An air carrier flight crew accepts a clearance meant for another aircraft when the PIC, PNF, misunderstands the approach controller's call sign enunciation at atl, GA.

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Attributes
ACN	472291
Time
Date	200005
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : atl.vortac
State Reference	GA
Altitude	msl bound lower : 5000 msl bound upper : 6000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : atl.tracon tower : ord.tower
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 190 flight time total : 7500 flight time type : 130
ASRS Report	472291
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued advisory controller : issued new clearance flight crew : returned to intended or assigned course
Consequence	Other
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance Airspace Structure Environmental Factor
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were level at 6000 ft heading wbound for an ILS to runway 8L at atl, GA. Our call sign was wwyw. We were being vectored by atl approach control. We received a clearance to turn left to a heading of 180 degrees and descend to 5000 ft. The captain acknowledged the clearance on the radio and I made the turn and started to descend. The controller was not annunciating his words very well and apparently we took another aircraft's clearance (air carrier xyw). We were told to stop our descent and turn back to the right heading 320 degrees. We never did get a TA or an RA on the TCASII, so a traffic conflict was not a factor. We were then told to descend to 5000 ft and a heading of 270 degrees. Landed normally.

Original NASA ASRS Text

Title: AN ACR FLC ACCEPTS A CLRNC MEANT FOR ANOTHER ACFT WHEN THE PIC, PNF, MISUNDERSTANDS THE APCH CTLR'S CALL SIGN ENUNCIATION AT ATL, GA.

Narrative: WE WERE LEVEL AT 6000 FT HDG WBOUND FOR AN ILS TO RWY 8L AT ATL, GA. OUR CALL SIGN WAS WWYW. WE WERE BEING VECTORED BY ATL APCH CTL. WE RECEIVED A CLRNC TO TURN L TO A HDG OF 180 DEGS AND DSND TO 5000 FT. THE CAPT ACKNOWLEDGED THE CLRNC ON THE RADIO AND I MADE THE TURN AND STARTED TO DSND. THE CTLR WAS NOT ANNUNCIATING HIS WORDS VERY WELL AND APPARENTLY WE TOOK ANOTHER ACFT'S CLRNC (ACR XYW). WE WERE TOLD TO STOP OUR DSCNT AND TURN BACK TO THE R HDG 320 DEGS. WE NEVER DID GET A TA OR AN RA ON THE TCASII, SO A TFC CONFLICT WAS NOT A FACTOR. WE WERE THEN TOLD TO DSND TO 5000 FT AND A HDG OF 270 DEGS. LANDED NORMALLY.

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.