A ZNY ARTCC controller descended an aircraft through the altitude of opposite direction traffic.

Attributes
ACN	1467286
Time
Date	201707
Local Time Of Day	1201-1800
Place
Locale Reference	ZNY.ARTCC
State Reference	NY
Environment
Light	Daylight
Aircraft 1
Make Model Name	PC-12
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Learjet 60
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Enroute
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 10
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy

Narrative:

There was training on the handoff position and the trainee was a little behind causing data blocks to overlap and handoffs were slow which caused the sector to be more chaotic than normal. I descended aircraft X from 16;000 feet to 10;000 feet with aircraft Y at 13;000 feet opposite direction. I turned aircraft X from a 250 heading to a 310 heading after I realized aircraft X wasn't descending according to aircraft specifications. I issued traffic to aircraft Y. When he reported traffic in sight; I told him to maintain visual separation. Aircraft Y replied and advised me he received an RA. I gave traffic to aircraft X that aircraft Y had him in sight and is maintaining visual separation.I should have used vertical separation.

Original NASA ASRS Text

Title: A ZNY ARTCC Controller descended an aircraft through the altitude of opposite direction traffic.

Narrative: There was training on the Handoff position and the trainee was a little behind causing data blocks to overlap and handoffs were slow which caused the sector to be more chaotic than normal. I descended Aircraft X from 16;000 feet to 10;000 feet with Aircraft Y at 13;000 feet opposite direction. I turned Aircraft X from a 250 heading to a 310 heading after I realized Aircraft X wasn't descending according to aircraft specifications. I issued traffic to Aircraft Y. When he reported traffic in sight; I told him to maintain visual separation. Aircraft Y replied and advised me he received an RA. I gave traffic to Aircraft X that Aircraft Y had him in sight and is maintaining visual separation.I should have used vertical separation.

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.