Date: 201812
Local time of day: 0601-1200
Location: ZZZ.TRACON, US
Aircraft: A319
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Final Approach
Airspace: Class B ZZZ
ATC / advisory: TRACON ZZZ
Second aircraft: B737 Undifferentiated or Other Model
Reporter organization: Government
Reporter function: Approach
Reporter qualification: Air Traffic Control Fully Certified
Human factors: Communication Breakdown; Situational Awareness
Anomaly: ATC Issue All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Air Traffic Control
When detected: In-flight
Result: Air Traffic Control Issued New Clearance
Contributing factors: Human Factors
Primary problem: Human Factors

Narrative: I was working Arrivals/Finals. ZZZ Tower called on the land line. I heard them ask 'Do you want to go north?' Tower will occasionally change configurations during the mid-shift; and I rarely question the motives or reasons. I responded 'Let's go north'. I then input the command into the STARS keyboard to change the room configuration so the data tags would indicate the correct runways. I then called all the affected center sectors to inform them of the new landing configuration. Several minutes later; Aircraft X and Aircraft Y entered my airspace from the southeast. I informed them to expect approaches to Runway XXL; and that an updated ATIS should be coming out shortly to indicate the correct runways. I then vectored both aircraft towards the XXL final. When Aircraft X was 20 miles south of the airport; he asked for an ILS approach; so I issued a clearance. 12 miles south of the airport; Aircraft X asked if the localizer was up. At that point; I asked the Departure Controller to look at the ILS localizer status indicator to see if it was indicating the correct runways; as he had a better view of the screen. He informed me the localizers were still on the south runways. I called Local and asked 'Will you turn on the localizer for XXL?' [Controller] responder 'Yes'. At 8 mile final I again asked the [Departure] Controller if the XXL localizer had been switched over; and he said that it hadn't. I began to issue a visual approach clearance to Aircraft X; but mid transmission I was interrupted by the Departure Controller. He had walked over to the Traffic Management Unit (TMU) desk and glanced at the runway/taxiway monitor and saw that [Tower] was launching an aircraft off Runway XYR. He told me 'Get him out of there; they're launching!' I quickly canceled both approach clearances (I had issued a visual approach clearance to Aircraft Y prior). Tower called and said she was vectoring the departure and stopping them at 7;000; and then asked why I was coming into XXL. I told her it was because I had been called 15 minutes prior to 'Go north'. As soon as I saw Aircraft Z's data block appear on my scope; I issued a traffic call and applied visual separation as soon as possible. I then proceeded to issue runway changes to both aircraft and vector them to the XYL final. After I was relieved from position; I went to a computer where I could view a replay and listen to the audio. Although the coordination was somewhat scratchy; it did sound like the tower controller had said 'Do you want to go noise?' Proper phraseology would have gone a long way to prevent this misunderstanding. Typically I will hear 'Go into noise' or something similar.




Synopsis: Arrival Controller reported a communication problem with Tower Controller that led to an unsafe operation.