S56 handoff controller witnessed operational error at 11000 when controller failed to ensure separation between two arrival aircraft; one apparently on a visual approach.

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Attributes
ACN	788485
Time
Date	200805
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : s56.tracon
State Reference	UT
Altitude	msl single value : 11000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : s56.tracon
Operator	common carrier : air carrier
Make Model Name	MD-90 Series (DC-9-90) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : s56.tracon
Operator	common carrier : air carrier
Make Model Name	Regional Jet 200 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Experience	controller radar : 22 controller time certified in position1 : 7
ASRS Report	788485
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 18000 vertical : 0
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft X on downwind at 12000 ft. Aircraft Y inbound on QUINN2 arrival. Radar controller cleared aircraft Y for approach to cross plage at 11000 ft. Aircraft X descended to 11000 ft and then turned base in front of aircraft Y to a 070 degree heading. Aircraft X turned to a 010 degree heading and told to join the localizer runway 34R. Aircraft Y turned to a 030 degree heading and told to maintain 11000 ft for traffic. Separation lost. Aircraft X cleared for ILS runway 34R approach. Aircraft Y turned to 310 degree heading behind aircraft X. Aircraft Y cleared for ILS runway 34R approach.

Original NASA ASRS Text

Title: S56 HDOF CTLR WITNESSED OPERROR AT 11000 WHEN CTLR FAILED TO ENSURE SEPARATION BETWEEN TWO ARR ACFT; ONE APPARENTLY ON A VISUAL APCH.

Narrative: ACFT X ON DOWNWIND AT 12000 FT. ACFT Y INBOUND ON QUINN2 ARR. RADAR CTLR CLRED ACFT Y FOR APCH TO CROSS PLAGE AT 11000 FT. ACFT X DSNDED TO 11000 FT AND THEN TURNED BASE IN FRONT OF ACFT Y TO A 070 DEG HDG. ACFT X TURNED TO A 010 DEG HDG AND TOLD TO JOIN THE LOC RWY 34R. ACFT Y TURNED TO A 030 DEG HDG AND TOLD TO MAINTAIN 11000 FT FOR TFC. SEPARATION LOST. ACFT X CLRED FOR ILS RWY 34R APCH. ACFT Y TURNED TO 310 DEG HDG BEHIND ACFT X. ACFT Y CLRED FOR ILS RWY 34R APCH.

Data retrieved from NASA's ASRS site as of May 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.