Less than standard separation between small transport X and small aircraft Y. System error.

Attributes
ACN	127567
Time
Date	198911
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : spg
State Reference	FL
Altitude	msl bound lower : 1600 msl bound upper : 1600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : spg
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent other landing other
Route In Use	approach : straight in
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Experience	controller military : 1 controller non radar : 3 controller radar : 1
ASRS Report	127567
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 1500 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was working local control position with an small aircraft on short final, an small transport X on 2 mi final and 3 aircraft on the downwind to follow small transport X. Tpa approach had given us an IFR V.a. Inbound. Tpa switched the IFR V.a. To us 2 mi north of the airport at 1600'. The aircraft was small aircraft Y. The small transport X on 2 mi final had to make a left 360 degree to avoid the IFR small aircraft Y to his right. At that time, he turned into the traffic on downwind. The small transport X initiated the 360 degree turn on his own. The cause of this situation was a late handoff communication transfer from tpa approach. There was no coordination from tpa allowing the small aircraft Y visibility approach to enter spg's air traffic area. The solution is for tpa to switch IFR inbnds in a timely fashion to spg tower for proper sequencing.

Original NASA ASRS Text

Title: LESS THAN STANDARD SEPARATION BETWEEN SMT X AND SMA Y. SYSTEM ERROR.

Narrative: I WAS WORKING LCL CTL POS WITH AN SMA ON SHORT FINAL, AN SMT X ON 2 MI FINAL AND 3 ACFT ON THE DOWNWIND TO FOLLOW SMT X. TPA APCH HAD GIVEN US AN IFR V.A. INBND. TPA SWITCHED THE IFR V.A. TO US 2 MI N OF THE ARPT AT 1600'. THE ACFT WAS SMA Y. THE SMT X ON 2 MI FINAL HAD TO MAKE A LEFT 360 DEG TO AVOID THE IFR SMA Y TO HIS RIGHT. AT THAT TIME, HE TURNED INTO THE TFC ON DOWNWIND. THE SMT X INITIATED THE 360 DEG TURN ON HIS OWN. THE CAUSE OF THIS SITUATION WAS A LATE HDOF COM TRANSFER FROM TPA APCH. THERE WAS NO COORD FROM TPA ALLOWING THE SMA Y VIS APCH TO ENTER SPG'S ATA. THE SOLUTION IS FOR TPA TO SWITCH IFR INBNDS IN A TIMELY FASHION TO SPG TWR FOR PROPER SEQUENCING.

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.