Large transport was cleared for visual approach during marginal approach conditions and was allowed to get closer than 3 miles to an small transport also making an approach without having the aircraft in sight. Operational error.

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Attributes
ACN	102594
Time
Date	198901
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : pbi
State Reference	FL
Altitude	msl bound lower : 1500 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : pbi
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
ASRS Report	102594
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 15000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

An large transport 5 northwest of pbi turned southbound 180 degree for a visual approach runway 9L. Aircraft was descended from 4000' to 1500'. Approximately 10 southwest of airport an small transport had been given a visual approach to runway 9R. The large transport was slow descending and did not see the airport until almost abeam airport. At that time I gave clearance for visual approach to runway 9L. The large transport was overshooting the final in a left turn for the airport when I advised him of the small transport southwest of the airport. The large transport had to be climbed and resequenced to avoid the small transport.

Original NASA ASRS Text

Title: LGT WAS CLEARED FOR VISUAL APCH DURING MARGINAL APCH CONDITIONS AND WAS ALLOWED TO GET CLOSER THAN 3 MILES TO AN SMT ALSO MAKING AN APCH WITHOUT HAVING THE ACFT IN SIGHT. OPERATIONAL ERROR.

Narrative: AN LGT 5 NW OF PBI TURNED SBND 180 DEG FOR A VISUAL APCH RWY 9L. ACFT WAS DSNDED FROM 4000' TO 1500'. APPROX 10 SW OF ARPT AN SMT HAD BEEN GIVEN A VISUAL APCH TO RWY 9R. THE LGT WAS SLOW DSNDING AND DID NOT SEE THE ARPT UNTIL ALMOST ABEAM ARPT. AT THAT TIME I GAVE CLRNC FOR VISUAL APCH TO RWY 9L. THE LGT WAS OVERSHOOTING THE FINAL IN A L TURN FOR THE ARPT WHEN I ADVISED HIM OF THE SMT SW OF THE ARPT. THE LGT HAD TO BE CLBED AND RESEQUENCED TO AVOID THE SMT.

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.