<< >> NASA ASRS Report 714356, October 2006

Mem TRACON controller described a number of conflict alert events during simultaneous ILS runway 18L and runway 18R operations.

Attributes
ACN	714356
Time
Date	200610
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mem.airport
State Reference	TN
Altitude	msl bound lower : 2000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Weather Elements	Rain
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller military : 4 controller radar : 18 controller time certified in position1 : 1
ASRS Report	714356
Events
Anomaly	other anomaly other
Independent Detector	atc equipment : conflict alert other controllera
Resolutory Action	none taken : anomaly accepted
Miss Distance	horizontal : 6000 vertical : 300
Supplementary
Problem Areas	FAA
Primary Problem	FAA
Situations
ATC Facility	radar equipment : mem.tower

Narrative:

I was working final monitor west on the shift during the inbound. Mem was operating in a south confign; advertising simultaneous ILS runway 18L and runway 18R. While not advertised on the ATIS; some aircraft were issued ILS runway 27. During this period; I noticed numerous conflict alerts while we were conducting the simultaneous ILS approachs to runway 18L and runway 18R. The conflict alert appeared to go off as the higher aircraft descended to the altitude of the aircraft that was next to it on the parallel final approach course. I was able to document three pairs of aircraft where the conflict alert activated. These 3 pairs of aircraft were within 1 - 1 1/2 mi staggered on parallel ILS final approach courses. Targets appears to be established and centered on the localizer. The conflict alert goes off so often here; that we are often desensitized to the visual and aural alarm; especially when the alert happens on the final approach courses.

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Original NASA ASRS Text

Title: MEM TRACON CTLR DESCRIBED A NUMBER OF CONFLICT ALERT EVENTS DURING SIMULTANEOUS ILS RWY 18L AND RWY 18R OPS.

Narrative: I WAS WORKING FINAL MONITOR W ON THE SHIFT DURING THE INBOUND. MEM WAS OPERATING IN A S CONFIGN; ADVERTISING SIMULTANEOUS ILS RWY 18L AND RWY 18R. WHILE NOT ADVERTISED ON THE ATIS; SOME ACFT WERE ISSUED ILS RWY 27. DURING THIS PERIOD; I NOTICED NUMEROUS CONFLICT ALERTS WHILE WE WERE CONDUCTING THE SIMULTANEOUS ILS APCHS TO RWY 18L AND RWY 18R. THE CONFLICT ALERT APPEARED TO GO OFF AS THE HIGHER ACFT DSNDED TO THE ALT OF THE ACFT THAT WAS NEXT TO IT ON THE PARALLEL FINAL APCH COURSE. I WAS ABLE TO DOCUMENT THREE PAIRS OF ACFT WHERE THE CONFLICT ALERT ACTIVATED. THESE 3 PAIRS OF ACFT WERE WITHIN 1 - 1 1/2 MI STAGGERED ON PARALLEL ILS FINAL APCH COURSES. TARGETS APPEARS TO BE ESTABLISHED AND CTRED ON THE LOC. THE CONFLICT ALERT GOES OFF SO OFTEN HERE; THAT WE ARE OFTEN DESENSITIZED TO THE VISUAL AND AURAL ALARM; ESPECIALLY WHEN THE ALERT HAPPENS ON THE FINAL APCH COURSES.

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.