A319
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 129; Flight Crew Type 4536
Situational Awareness
Conflict Airborne Conflict; Deviation - Altitude Excursion From Assigned Altitude
Flight Crew FLC complied w / Automation / Advisory
Human Factors; Procedure
Being vectored to final by approach control to ILS 28L at PIT. Saw TCAS target 2 1/2 NM ahead of aircraft 400 feet below aircraft. Approach control never told us about traffic. Target appeared to be moving right to left away from our aircraft; but we then got TA alert. We both looked outside the aircraft to acquire the target visually. The FO saw the aircraft and then we got an RA climb which we immediately complied with and notified ATC of a TCAS RA climb. I then saw the single engine private aircraft circling back toward our aircraft at our 9-9:30 direction. Not sure of exact distance to aircraft because we concentrated on the RA profile compliance. Once clear of conflict we continued the approach. We climbed approximately 250-300 feet in compliance with the RA.
We were at 4;000 feet being vectored to intercept the localizer for an approach. We received a verbal TCAS traffic advisory. At the same time ATC called out the traffic. I picked up the traffic visually and pointed it out to the Captain. He was trying to coordinate with ATC; but a lot of things happened real fast. ATC was trying to tell us the traffic was no factor. I noticed the traffic was turning directly at us. It was only 500 feet below us. The traffic then started to climb into us. As the traffic disappeared out the bottom of the Captain's side window. TCAS gave us a 'climb; climb now'. We executed the maneuver; which included a couple VS adjustments. During the maneuver; the Captain attempted to coordinate with ATC; but they again said the traffic was no factor. Once we received a 'clear of conflict' we were still in a position to execute a visual approach and land.Several other aircraft made comments to Tower about having the same issue.
A319 flight crew reported responding to an RA on approach to PIT even though ATC maintained the traffic was not a factor.