Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 3.5
Situational Awareness; Time Pressure; Troubleshooting; Communication Breakdown; Confusion; Distraction
Conflict Airborne Conflict; Deviation - Speed All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Provided Assistance
Human Factors; Procedure; Aircraft
I was working local control with the radar controller switched Aircraft X to me on a visual approach.  I cleared Aircraft X to land runway 4r.  I continued to scan the d-brite and noticed that the radar controller had turn Aircraft Y onto the ILS final and with speeds compression was occurring rapidly and to avoid a tie to the runway threshold I cancelled Aircraft X's landing clearance and turn him to the south heading 180 and then called the traffic that he was going to have to follow to the airport and he reported the traffic in sight so I instructed Aircraft X to follow the traffic and issued the visual approach clearance.
Aircraft X inbound from the northwest for runway 4R and Aircraft Y from the southwest for 4R.  ILS approaches are in use.  Aircraft X was inbound from the NW and requested a Visual approach several times and was instructed that I could not vector him for a visual because the bases were too low; but if he got the field in sight at any point being vectored for the ILS; to report it in sight.  He got the airport in sight 10 east of the field and was instructed to keep his base in tight for sequence.Aircraft X was cleared for a visual approach.  I turned Aircraft Y from a 110 heading base leg 18 SW of the field to a 160 to build some spacing.  When I turned Aircraft Y on to final and was cleared and established for an ILS and instructed to maintain 180 kt till the final approach fix.  Aircraft X did not turn his base to a final; instead extending his base leg while Aircraft Y was tracking inbound from the final approach fix. The Local controller had both in sight and made the decision that Aircraft X wasn't going to turn in final and land with the required spacing in front of Aircraft Y and canceled his approach clearance; turned him left to a 180 heading.  Aircraft X got Aircraft Y in sight and followed him to the runway in sequence.  When Aircraft X was tracking outbound on the 180 heading; 3mi separation appeared to not exist.I should have either taken Aircraft Y across final for spacing or not made Aircraft X #1 in front of Aircraft Y.
LFT Approach and Tower controllers report of an overtake on final due to speed and turns.