Loss of separation occurs at bna TRACON during controller relief.

Attributes
ACN	584627
Time
Date	200306
Day	Sun
Place
Locale Reference	airport : bna.airport
State Reference	TN
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bna.tracon tower : cos.tower
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Aircraft 2
Controlling Facilities	tracon : bna.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : approach
Route In Use	approach : visual
Person 1
Affiliation	government : faa
Function	controller : approach instruction : instructor
Qualification	controller : radar
Experience	controller non radar : 3 controller radar : 18 flight time total : 5500
ASRS Report	584627
Person 2
Affiliation	government : faa
Function	instruction : trainee
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : insufficient time
Consequence	faa : investigated
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was relieving another controller on departure radar west with my trainee. During the position relief briefing, separation was lost between 2 aircraft inbound. It was not my or the trainee's error but the relieving controller who did not ensure separation.

Original NASA ASRS Text

Title: LOSS OF SEPARATION OCCURS AT BNA TRACON DURING CTLR RELIEF.

Narrative: I WAS RELIEVING ANOTHER CTLR ON DEP RADAR W WITH MY TRAINEE. DURING THE POS RELIEF BRIEFING, SEPARATION WAS LOST BTWN 2 ACFT INBOUND. IT WAS NOT MY OR THE TRAINEE'S ERROR BUT THE RELIEVING CTLR WHO DID NOT ENSURE SEPARATION.

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.