Medium Transport
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Situational Awareness
Conflict NMAC; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance; Flight Crew Executed Go Around / Missed Approach; Flight Crew Took Evasive Action
Human Factors; Procedure
After intercepting the localizer for 22L at 2;000 feet MSL (1;960 AGL) and cleared for approach just outside ROSLY; we received instructions from ATC to climb to 2;500 simultaneously with a Traffic Advisory; and then Resolution Advisory from TCAS instructing us to climb. The FO (First Officer) immediately started climbing and I assisted with additional power input as well as calling out the RA instructions. As we reached 2;500 feet approximately 15 - 20 secs after first hearing RA I saw a helicopter fly underneath us at around 300 feet; passing from front left to rear right of aircraft. We were re-cleared for the approach and we landed without further incident.
Air carrier Captain reported executing a go-around from an approach to Runway 22L at JFK after an near mid-air collision with a helicopter.