Small aircraft X less than standard separation from atx Y. System error.

Attributes
ACN	114724
Time
Date	198906
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mke
State Reference	WI
Altitude	msl bound lower : 6000 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mke
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Flight Phase	climbout : intermediate altitude
Route In Use	departure other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
ASRS Report	114724
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 6000 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Intra Facility Coordination Failure

Narrative:

I released small aircraft X off runway 15 at mwc on a 240 degree heading. On initial contact with small aircraft X I climbed him to 4000'. Then I turned him to 270 degree heading to go around the 'active descent area'. When I felt I had him far enough away from the west arrivals inbound at the time, I turned small aircraft X south and climbed him to 10,000'. The west arrival controller was working atx Y who was an arrival from the north at 8000 and was being vectored for the ILS runway 7R approach. The arrival controller vectored atx Y from a base onto the downwind and descended to 6000'. Small aircraft X was just climbing out of 6000' in front of him. Separation was lost to 1 NM. The arrival controller issued a 360 degree heading to increase separation and atx Y reported seeing the traffic. A large factor that contributed to the incident was my preoccupation with an emergency ongoing during this time. An aircraft was diverting from eus to mke and had a broken throttle cabe on his right engine. I spent a lot of time coordinating with aircraft, and my supervisor trying to help the aircraft in distress. Due to this preoccupation with aircraft I did not point out small aircraft X to the arrival controller after I noticed he was about 3 miles into the descent area. The situation was not noticed by the arrival controller or I until the collision alert system activated when the 2 aircraft were 1 1/2 NM apart. An earlier warning could have prevented the loss of separation. Supplemental information from acn 115099: I worked the atx Y on approach into milwaukee. The individual working the small aircraft X was working the departure position. I was vectoring the atx Y on the downwind to the ILS 7R approach. The atx Y was in my 'dump zone' at 6000'. I observed the small aircraft X at 5000' southbound in my dump zone without a pointout. As I was about to turn the atx Y southeast to the base, I observed the small aircraft X at 60 at 12 O'clock and 2 mi to the atx Y. I gave the atx Y turns to the northwest and then north as evasive action. The 2 aircraft came within 100' vertically and 1 mi laterally at the closest point.

Original NASA ASRS Text

Title: SMA X LESS THAN STANDARD SEPARATION FROM ATX Y. SYSTEM ERROR.

Narrative: I RELEASED SMA X OFF RWY 15 AT MWC ON A 240 DEG HDG. ON INITIAL CONTACT WITH SMA X I CLIMBED HIM TO 4000'. THEN I TURNED HIM TO 270 DEG HDG TO GO AROUND THE 'ACTIVE DESCENT AREA'. WHEN I FELT I HAD HIM FAR ENOUGH AWAY FROM THE WEST ARRIVALS INBND AT THE TIME, I TURNED SMA X SOUTH AND CLIMBED HIM TO 10,000'. THE WEST ARRIVAL CTLR WAS WORKING ATX Y WHO WAS AN ARRIVAL FROM THE NORTH AT 8000 AND WAS BEING VECTORED FOR THE ILS RWY 7R APCH. THE ARRIVAL CTLR VECTORED ATX Y FROM A BASE ONTO THE DOWNWIND AND DESCENDED TO 6000'. SMA X WAS JUST CLIMBING OUT OF 6000' IN FRONT OF HIM. SEPARATION WAS LOST TO 1 NM. THE ARRIVAL CTLR ISSUED A 360 DEG HDG TO INCREASE SEPARATION AND ATX Y REPORTED SEEING THE TFC. A LARGE FACTOR THAT CONTRIBUTED TO THE INCIDENT WAS MY PREOCCUPATION WITH AN EMER ONGOING DURING THIS TIME. AN ACFT WAS DIVERTING FROM EUS TO MKE AND HAD A BROKEN THROTTLE CABE ON HIS RIGHT ENGINE. I SPENT A LOT OF TIME COORDINATING WITH ACFT, AND MY SUPVR TRYING TO HELP THE ACFT IN DISTRESS. DUE TO THIS PREOCCUPATION WITH ACFT I DID NOT POINT OUT SMA X TO THE ARRIVAL CTLR AFTER I NOTICED HE WAS ABOUT 3 MILES INTO THE DSCNT AREA. THE SITUATION WAS NOT NOTICED BY THE ARRIVAL CTLR OR I UNTIL THE COLLISION ALERT SYSTEM ACTIVATED WHEN THE 2 ACFT WERE 1 1/2 NM APART. AN EARLIER WARNING COULD HAVE PREVENTED THE LOSS OF SEPARATION. SUPPLEMENTAL INFORMATION FROM ACN 115099: I WORKED THE ATX Y ON APCH INTO MILWAUKEE. THE INDIVIDUAL WORKING THE SMA X WAS WORKING THE DEP POSITION. I WAS VECTORING THE ATX Y ON THE DOWNWIND TO THE ILS 7R APCH. THE ATX Y WAS IN MY 'DUMP ZONE' AT 6000'. I OBSERVED THE SMA X AT 5000' SBND IN MY DUMP ZONE WITHOUT A POINTOUT. AS I WAS ABOUT TO TURN THE ATX Y SE TO THE BASE, I OBSERVED THE SMA X AT 60 AT 12 O'CLOCK AND 2 MI TO THE ATX Y. I GAVE THE ATX Y TURNS TO THE NW AND THEN NORTH AS EVASIVE ACTION. THE 2 ACFT CAME WITHIN 100' VERTICALLY AND 1 MI LATERALLY AT THE CLOSEST POINT.

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