Flight crew of DC9 uses wrong transponder code on departure. Controller requests an identify and is then really confused. The wrong code is discovered and corrected.

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Attributes
ACN	396670
Time
Date	199803
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : dtw
State Reference	MI
Altitude	msl bound lower : 15000 msl bound upper : 15000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dtw
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 210 flight time total : 5500 flight time type : 420
ASRS Report	396670
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	other anomaly other
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Our transponder code in our clearance was XXXX. On cockpit setup I accidentally set in xxyy. On climb out, ATC asked us to identify and told us to squawk XXXX -- xxyy was assigned to another air carrier and this confused the controller. To my knowledge, no conflict occurred. Corrective action would be to pay closer attention to the assigned code and checklist.

Original NASA ASRS Text

Title: FLC OF DC9 USES WRONG XPONDER CODE ON DEP. CTLR REQUESTS AN IDENT AND IS THEN REALLY CONFUSED. THE WRONG CODE IS DISCOVERED AND CORRECTED.

Narrative: OUR XPONDER CODE IN OUR CLRNC WAS XXXX. ON COCKPIT SETUP I ACCIDENTALLY SET IN XXYY. ON CLBOUT, ATC ASKED US TO IDENT AND TOLD US TO SQUAWK XXXX -- XXYY WAS ASSIGNED TO ANOTHER ACR AND THIS CONFUSED THE CTLR. TO MY KNOWLEDGE, NO CONFLICT OCCURRED. CORRECTIVE ACTION WOULD BE TO PAY CLOSER ATTN TO THE ASSIGNED CODE AND CHKLIST.

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.