On an IFR flight plan to mtn within the dc ADIZ and cleared for a visual approach to his destination, the pilot of a C130 improperly changed his transponder code to 1200.

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Attributes
ACN	625010
Time
Date	200407
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mtn.airport
State Reference	MD
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : pct.tracon
Operator	other
Make Model Name	Hercules (C-130)
Operating Under FAR Part	Part 91
Flight Phase	descent : approach descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : military
Function	observation : observer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 100 flight time total : 5000 flight time type : 1000
ASRS Report	625010
Person 2
Affiliation	government : military
Function	flight crew : captain oversight : pic
Events
Anomaly	airspace violation : entry non adherence : far non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

While on an IFR arrival to mtn, we were cleared for a visual approach and switched to CTAF. After landing, ATC informed us we squawked 1200 while in the ADIZ. I was an extra pilot on the flight, not at the controls, but do not recall the crew switching to 1200. If they did, it was a mistake done unintentionally by the crew. If this happens in the future, I would think ATC would inform the crew of this mistake and the correct code could be re-entered. This is similar to what would be done if the transponder stopped working.

Original NASA ASRS Text

Title: ON AN IFR FLT PLAN TO MTN WITHIN THE DC ADIZ AND CLRED FOR A VISUAL APCH TO HIS DEST, THE PLT OF A C130 IMPROPERLY CHANGED HIS XPONDER CODE TO 1200.

Narrative: WHILE ON AN IFR ARR TO MTN, WE WERE CLRED FOR A VISUAL APCH AND SWITCHED TO CTAF. AFTER LNDG, ATC INFORMED US WE SQUAWKED 1200 WHILE IN THE ADIZ. I WAS AN EXTRA PLT ON THE FLT, NOT AT THE CTLS, BUT DO NOT RECALL THE CREW SWITCHING TO 1200. IF THEY DID, IT WAS A MISTAKE DONE UNINTENTIONALLY BY THE CREW. IF THIS HAPPENS IN THE FUTURE, I WOULD THINK ATC WOULD INFORM THE CREW OF THIS MISTAKE AND THE CORRECT CODE COULD BE RE-ENTERED. THIS IS SIMILAR TO WHAT WOULD BE DONE IF THE XPONDER STOPPED WORKING.

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.