A80 controller experienced operational error when an aircraft on visual approach failed to turn toward the assigned runway and conflicted with traffic on opposite base leg.

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Attributes
ACN	675679
Time
Date	200508
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : atl.airport
State Reference	GA
Altitude	msl single value : 2200
Environment
Flight Conditions	Marginal
Light	Dawn
Aircraft 1
Controlling Facilities	tracon : a80.tracon
Operator	common carrier : air carrier
Make Model Name	B737 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	MD-80 Series (DC-9-80) 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 : non radar
Experience	controller radar : 29 controller time certified in position1 : 4
ASRS Report	675679
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne critical non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 7000 vertical : 600
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft #2 was on a visual approach to south parallel runways. Aircraft #1 was on a vector to the north parallel; did not call the runway in sight; and flew through the localizer (was not told to join); and was turned back to the north parallel. Separation was lost when vectored back to the north parallel runways. Visibility had decreased with haze and the rising sun. Incident could have been prevented by instructing aircraft #1 to join the localizer. Previous aircraft had no problems calling the runway for visual approachs. Pilot in aircraft #1 did not question about joining the localizer even though asked 2-3 times if they had the field in sight; nor did they question via TCASII of traffic on south parallel.

Original NASA ASRS Text

Title: A80 CTLR EXPERIENCED OPERROR WHEN AN ACFT ON VISUAL APCH FAILED TO TURN TOWARD THE ASSIGNED RWY AND CONFLICTED WITH TFC ON OPPOSITE BASE LEG.

Narrative: ACFT #2 WAS ON A VISUAL APCH TO S PARALLEL RWYS. ACFT #1 WAS ON A VECTOR TO THE N PARALLEL; DID NOT CALL THE RWY IN SIGHT; AND FLEW THROUGH THE LOC (WAS NOT TOLD TO JOIN); AND WAS TURNED BACK TO THE N PARALLEL. SEPARATION WAS LOST WHEN VECTORED BACK TO THE N PARALLEL RWYS. VISIBILITY HAD DECREASED WITH HAZE AND THE RISING SUN. INCIDENT COULD HAVE BEEN PREVENTED BY INSTRUCTING ACFT #1 TO JOIN THE LOC. PREVIOUS ACFT HAD NO PROBS CALLING THE RWY FOR VISUAL APCHS. PLT IN ACFT #1 DID NOT QUESTION ABOUT JOINING THE LOC EVEN THOUGH ASKED 2-3 TIMES IF THEY HAD THE FIELD IN SIGHT; NOR DID THEY QUESTION VIA TCASII OF TFC ON S PARALLEL.

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.