A80 controller described incident at 3000 ft as aircraft sidestepping from runway 9L to runway 9R overshot the turn and conflicted with traffic on visual approach to runway 10.

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Attributes
ACN	713951
Time
Date	200610
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl.airport
State Reference	GA
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : a80.tracon
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : a80.tracon
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 20
ASRS Report	713951
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne critical non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Miss Distance	horizontal : 500 vertical : 100
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was working final a position; running mixed ILS runway 10 and visual approach to runway 10. My partner was working final 'O' position running ILS runway 9L sidestep to runway 9R. Air carrier X was cleared for visual approach to runway 10 and established on final. Air carrier Y was on runway 9L final. Air carrier Y turned southeast and then sbound converging with air carrier X in less than 5 seconds. I called traffic or traffic alert to air carrier X. Air carrier X had air carrier Y in sight. By then the targets were merging and air carrier X and air carrier Y were both turning; and or taking other evasive action. I instructed air carrier X to maneuver as needed as I did not know what air carrier Y was doing. Eventually I had air carrier X turn southwest and climb to 4000 ft to establish separation from air carrier Y.

Original NASA ASRS Text

Title: A80 CTLR DESCRIBED INCIDENT AT 3000 FT AS ACFT SIDESTEPPING FROM RWY 9L TO RWY 9R OVERSHOT THE TURN AND CONFLICTED WITH TFC ON VISUAL APCH TO RWY 10.

Narrative: I WAS WORKING FINAL A POS; RUNNING MIXED ILS RWY 10 AND VISUAL APCH TO RWY 10. MY PARTNER WAS WORKING FINAL 'O' POS RUNNING ILS RWY 9L SIDESTEP TO RWY 9R. ACR X WAS CLRED FOR VISUAL APCH TO RWY 10 AND ESTABLISHED ON FINAL. ACR Y WAS ON RWY 9L FINAL. ACR Y TURNED SE AND THEN SBOUND CONVERGING WITH ACR X IN LESS THAN 5 SECONDS. I CALLED TFC OR TFC ALERT TO ACR X. ACR X HAD ACR Y IN SIGHT. BY THEN THE TARGETS WERE MERGING AND ACR X AND ACR Y WERE BOTH TURNING; AND OR TAKING OTHER EVASIVE ACTION. I INSTRUCTED ACR X TO MANEUVER AS NEEDED AS I DID NOT KNOW WHAT ACR Y WAS DOING. EVENTUALLY I HAD ACR X TURN SW AND CLB TO 4000 FT TO ESTABLISH SEPARATION FROM ACR Y.

Data retrieved from NASA's ASRS site as of January 2009 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.