Narrative:

I was working the local 2 position; which entails working runway 31L off-loaded departures and cba (VFR/helicopter operation in the B). Local 1 is working runway 4R/left. Aircraft X appears to be vectoring in for runway 4L and checks in on my frequency; which is the wrong frequency as he should be with local 1. I switch him to that frequency. He then appears to be disoriented and is overshooting the finals. He's now in conflict with aircraft Y; an arrival for runway 4R. Neither of them appear to be local 1 or the approach controller. I double check on my frequency and they aren't on mine either. They finally come up on local 1 and the controller separates them both.I recommend that the approach controller ensures that aircraft are either established on course and are no longer a factor with other aircraft before switching frequencies because sometimes they go to the wrong frequencies or lose communication and can become a problem; so much so that it can create an accident.

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Original NASA ASRS Text

Title: JFK Tower Controller reported an aircraft was using the incorrect frequency during handoff; which resulted in a conflict with another aircraft.

Narrative: I was working the Local 2 position; which entails working Runway 31L off-loaded departures and CBA (VFR/Helicopter Operation in the B). Local 1 is working Runway 4R/L. Aircraft X appears to be vectoring in for Runway 4L and checks in on my frequency; which is the wrong frequency as he should be with Local 1. I switch him to that frequency. He then appears to be disoriented and is overshooting the finals. He's now in conflict with Aircraft Y; an arrival for Runway 4R. Neither of them appear to be Local 1 or the Approach Controller. I double check on my frequency and they aren't on mine either. They finally come up on Local 1 and the Controller separates them both.I recommend that the Approach Controller ensures that aircraft are either established on course and are no longer a factor with other aircraft before switching frequencies because sometimes they go to the wrong frequencies or lose communication and can become a problem; so much so that it can create an accident.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.