Less than standard separation between air carrier X and air carrier Y. System error.

Attributes
ACN	126393
Time
Date	198910
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : dtw
State Reference	MI
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dtw artcc : zny
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other descent other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller military : 4 controller radar : 7
ASRS Report	126393
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : non radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	other other : unspecified atc
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 9000 vertical : 400
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

OJT instruction in progress. The developmental transposed call signs. He turned the wrong aircraft air carrier X accidentally. By the time the problem was noticed, air carrier X passed through his final and separation was lost with air carrier Y.

Original NASA ASRS Text

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

Narrative: OJT INSTRUCTION IN PROGRESS. THE DEVELOPMENTAL TRANSPOSED CALL SIGNS. HE TURNED THE WRONG ACFT ACR X ACCIDENTALLY. BY THE TIME THE PROBLEM WAS NOTICED, ACR X PASSED THROUGH HIS FINAL AND SEPARATION WAS LOST WITH ACR Y.

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.