Light Transport; Low Wing; 2 Turbojet Eng
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 22.0
Situational Awareness; Communication Breakdown; Human-Machine Interface
ATC Issue All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance
ATC Equipment / Nav Facility / Buildings; Human Factors; Procedure; Airspace Structure
Nassau Approach was busy. There is currently limited radar coverage in this area due to radar equipment not working. I was the R61-R44 controller. We were having difficulty getting the Nassau controllers to accept inbounds and they were slow in accepting handoffs. Aircraft X was over HANKX level at 13000 feet. The handoff was made and the aircraft communication transferred to Nassau frequency 125.3. The aircraft was landing Nassau.Aircraft Y reported on my frequency level 12000 feet joining G437. Aircraft X was on top of Aircraft Y and I called traffic and told Aircraft Y to maintain 12000 feet. The Assist was on the landline with Nassau and advising them to not descend Aircraft X until the aircraft passed. Aircraft X was observed descending and Aircraft Y reported a RA advisory and said they were responding to a RA. Aircraft Y climbed. After the two aircraft were no longer a factor I Climbed Aircraft Y to 23000 feet and cleared them direct Elbow.The Nassau Approach Radar has not been working for a while. Aircraft generally depart MYNN and we observe the aircraft on the radar leaving 8000 feet in their climb to 10000 feet.Because of the limited radar service in the area we are unable to see how busy the Nassau controllers are. The lack of radar has increased the complexity of their sectors.
A Center controller reported that the non-radar Approach Control facility descended an aircraft that the Center controller had restricted 1000 feet below it.