Multiple runway operation parallel runways air carrier X TCASII RA had less than standard separation from Y. System error. Evasive action taken.

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Attributes
ACN	249415
Time
Date	199308
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : dfw
State Reference	TX
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller military : 4 controller non radar : 3 controller radar : 13
ASRS Report	249415
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : published procedure non adherence : clearance non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 9000 vertical : 1000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was working the east arrival control position which is responsible for the final approach course to runway 17L at dfw. Air carrier X was assigned a 230 degree heading, vector to the visual approach and descended from 5000 ft to 3000 ft. I asked him to report the airport in sight. I became distracted by numerous other aircraft on the frequency, and I don't remember whether or not I issued an approach clearance to air carrier X. Thinking that I had, I was about to switch air carrier X to the tower frequency, when he advised me of an RA from the TCASII, and that they were complying with it. Air carrier X climbed from 3000 ft to 5000 ft. The traffic confliction was with an aircraft Y on the runway 18R final approach course. Altitude readouts were not observed, at the time of the RA, by me. I believe that what caused the problem was my distraction by the other aircraft on frequency. If I had given air carrier X instructions to join the runway 17L localizer, he would not have gone through the final approach course in the event I did not issue the visual approach clearance.

Original NASA ASRS Text

Title: MULTIPLE RWY OP PARALLEL RWYS ACR X TCASII RA HAD LTSS FROM Y. SYS ERROR. EVASIVE ACTION TAKEN.

Narrative: I WAS WORKING THE E ARR CTL POS WHICH IS RESPONSIBLE FOR THE FINAL APCH COURSE TO RWY 17L AT DFW. ACR X WAS ASSIGNED A 230 DEG HDG, VECTOR TO THE VISUAL APCH AND DSNDED FROM 5000 FT TO 3000 FT. I ASKED HIM TO RPT THE ARPT IN SIGHT. I BECAME DISTRACTED BY NUMEROUS OTHER ACFT ON THE FREQ, AND I DON'T REMEMBER WHETHER OR NOT I ISSUED AN APCH CLRNC TO ACR X. THINKING THAT I HAD, I WAS ABOUT TO SWITCH ACR X TO THE TWR FREQ, WHEN HE ADVISED ME OF AN RA FROM THE TCASII, AND THAT THEY WERE COMPLYING WITH IT. ACR X CLBED FROM 3000 FT TO 5000 FT. THE TFC CONFLICTION WAS WITH AN ACFT Y ON THE RWY 18R FINAL APCH COURSE. ALT READOUTS WERE NOT OBSERVED, AT THE TIME OF THE RA, BY ME. I BELIEVE THAT WHAT CAUSED THE PROB WAS MY DISTR BY THE OTHER ACFT ON FREQ. IF I HAD GIVEN ACR X INSTRUCTIONS TO JOIN THE RWY 17L LOC, HE WOULD NOT HAVE GONE THROUGH THE FINAL APCH COURSE IN THE EVENT I DID NOT ISSUE THE VISUAL APCH CLRNC.

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.