ZNY controller reported having two aircraft; one VFR; one IFR and the IFR pilot receives an RA on th...

Narrative:

Aircraft X was proceeding direct to the freee intersection at 100 and converging with aircraft Y a VFR at 095. I called traffic for both aircraft (VFR eventually had aircraft X in sight before the RA) and when aircraft X approached aircraft Y they responded to an RA that they received on the VFR and climbed. Aircraft X informed me they were showing only 300 feet between the two. I looked at my radar and it showed the VFR at 096 and aircraft X at 099. This is normal to see when you have an interim altitude in the data block to see an aircraft indicating a 100 feet below. Aircraft X pilot asked me to have the VFR to check his altimeter setting which I did and to verify level at 095. I don't believe I got a response as I moved on to other clearances. Aircraft X reported clear and descended back to 100 and was handed off to approach control. A few minutes later I noticed the VFR altitude at 096 again and I asked to verify at 095 and the pilot confirmed. After landing aircraft X pilot called and spoke to supervisor as a courtesy call and stated they showed the VFR at 097 when responding to the RA and thought I could have been a little more proactive. They said they asked me to confirm VFR altimeter setting and that I never did it. I did do that and they must have missed it on the frequency.I don't have any recommendations for this event. I called traffic a few times for these aircraft and the VFR had the aircraft X in sight.

Original NASA ASRS Text

Title: ZNY Controller reported having two aircraft; one VFR; one IFR and the IFR pilot receives an RA on the VFR aircraft which has him in sight. Pilot calls facility to complain that the controller didn't do a good enough job.

Narrative: Aircraft X was proceeding direct to the FREEE intersection at 100 and converging with Aircraft Y a VFR at 095. I called traffic for both aircraft (VFR eventually had Aircraft X in sight before the RA) and when Aircraft X approached Aircraft Y they responded to an RA that they received on the VFR and climbed. Aircraft X informed me they were showing only 300 feet between the two. I looked at my radar and it showed the VFR at 096 and Aircraft X at 099. This is normal to see when you have an interim altitude in the data block to see an aircraft indicating a 100 feet below. Aircraft X pilot asked me to have the VFR to check his altimeter setting which I did and to verify level at 095. I don't believe I got a response as I moved on to other clearances. Aircraft X reported clear and descended back to 100 and was handed off to approach control. A few minutes later I noticed the VFR altitude at 096 again and I asked to verify at 095 and the pilot confirmed. After landing Aircraft X pilot called and spoke to supervisor as a courtesy call and stated they showed the VFR at 097 when responding to the RA and thought I could have been a little more proactive. They said they asked me to confirm VFR altimeter setting and that I never did it. I did do that and they must have missed it on the frequency.I don't have any recommendations for this event. I called traffic a few times for these aircraft and the VFR had the Aircraft X in sight.

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.

Attributes
ACN	1227947
Time
Date	201412
Local Time Of Day	1201-1800
Place
Locale Reference	ZNY.ARTCC
State Reference	NY
Environment
Light	Daylight
Aircraft 1
Make Model Name	Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft Low Wing 1 Eng Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Flight Plan	VFR
Person 1
Function	Enroute
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 8.5
Events
Anomaly	Conflict NMAC

ZNY controller reported having two aircraft; one VFR; one IFR and the IFR pilot receives an RA on the VFR aircraft which has him in sight. Pilot calls facility to complain that the controller didn't do a good enough job.