An large transport air carrier aircraft TCASII RA warning during final approach to 1 of 4 parallel runways caused by an light transport air carrier aircraft overshooting the final turn to one of the adjacent runways. No evasive action taken since other aircraft in sight.

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Attributes
ACN	237203
Time
Date	199303
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl
State Reference	GA
Altitude	msl bound lower : 2100 msl bound upper : 2100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : atl
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent : approach
Route In Use	approach : visual arrival other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent : approach
Route In Use	approach : visual arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 100 flight time total : 5000 flight time type : 100
ASRS Report	237203
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 147 flight time total : 12337 flight time type : 8287
ASRS Report	237321
Events
Anomaly	conflict : airborne less severe incursion : runway non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

The problem ctrs around the inability of TCASII to provide horizontal RA guidance when a conflict arises during a parallel approach. Our aircraft was established on centerline (at 1000 ft AGL), visual approach, runway 8R atl, at 3 NM from threshold. An intruder aircraft (a low fixed wing, turbo propeller, scheduled carrier) was turning final for a visual approach to runway 9L atl (a parallel runway, south complex). Atl tower advised that the intruder aircraft overshot the turn to final. This caused a TCASII RA. The ivsi RA displayed 'red' from 4000 FPM climb to 2500 FPM descent with no 'green' escape maneuver area displayed. Because TCASII does not offer horizontal escape capability the TCASII in effect, was not able to resolve the conflict. Because we continuously had visual contact with the intruder, and could see that the aircraft was in fact turning to intercept the runway 9L centerline, it was not necessary to execute an escape maneuver. As soon as the intruder was established back on the runway 9L extended centerline, the TCASII stopped issuing the RA.

Original NASA ASRS Text

Title: AN LGT ACR ACFT TCASII RA WARNING DURING FINAL APCH TO 1 OF 4 PARALLEL RWYS CAUSED BY AN LTT ACR ACFT OVERSHOOTING THE FINAL TURN TO ONE OF THE ADJACENT RWYS. NO EVASIVE ACTION TAKEN SINCE OTHER ACFT IN SIGHT.

Narrative: THE PROB CTRS AROUND THE INABILITY OF TCASII TO PROVIDE HORIZ RA GUIDANCE WHEN A CONFLICT ARISES DURING A PARALLEL APCH. OUR ACFT WAS ESTABLISHED ON CTRLINE (AT 1000 FT AGL), VISUAL APCH, RWY 8R ATL, AT 3 NM FROM THRESHOLD. AN INTRUDER ACFT (A LOW FIXED WING, TURBO PROP, SCHEDULED CARRIER) WAS TURNING FINAL FOR A VISUAL APCH TO RWY 9L ATL (A PARALLEL RWY, S COMPLEX). ATL TWR ADVISED THAT THE INTRUDER ACFT OVERSHOT THE TURN TO FINAL. THIS CAUSED A TCASII RA. THE IVSI RA DISPLAYED 'RED' FROM 4000 FPM CLB TO 2500 FPM DSCNT WITH NO 'GREEN' ESCAPE MANEUVER AREA DISPLAYED. BECAUSE TCASII DOES NOT OFFER HORIZ ESCAPE CAPABILITY THE TCASII IN EFFECT, WAS NOT ABLE TO RESOLVE THE CONFLICT. BECAUSE WE CONTINUOUSLY HAD VISUAL CONTACT WITH THE INTRUDER, AND COULD SEE THAT THE ACFT WAS IN FACT TURNING TO INTERCEPT THE RWY 9L CTRLINE, IT WAS NOT NECESSARY TO EXECUTE AN ESCAPE MANEUVER. AS SOON AS THE INTRUDER WAS ESTABLISHED BACK ON THE RWY 9L EXTENDED CTRLINE, THE TCASII STOPPED ISSUING THE RA.

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.