EMB ERJ 190/195 ER/LR
Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Conflict Airborne Conflict
Flight Crew Took Evasive Action
Human Factors; Procedure
We were on the ILS 4R approach to BOS in good VMC conditions. The approach controller on frequency 126.5 reported traffic to our left that had us in sight and was landing on runway 4L. Although we saw a target on the TCAS to our left and below us; we were not able to locate the aircraft visually. Approach control switched us to the tower on frequency 132.22. Shortly thereafter; at approximately 3500 feet MSL; we received a TCAS Traffic Advisory (TA); then an Resolution Advisory (RA); but were still not able to see the aircraft. I initiated a climb in response to the RA and the captain reported the RA to the tower. When clear of conflict; I returned to the glideslope and a stabilized approach and continued to a landing. We never did see the aircraft.An aircraft on a visual approach to runway 4L apparently strayed into the approach corridor for runway 4R. The aircraft either did not have us in sight or did a poor job of maintaining visual separation.Approach control could possibly stagger the arrivals to the parallel runways to provide better separation even though visual separation is already in use.
We were on the ILS 4R and advised of traffic though never saw him. While descending through 3500 FT we received a RA/Climb command we executed a climb and never saw traffic. We advised ATC; climbed about 200 FT; were 'clear of conflict' and able to re-stabilize on approach and landed without incident on 4R in Boston.I don't think the other aircraft actually ever had us in sight even though he called it. Our TCAS showed he was directly below us and not off to the left which is where he should've been.Unfortunately we can't do anything if someone reports 'traffic in sight' and may not actually see us; we did as TCAS commanded and everything turned out fine.
ERJ-190 flight crew reported getting an RA caused by an aircraft on a visual approach on the parallel runway into BOS.