TRACON controller described a conflict event resulting from a lack of awareness on the part of the t...

Narrative:

I was working south radar. Air carrier X was cleared for takeoff on the SID on runway 33 which requires leaving 600; turn left heading 300; climb to 4;000. Air carrier Y was cleared for takeoff shortly thereafter on the same departure. Air carrier Y appeared on radar about 2.5 miles in trail of air carrier X about 1;500 ft below. I noticed this situation at this time and immediately slid over to the north radar controller to inform them of the overtake in climb as air carrier Y was climbing faster than the previous aircraft. At this time separation was lost. Air carrier Y was then switched to departure and the north radar controller immediately turned the second aircraft (air carrier Y) thirty degrees to the left to re-acquire separation and issued traffic. The aircraft were both IMC at the time of the incident. This is the third overtake situation I have noticed in the past week with tower to departure. The first two I was able to fix without a loss of separation. I believe the controllers working in the tower need training on radar separation.

Original NASA ASRS Text

Title: TRACON Controller described a conflict event resulting from a lack of awareness on the part of the Tower; the Tower failing to provide adequate separation between two successive IFR departures.

Narrative: I was working South RADAR. Air Carrier X was cleared for takeoff on the SID on Runway 33 which requires leaving 600; turn left heading 300; climb to 4;000. Air Carrier Y was cleared for takeoff shortly thereafter on the same departure. Air Carrier Y appeared on RADAR about 2.5 miles in trail of Air Carrier X about 1;500 FT below. I noticed this situation at this time and immediately slid over to the North RADAR Controller to inform them of the overtake in climb as Air Carrier Y was climbing faster than the previous aircraft. At this time separation was lost. Air Carrier Y was then switched to Departure and the North RADAR Controller immediately turned the second aircraft (Air Carrier Y) thirty degrees to the left to re-acquire separation and issued traffic. The aircraft were both IMC at the time of the incident. This is the third overtake situation I have noticed in the past week with Tower to Departure. The first two I was able to fix without a loss of separation. I believe the controllers working in the Tower need training on RADAR separation.

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	1100860
Time
Date	201307
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	Saab 340 Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Flight Plan	IFR
Aircraft 2
Make Model Name	Saab 340 Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Flight Plan	IFR
Person 1
Function	Approach Departure
Qualification	Air Traffic Control Fully Certified
Person 2
Function	Departure Approach
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	Deviation - Procedural Published Material / Policy

TRACON controller described a conflict event resulting from a lack of awareness on the part of the tower; the tower failing to provide adequate separation between two successive IFR departures.