Separation was lost between cga and air carrier while attempting to establish visual separation.

Attributes
ACN	111511
Time
Date	198905
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bna
State Reference	TN
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bna
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent : approach descent other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other landing : go around
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
ASRS Report	111511
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact other
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

While working the final approach position with my trnee, we were vectoring air carrier X for runway 20R and cga Y for runway 20L. The cga Y had been cleared for the visibility approach and traffic issued on air carrier. Cga Y stated he did not see air carrier X and advised us he was switched to the tower frequency. Neither my trnee nor I heard the transmission: 'going to the tower,' so thinking that cga Y was still with us, we turned air carrier X toward the runway and cleared him for the approach, issuing him traffic on cga Y. Air carrier X did not see cga Y and was told to contact the tower. With 4 mi between the aircraft, we started calling cga Y and issuing air carrier X as traffic so he could get him in sight. It was at this time we realized that cga Y was not on our frequency. We then called the tower for help with visibility sep. They could not provide it because of the haze and broke the cga Y out. Results: 2 mi between the aircraft when cga Y started his go around.

Original NASA ASRS Text

Title: SEPARATION WAS LOST BETWEEN CGA AND ACR WHILE ATTEMPTING TO ESTABLISH VISUAL SEPARATION.

Narrative: WHILE WORKING THE FINAL APCH POS WITH MY TRNEE, WE WERE VECTORING ACR X FOR RWY 20R AND CGA Y FOR RWY 20L. THE CGA Y HAD BEEN CLRED FOR THE VIS APCH AND TFC ISSUED ON ACR. CGA Y STATED HE DID NOT SEE ACR X AND ADVISED US HE WAS SWITCHED TO THE TWR FREQ. NEITHER MY TRNEE NOR I HEARD THE XMISSION: 'GOING TO THE TWR,' SO THINKING THAT CGA Y WAS STILL WITH US, WE TURNED ACR X TOWARD THE RWY AND CLRED HIM FOR THE APCH, ISSUING HIM TFC ON CGA Y. ACR X DID NOT SEE CGA Y AND WAS TOLD TO CONTACT THE TWR. WITH 4 MI BTWN THE ACFT, WE STARTED CALLING CGA Y AND ISSUING ACR X AS TFC SO HE COULD GET HIM IN SIGHT. IT WAS AT THIS TIME WE REALIZED THAT CGA Y WAS NOT ON OUR FREQ. WE THEN CALLED THE TWR FOR HELP WITH VIS SEP. THEY COULD NOT PROVIDE IT BECAUSE OF THE HAZE AND BROKE THE CGA Y OUT. RESULTS: 2 MI BTWN THE ACFT WHEN CGA Y STARTED HIS GAR.

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.