Time lapse between taking frequency change for another aircraft and re-establishing proper frequency causes A320 flight crew to have conflict with same altitude traffic.

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Attributes
ACN	423502
Time
Date	199812
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : msp
State Reference	MN
Altitude	msl bound lower : 5000 msl bound upper : 17000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	A320
Navigation In Use	Other
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 11000 flight time type : 1000
ASRS Report	423502
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	conflict : ground less severe non adherence : clearance non adherence other other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 30000 vertical : 0
Supplementary
Air Traffic Incident	other

Narrative:

After being cleared from 5000 ft to 17000 ft by msp departure control while on a heading of 240 degrees, we apparently took another aircraft's frequency change and contacted ZMP. That controller, rather than send us back to departure control, sent us to a different center controller who resolved the handoff ambiguity. While this was being done, we saw on TCASII that we came close to 5 mi with a co-altitude aircraft. No TCASII RA was issued. Outside vigilance as well as radio discipline were re-emphasized as a result.

Original NASA ASRS Text

Title: TIME LAPSE BTWN TAKING FREQ CHANGE FOR ANOTHER ACFT AND RE-ESTABLISHING PROPER FREQ CAUSES A320 FLC TO HAVE CONFLICT WITH SAME ALT TFC.

Narrative: AFTER BEING CLRED FROM 5000 FT TO 17000 FT BY MSP DEP CTL WHILE ON A HDG OF 240 DEGS, WE APPARENTLY TOOK ANOTHER ACFT'S FREQ CHANGE AND CONTACTED ZMP. THAT CTLR, RATHER THAN SEND US BACK TO DEP CTL, SENT US TO A DIFFERENT CTR CTLR WHO RESOLVED THE HDOF AMBIGUITY. WHILE THIS WAS BEING DONE, WE SAW ON TCASII THAT WE CAME CLOSE TO 5 MI WITH A CO-ALT ACFT. NO TCASII RA WAS ISSUED. OUTSIDE VIGILANCE AS WELL AS RADIO DISCIPLINE WERE RE-EMPHASIZED AS A RESULT.

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.