Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Type 423
Situational Awareness
Conflict Airborne Conflict
Flight Crew Returned To Clearance; Flight Crew Took Evasive Action
Airport
On vectors to ZZZ in the vicinity of ZZZZZ waypoint cleared to and level at 8;000 ft. Traffic was reported VFR at 7;500 ft. Autopilot was on and we were Alt Hold at 8;000 ft. Never got a visual of the traffic but TCAS showed it 500 ft. below. TCAS momentarily showed traffic at 400 ft. below which triggered a TCAS RA. We disconnected the autopilot and auto throttles and followed the RA climbing approximately 250 ft. Almost immediately TCAS reported clear of traffic. We simultaneously reported the RA to ATC and they also showed us clear of traffic. We then continued our approach. ATC reported the traffic prior to the event and told us to expect lower once clear. It was a light civil that had us in sight but we never got a visual on them. We were coming over the mountains and it is possible thermals might have caused the light civil to momentary climb causing the RA. Our instruments showed us steady at 8;000 ft.
We were cleared for the visual and cleared to land on Runway XXR by Tower. We were descending on profile when Tower reported traffic at our ten o'clock 700 feet below type unknown. I immediately leveled off and went high on the approach and started my scan for the traffic. TCAS also showed the traffic 700 feet below. I finally got a visual on the traffic just before we went over the top of them. The traffic continued north as we were heading west to land on Runway XXR. Because we were clear of the traffic we continued down on the approach now high. We were able to get back on path and make a stable approach to landing.
Flight crew reported a TCAS RA event while on approach.