Although advised by pct to remain on their discrete code, flight crew of C550 operating to gai within the dc ADIZ improperly selected 1200 on transponder when canceling IFR.

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Attributes
ACN	588854
Time
Date	200307
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : gai.airport
State Reference	MD
Altitude	agl single value : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pct.tracon
Operator	general aviation : corporate
Make Model Name	Citation II S2/Bravo
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : traffic pattern approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : multi engine
Experience	flight time last 90 days : 138 flight time total : 10000 flight time type : 1100
ASRS Report	588854
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 140 flight time total : 3300 flight time type : 510
ASRS Report	588853
Events
Anomaly	aircraft equipment problem : critical airspace violation : entry non adherence : clearance non adherence : published procedure non adherence : far
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Airspace Structure Environmental Factor FAA Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
Airspace Structure	special use : dcadiz.othersua

Narrative:

While on an IFR flight to gai, potomac approach cleared us direct to montgomery county airport and advised us to expect a visual approach. Approximately 4 NM northeast of the airport, the captain, who was the PF, acquired the field and requested the first officer to notify ATC. The first officer complied and potomac approach cleared us for a visual approach. Upon entering a left downwind for runway 14, the captain requested the first officer cancel IFR. ATC acknowledged cancellation and advised us to maintain assigned transponder code -- gai is located in the washington, dc ADIZ. The first officer, out of habit, automatically selected 1200. The first officer brought this to the captain's attention. The captain, preoccupied with a visual approach to an uncontrolled airport with other slower traffic in the pattern, did not process the first officer's input. Upon landing, the captain received a call from potomac approach.

Original NASA ASRS Text

Title: ALTHOUGH ADVISED BY PCT TO REMAIN ON THEIR DISCRETE CODE, FLT CREW OF C550 OPERATING TO GAI WITHIN THE DC ADIZ IMPROPERLY SELECTED 1200 ON XPONDER WHEN CANCELING IFR.

Narrative: WHILE ON AN IFR FLT TO GAI, POTOMAC APCH CLRED US DIRECT TO MONTGOMERY COUNTY ARPT AND ADVISED US TO EXPECT A VISUAL APCH. APPROX 4 NM NE OF THE ARPT, THE CAPT, WHO WAS THE PF, ACQUIRED THE FIELD AND REQUESTED THE FO TO NOTIFY ATC. THE FO COMPLIED AND POTOMAC APCH CLRED US FOR A VISUAL APCH. UPON ENTERING A L DOWNWIND FOR RWY 14, THE CAPT REQUESTED THE FO CANCEL IFR. ATC ACKNOWLEDGED CANCELLATION AND ADVISED US TO MAINTAIN ASSIGNED XPONDER CODE -- GAI IS LOCATED IN THE WASHINGTON, DC ADIZ. THE FO, OUT OF HABIT, AUTOMATICALLY SELECTED 1200. THE FO BROUGHT THIS TO THE CAPT'S ATTN. THE CAPT, PREOCCUPIED WITH A VISUAL APCH TO AN UNCTLED ARPT WITH OTHER SLOWER TFC IN THE PATTERN, DID NOT PROCESS THE FO'S INPUT. UPON LNDG, THE CAPT RECEIVED A CALL FROM POTOMAC APCH.

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.