Small transport Y had less than standard separation from small aircraft Y. System error.

Attributes
ACN	134027
Time
Date	199001
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : osu
State Reference	OH
Altitude	msl bound lower : 1700 msl bound upper : 1700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cmh tower : cmh
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach descent other
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	departure other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
ASRS Report	134027
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	none taken : unable
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Small aircraft X on approach to osu airport, pointed out to cmh tower, this is to maintain separation. Tower turned small transport Y 300 degree, aircraft climbed to 17' leveled. Separation deteriorated to 2 NM at 17' 3 east of osu before small transport Y was found still on tower frequency. To resolve, tower must follow SOP.

Original NASA ASRS Text

Title: SMT Y HAD LESS THAN STANDARD SEPARATION FROM SMA Y. SYSTEM ERROR.

Narrative: SMA X ON APCH TO OSU ARPT, POINTED OUT TO CMH TWR, THIS IS TO MAINTAIN SEPARATION. TWR TURNED SMT Y 300 DEG, ACFT CLIMBED TO 17' LEVELED. SEPARATION DETERIORATED TO 2 NM AT 17' 3 E OF OSU BEFORE SMT Y WAS FOUND STILL ON TWR FREQ. TO RESOLVE, TWR MUST FOLLOW SOP.

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.