N90 controller providing training described a near separation event between two successive lga depar...

Attributes
ACN	894550
Time
Date	201006
Local Time Of Day	1201-1800
Place
Locale Reference	N90.TRACON
State Reference	NY
Aircraft 1
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Departure
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types

Narrative:

A DH8 was climbing on a westerly heading after departing from lga. The next departure was an MD80 that was routed to the south. The trainee decided to both turn and climb the MD80 inside of the DH8. In order to use the situation as a training tool for the trainee I allowed the situation to play out expecting it to work; but to be something that we had to watch. I then noticed that the DH8 was more southerly than westerly and I had to take the frequency and issue an expedited turn and climb to the MD80 as well as turn the DH8 away. I issued traffic and we maintained positive separation but that was only due to the pilot's compliance with tightening their turn. Recommendation; training is a fine balance between letting the trainee work through a bad plan; and helping them make good plans. In this situation I should have immediately keyed up and stopped the MD80's climb. This would have allowed me to show the trainee how close they could have come if we had let them climb; instead of allowing a risky operation to continue.

Original NASA ASRS Text

Title: N90 Controller providing training described a near separation event between two successive LGA departures when the developmental attempted to turn a MD80 inside the previous DH8 departure.

Narrative: A DH8 was climbing on a westerly heading after departing from LGA. The next departure was an MD80 that was routed to the south. The trainee decided to both turn and climb the MD80 inside of the DH8. In order to use the situation as a training tool for the trainee I allowed the situation to play out expecting it to work; but to be something that we had to watch. I then noticed that the DH8 was more southerly than westerly and I had to take the frequency and issue an expedited turn and climb to the MD80 as well as turn the DH8 away. I issued traffic and we maintained positive separation but that was only due to the pilot's compliance with tightening their turn. Recommendation; training is a fine balance between letting the trainee work through a bad plan; and helping them make good plans. In this situation I should have immediately keyed up and stopped the MD80's climb. This would have allowed me to show the trainee how close they could have come if we had let them climb; instead of allowing a risky operation to continue.

Data retrieved from NASA's ASRS site as of April 2012 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.

N90 controller providing training described a near separation event between two successive lga departures when the developmental attempted to turn a MD80 inside the previous DH8 departure.