TRACON controller providing OJT described a confused sequence event and potential conflict when a le...

Narrative:

I was training a developmental on the G scope. The developmental told a lear on the downwind to the airport that their sequence was another lear at 11 o'clock and 6 miles; 2 miles west of zzzzz. The lear on the down wind reported the other lear in sight. The developmental instructed the lear to follow the traffic; cleared visual approach to runway xx. After acknowledging the clearance; the lear pilot requested to be switched to the tower. The developmental switched the lear to the tower frequency. I then immediately told the developmental to call the tower and coordinate the visual approach because we could not ensure that the lear on the visual approach would be established on a 7 mile final per LOA. The tower said unable and that the 2nd lear was turning base early and following the wrong aircraft. Had the lear followed the correct traffic; coordination would most likely not be needed and separation would have been ensured.

Original NASA ASRS Text

Title: TRACON Controller providing OJT described a confused sequence event and potential conflict when a Lear was cleared for a Visual Approach to follow another Lear on final; but cut in front of the straight in traffic.

Narrative: I was training a Developmental on the G scope. The Developmental told a Lear on the downwind to the airport that their sequence was another Lear at 11 o'clock and 6 miles; 2 miles west of ZZZZZ. The Lear on the down wind reported the other Lear in sight. The Developmental instructed the Lear to follow the traffic; cleared Visual Approach to Runway XX. After acknowledging the clearance; the Lear pilot requested to be switched to the Tower. The Developmental switched the Lear to the Tower frequency. I then immediately told the Developmental to call the Tower and coordinate the Visual Approach because we could not ensure that the Lear on the Visual Approach would be established on a 7 mile final per LOA. The Tower said unable and that the 2nd Lear was turning base early and following the wrong aircraft. Had the Lear followed the correct traffic; coordination would most likely not be needed and separation would have been ensured.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	992012
Time
Date	201202
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	Bombardier Learjet Undifferentiated or Other Model
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Bombardier Learjet Undifferentiated or Other Model
Flight Phase	Final Approach
Flight Plan	IFR
Person 1
Function	Departure Approach
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Procedural Clearance Deviation - Track / Heading All Types

TRACON controller providing OJT described a confused sequence event and potential conflict when a lear was cleared for a visual approach to follow another lear on final; but cut in front of the straight in traffic.