A321
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Communication Breakdown; Situational Awareness
ATC Issue All Types; Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Flight Crew Took Evasive Action
Airspace Structure; Environment - Non Weather Related; Human Factors
Arriving JFK visual approach 22L. Radar vectors being given. Received traffic advisory followed immediately by resolution advisory to descend 800 ft. a minute. Aircraft passed directly above our aircraft by 400 ft. as verified only by information on primary flight display. Reported to ATC and were given new heading vector to continue the approach without further incident. Air Traffic Control never pointed out this traffic to us. However they knew he was in the area once we declared executing the RA.
A321 Captain reported that while on visual approach to landing; TA followed by RA caused NMAC; verified only by information on PFD.