Air carrier flight crew reported a NMAC with another aircraft on approach.
Synopsis
Air carrier flight crew reported a NMAC with another aircraft on approach.
Narrative
Approaching from the Northwest of ZZZ; approach gave Company X an option for a visual approach to Runway XX; instead of Runway XYR; as depicted on the ZZZZZ 5 RNAV ARRIVAL. We accepted and were given an assigned heading after ZZZZZ1; which we complied with.Additionally; we were given clearance to descend to 6;000 ft. and slow to 170 kts.; which was complied with.Following an assigned heading of 180; approached verified we had the airport in sight and cleared us via a visual approach to Runway XX. Approach Control additionally cautioned us about flying behind a 'heavy' jet that was on final approach to Runway XYL. The caution was noted.Approach cleared us to continue our descent to 3;000 ft. before clearing the flight for a visual approach. The flight path proceeded with a dog leg Just prior to ZZZZZ2; the captain asked for 1;500 ft. to be selected on the MCP to comply with the altitude at ZZZZZ3 as he continued the descent. We received a resolution advisory (RA) 'Monitor vertical speed' as we noticed a high-wing Cessna orbiting at about 1;500. There was no ATC warning of an orbiting aircraft on the final approach at 1;500; which was outside the Class B Airspace.Flight Company XXXX descent below 2;000 ft. also brought the aircraft below the Class B tier just east of ZZZZZ2.The Captain complied with the RA as it continued with 'Maintain vertical speed'; until we received the 'Clear of Conflict' aural alert.Glancing down to my Map display; the Cessna was pegged at 300 ft. below our altitude.We promptly notified approach control about the RA and the Cessna traffic.The flight continued to land and park without further incident.
Second reporter narrative
While descending on a visual approach to Runway XX we were descending to 1500 ft. and there was a light single engine aircraft operating below the Class B airspace at approximately 1500 ft. We were not advised by ATC of said aircraft before we received a TCAS TA. Then TCAS RA told us to level off and we avoided the light single aircraft by approximately 300 ft. I inadvertently descended too early and subsequently exited Class B airspace.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.