Tpa local controller released an IFR B190 immediately behind a small sel aircraft VFR in class B airspace resulting in an operational error.

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Attributes
ACN	569729
Time
Date	200212
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : tpa.airport
State Reference	FL
Altitude	agl single value : 2600
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : tpa.tracon
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	VFR
Aircraft 2
Controlling Facilities	tracon : tpa.tracon
Operator	common carrier : air taxi
Make Model Name	Beech 1900
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Experience	controller military : 4 controller non radar : 2 controller radar : 20 controller time certified in position1 : 6
ASRS Report	569729
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	conflict : airborne critical non adherence : published procedure
Independent Detector	atc equipment other atc equipment : radar other controllera other controllerb other flight crewa other flight crewb other other : 5
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Miss Distance	horizontal : 0 vertical : 1500
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Tampa tower released a small single engine aircraft off runway 18L heading 180 degrees, climbing VFR to 5500 ft. Almost immediately, they released a twin turboprop commuter B190 behind the single climbing to 6000 ft. The way that the aircraft acquire on the south departure scope is not good. We work that sector off the sarasota radar system, and it takes longer for aircraft off tampa to acquire and become radar contact. Once I idented the second aircraft, he was traveling much faster than the lead aircraft, and I had to take evasive action by turning the first aircraft left to a 120 degree heading, and turning the second aircraft right to a 200 degree heading.. There are some other airspace aspects that came into play restricting the way I could vector these aircraft from becoming a potential accident. They got within 1/4 mi of each other, I would estimate.

Original NASA ASRS Text

Title: TPA LCL CTLR RELEASED AN IFR B190 IMMEDIATELY BEHIND A SMALL SEL ACFT VFR IN CLASS B AIRSPACE RESULTING IN AN OPERROR.

Narrative: TAMPA TWR RELEASED A SMALL SINGLE ENG ACFT OFF RWY 18L HDG 180 DEGS, CLBING VFR TO 5500 FT. ALMOST IMMEDIATELY, THEY RELEASED A TWIN TURBOPROP COMMUTER B190 BEHIND THE SINGLE CLBING TO 6000 FT. THE WAY THAT THE ACFT ACQUIRE ON THE S DEP SCOPE IS NOT GOOD. WE WORK THAT SECTOR OFF THE SARASOTA RADAR SYS, AND IT TAKES LONGER FOR ACFT OFF TAMPA TO ACQUIRE AND BECOME RADAR CONTACT. ONCE I IDENTED THE SECOND ACFT, HE WAS TRAVELING MUCH FASTER THAN THE LEAD ACFT, AND I HAD TO TAKE EVASIVE ACTION BY TURNING THE FIRST ACFT L TO A 120 DEG HDG, AND TURNING THE SECOND ACFT R TO A 200 DEG HDG.. THERE ARE SOME OTHER AIRSPACE ASPECTS THAT CAME INTO PLAY RESTRICTING THE WAY I COULD VECTOR THESE ACFT FROM BECOMING A POTENTIAL ACCIDENT. THEY GOT WITHIN 1/4 MI OF EACH OTHER, I WOULD ESTIMATE.

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