Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Situational Awareness
ATC Issue All Types; Conflict NMAC; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Took Evasive Action; Flight Crew Returned To Clearance; Flight Crew FLC complied w / Automation / Advisory
Received a climb RA while flying the [Runway] XXL RNAV X. We climbed at 1500-2000 FPM; a small civilian aircraft flew under our aircraft and missed us by 400 feet. We heard approach control give traffic advisory to the other aircraft for a '737'. We received no traffic advisories. I consider this event a near miss.No traffic advisories received from approach or vectoring to either aircraft to avoid the conflict.The Approach Controller needs to do their job. Not vector another aircraft into our aircraft. The pilot of the other aircraft should not take climbing vectors into a 737. (Day VFR Weather; 10 miles plus visibility)
Cleared RNAV (RNP) X [Runway] XXL at ZZZ and subsequently received a TCAS RA approaching ZZZZZ. A light civil aircraft called us in sight and approach told them to maintain visual separation. Light civil aircraft was being vectored by approach control when RA commanded a climb to which the Captain (Pilot Flying) executed. We never saw the aircraft but the TCAS display showed them 400 feet below us. When resolved we were cleared a visual approach and landing without further incident.
B737-800 flight crew reported an uneventful landing after an NMAC event requiring evasive maneuver during approach. No traffic information provided to flight crew.