Multiple runway operation parallel approachs. Air carrier Y non adherence to ATC clearance had near midair collision less than standard separation from air carrier X TCASII RA. Evasive action taken.

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Attributes
ACN	247547
Time
Date	199307
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : atl
State Reference	GA
Altitude	msl bound lower : 5500 msl bound upper : 5500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : atl
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 15000 flight time type : 7000
ASRS Report	247547
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 12000 flight time type : 1700
ASRS Report	246278
Events
Anomaly	conflict : nmac non adherence : clearance non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 0 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On approach into atl on air carrier X, we intercepted the runway 26R localizer at 6000 ft, as instructed by atl approach. We were cleared for the approach, and shortly thereafter, approach control asked if we had the traffic (air carrier Y) in sight off to our left on approach to 27L. We picked up the traffic visually and noticed his continued encroachment toward our altitude and flight path. Air carrier Y encroachment triggered a TCASII RA to climb, and we were simultaneously issued climb and turn instructions by atl approach. We then initiated a maximum effort climb and right turn. Air carrier Y passed directly underneath us at a maximum separation of 500 ft, and was in a considerable left banking turn back toward the southern runway complex. At no time had we strayed south of the runway 26R localizer, and we received no explanation as to why air carrier Y was so far north of the approach centerline of runway 27L. After evasive action, we continued the approach to a normal landing.

Original NASA ASRS Text

Title: MULTIPLE RWY OP PARALLEL APCHS. ACR Y NON ADHERENCE TO ATC CLRNC HAD NMAC LTSS FROM ACR X TCASII RA. EVASIVE ACTION TAKEN.

Narrative: ON APCH INTO ATL ON ACR X, WE INTERCEPTED THE RWY 26R LOC AT 6000 FT, AS INSTRUCTED BY ATL APCH. WE WERE CLRED FOR THE APCH, AND SHORTLY THEREAFTER, APCH CTL ASKED IF WE HAD THE TFC (ACR Y) IN SIGHT OFF TO OUR L ON APCH TO 27L. WE PICKED UP THE TFC VISUALLY AND NOTICED HIS CONTINUED ENCROACHMENT TOWARD OUR ALT AND FLT PATH. ACR Y ENCROACHMENT TRIGGERED A TCASII RA TO CLB, AND WE WERE SIMULTANEOUSLY ISSUED CLB AND TURN INSTRUCTIONS BY ATL APCH. WE THEN INITIATED A MAX EFFORT CLB AND R TURN. ACR Y PASSED DIRECTLY UNDERNEATH US AT A MAX SEPARATION OF 500 FT, AND WAS IN A CONSIDERABLE L BANKING TURN BACK TOWARD THE SOUTHERN RWY COMPLEX. AT NO TIME HAD WE STRAYED S OF THE RWY 26R LOC, AND WE RECEIVED NO EXPLANATION AS TO WHY ACR Y WAS SO FAR N OF THE APCH CTRLINE OF RWY 27L. AFTER EVASIVE ACTION, WE CONTINUED THE APCH TO A NORMAL LNDG.

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.