N90 controller described a loss of separation event when attempting to climb a jet in front of a pro...

Attributes
ACN	924599
Time
Date	201012
Local Time Of Day	1201-1800
Place
Locale Reference	N90.TRACON
State Reference	NY
Aircraft 1
Make Model Name	Super King Air 300
Flight Phase	Climb
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Cessna Citation Mustang (C510)
Flight Phase	Climb
Person 1
Function	Departure
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy

Narrative:

A BE30 departed teb and level at 13;00 ft. A citation mustang departed dxr that I climbed to 12;000 initially. Both aircraft were on same course flying direct merit intersection. I waited until the jet was more than 3 miles in front of the BE30; in fact I measured 3.06 miles before I climbed jet to 16;000 through the altitude of the BE30. I remember commenting to controller next to me that I wasted 0.06 miles of airspace. While calling traffic to the BE30; the pilot stated that he could maintain visual separation. My response was thanks but it's not needed. The ground speed of the C510 was 10-20 KTS faster than the BE30. Recommendation; next time I'll give myself a little more cushion factor.

Original NASA ASRS Text

Title: N90 Controller described a loss of separation event when attempting to climb a jet in front of a propeller aircraft but misjudging the distance required to secure RADAR separation.

Narrative: A BE30 departed TEB and level at 13;00 FT. A Citation Mustang departed DXR that I climbed to 12;000 initially. Both aircraft were on same course flying direct MERIT Intersection. I waited until the jet was more than 3 miles in front of the BE30; in fact I measured 3.06 miles before I climbed jet to 16;000 through the altitude of the BE30. I remember commenting to Controller next to me that I wasted 0.06 miles of airspace. While calling traffic to the BE30; the pilot stated that he could maintain visual separation. My response was thanks but it's not needed. The ground speed of the C510 was 10-20 KTS faster than the BE30. Recommendation; next time I'll give myself a little more cushion factor.

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 described a loss of separation event when attempting to climb a jet in front of a propeller aircraft but misjudging the distance required to secure radar separation.