Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 17.8
Confusion; Situational Awareness
ATC Issue All Types; Inflight Event / Encounter Other / Unknown
Air Traffic Control Issued New Clearance; Flight Crew Executed Go Around / Missed Approach; General Flight Cancelled / Delayed
Airspace Structure; Company Policy; Procedure
Aircraft X and Aircraft Y were paired almost exactly side by side for the right and left runways. There was a heavy B777 that had preceded both to the left runway; with a southwest wind. Aircraft X announced they were 'on the go.' I gave standard missed approach instructions; heading 280 and 3;000 feet. Once they had read back and were climbing; I inquired if it was for a TCAS RA for the parallel traffic; since it could have easily been for wake turbulence. They keyed up with some sort of mechanical voice I am not familiar with in the background and said yes; it was a TCAS RA.After coordinating with TRACON for the go around; I resumed working traffic. I eventually called over to the ramp where company of Aircraft Y parks and asked the Ramp Controller to confirm a coordinated TCAS occurred with Aircraft Y. Aircraft Y pilot said they did not have an RA. I guess if one (below) is in TA mode; the one on top could still get the RA and climb. I do not have a suggestion; as I am not certain myself or any other controller fully understands how the TCAS beast exists in our National Airspace System (NAS).
A Tower Controller reported an aircraft initiated a go-around due to a TCAS/RA it received for parallel runway traffic that it had in sight.