<< >> NASA ASRS Report 701234, June 2006

L30 controller experienced less than standard separation at 9500 ft with 2 arrival aircraft when issuing turns. Incident occurred shortly after assuming position.

Attributes
ACN	701234
Time
Date	200606
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 9500
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : l30.tracon
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : l30.tracon
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : developmental
Experience	controller radar : 6 controller time certified in position2 : 2
ASRS Report	701234
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert other controllera
Resolutory Action	controller : issued alert controller : issued new clearance flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	vertical : 500
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I took over the position from another controller and immediately had to take action to avoid a conflict. I turned the trail aircraft; called traffic; and then turned back to follow. The aircraft turned very wide conflicting with another aircraft descending via another arrival. I attempted to correct with a turn and altitude but it was too late. What should I have done? Not taken the position until the original potential conflict was resolved. I perhaps should have not made so great of an initial turn and used altitude quicker on the third aircraft.

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Original NASA ASRS Text

Title: L30 CTLR EXPERIENCED LTSS AT 9500 FT WITH 2 ARR ACFT WHEN ISSUING TURNS. INCIDENT OCCURRED SHORTLY AFTER ASSUMING POS.

Narrative: I TOOK OVER THE POS FROM ANOTHER CTLR AND IMMEDIATELY HAD TO TAKE ACTION TO AVOID A CONFLICT. I TURNED THE TRAIL ACFT; CALLED TFC; AND THEN TURNED BACK TO FOLLOW. THE ACFT TURNED VERY WIDE CONFLICTING WITH ANOTHER ACFT DSNDING VIA ANOTHER ARR. I ATTEMPTED TO CORRECT WITH A TURN AND ALT BUT IT WAS TOO LATE. WHAT SHOULD I HAVE DONE? NOT TAKEN THE POS UNTIL THE ORIGINAL POTENTIAL CONFLICT WAS RESOLVED. I PERHAPS SHOULD HAVE NOT MADE SO GREAT OF AN INITIAL TURN AND USED ALT QUICKER ON THE THIRD ACFT.

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.