Narrative:

Busy session on final landing the expressway visual approach to runway 31. My final started to get backed up and I needed to vector northbound over manhattan for spacing. Aircraft X was eastbound over manhattan at 3;000 feet when I cleared him for the approach. The approach clearance instructed him to cross dials; which was about 3 miles east of his position; at or above 2;500 feet. In between this aircraft and dials; aircraft Y was level at 1;900 feet at the border between lga tower's airspace and my own. Aircraft X descended to 2;500 feet; directly overhead of aircraft Y at 1;900 feet.when lga is landing left traffic to runway 4 the tower may only work VFR aircraft at 2;000 feet up to the lga 240 radial. When lga is landing left traffic to runway 31 the tower may work VFR aircraft at 2;000 feet up the lga 230 radial. Even though it's only a 10 degree difference; in such tight airspace it makes a very big difference. If aircraft Y was west of the lga 240 radial there would not have been a problem. I recommend the tower's airspace be restricted to the lga 240 radial when landing left traffic to runway 3.

Google
 

Original NASA ASRS Text

Title: N90 Controller makes a request to change airspace related to IFR operations and VFR Helicopter operations.

Narrative: Busy session on final landing the Expressway Visual Approach to Runway 31. My final started to get backed up and I needed to vector northbound over Manhattan for spacing. Aircraft X was eastbound over Manhattan at 3;000 feet when I cleared him for the approach. The approach clearance instructed him to cross DIALS; which was about 3 miles east of his position; at or above 2;500 feet. In between this aircraft and DIALS; Aircraft Y was level at 1;900 feet at the border between LGA Tower's airspace and my own. Aircraft X descended to 2;500 feet; directly overhead of Aircraft Y at 1;900 feet.When LGA is landing left traffic to Runway 4 the Tower may only work VFR aircraft at 2;000 feet up to the LGA 240 radial. When LGA is landing left traffic to Runway 31 the Tower may work VFR aircraft at 2;000 feet up the LGA 230 radial. Even though it's only a 10 degree difference; in such tight airspace it makes a very big difference. If Aircraft Y was west of the LGA 240 radial there would not have been a problem. I recommend the Tower's airspace be restricted to the LGA 240 radial when landing left traffic to Runway 3.

Data retrieved from NASA's ASRS site 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.