Date: 201705
Local time of day: 1201-1800
Location: ZNY.ARTCC, NY
Light: Daylight
Aircraft: Light Transport; Low Wing; 2 Turboprop Eng
Operator: Corporate
Operating under: Part 91
Flight plan: IFR
Mission: Passenger
Flight phase: Climb
Airspace: Class A ZNY
ATC / advisory: Center ZNY
Second aircraft: Medium Large Transport; Low Wing; 2 Turbojet Eng
Reporter organization: Government
Reporter function: Enroute
Reporter qualification: Air Traffic Control Fully Certified
Human factors: Situational Awareness; Distraction; Communication Breakdown; Training / Qualification
Second reporter function: Enroute
Anomaly: ATC Issue All Types; Conflict Airborne Conflict; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Detector: Automation Aircraft RA; Person Air Traffic Control
When detected: In-flight
Result: Air Traffic Control Issued New Clearance; Air Traffic Control Separated Traffic; Flight Crew FLC complied w / Automation / Advisory; Flight Crew Took Evasive Action
Contributing factors: Human Factors; Airspace Structure; ATC Equipment / Nav Facility / Buildings; Procedure
Primary problem: ATC Equipment / Nav Facility / Buildings

Narrative: Sector 75 had lost their frequency. They had several aircraft that were higher than normal due to the fact that they were not talking to them. Aircraft Y being worked by sector 75 was level at 33000 feet. This was a LGA lander. I was working Aircraft X on J60. He was level at 23000 feet. His path would have taken him directly underneath Aircraft Y who I thought was going to descend shortly. I had my Radar Assist controller point out that aircraft to Sector 75 and I turned Aircraft X to a 300 heading and climbed Aircraft X. This would have kept Aircraft X clear from Aircraft Y. Due to miscommunication; the Radar Controller at 75 did not know I was doing this. Once I noticed that we would lose separation I acted accordingly to re-establish separation as quickly as possible.


Second narrative: Sector 75 lost all frequencies for a period of time. Back-up frequencies were unavailable. Sector traffic that needed to be descended were high. Aircraft went to different frequencies then came back when we received new frequency. Aircraft Y was flying the MIP4 arrival to NY LGA. We regained communications with Aircraft Y and descended the aircraft. A point out was made to ZNY Sec 39 as the aircraft would be high going into the next fix. ZNY Sector 39 issued traffic to the Sector 75 Assist; Aircraft X climbing out of 22;000 for 36000 feet. Aircraft Y was issued an altitude and turned to the left to be descended and re-sequenced. HOWEVER; ZNY Sector 39 turned Aircraft X to a westbound heading into my airspace. THIS INFORMATION WAS NEVER COORDINATED WITH ME. Aircraft X continued westbound into Aircraft Y. The Assist Controller was told to have the Aircraft X stop at 26000 feet; and Aircraft Y was ordered to stop at 27000 feet. Aircraft X NEVER STOPPED ITS CLIMB AND CLIMBED INTO Aircraft Y. TCAS alerted Aircraft Y to climb. Separation was re-established.


Synopsis: ZNY Center controllers reported turning two aircraft; one climbing and one descending; into confliction due to incomplete coordination.