

Attributes
ACN	703033
Time
Date	200607
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zdc.artcc
State Reference	VA
Altitude	msl single value : 1000
Environment
Flight Conditions	Marginal
Weather Elements	other
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc
Operator	general aviation : personal
Make Model Name	Skylane 182/RG Turbo Skylane/RG
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot oversight : pic
Qualification	pilot : instrument
Experience	flight time total : 530
ASRS Report	703033
Person 2
Affiliation	government : faa
Function	controller : radar
Experience	controller military : 4 controller radar : 20
Events
Anomaly	non adherence : published procedure non adherence : far
Independent Detector	other controllerb
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure
Primary Problem	Flight Crew Human Performance

Narrative:

Pilot deviation; unintentional. I switched my transponder to 'VFR' from my 'IFR' code after canceling my IFR flight plan with mtn tower; which is inside the dc ADIZ.

Original NASA ASRS Text

Title: C182 PLT SWITCHES XPONDER CODE WHILE IN DC ADIZ AGAINST PUBLISHED PROCS.

Narrative: PLTDEV; UNINTENTIONAL. I SWITCHED MY XPONDER TO 'VFR' FROM MY 'IFR' CODE AFTER CANCELING MY IFR FLT PLAN WITH MTN TWR; WHICH IS INSIDE THE DC ADIZ.

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.