Center controllers and an air taxi flight crew reported the aircraft responded to an RA while being ...

Attributes
ACN	1538007
Time
Date	201804
Local Time Of Day	0601-1200
Place
Locale Reference	ZMA.ARTCC
State Reference	FL
Environment
Light	Daylight
Aircraft 1
Make Model Name	Falcon 2000
Operating Under FAR Part	Part 135
Flight Phase	Descent
Flight Plan	IFR
Aircraft 2
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Enroute
Qualification	Air Traffic Control Fully Certified
Person 2
Function	Enroute
Qualification	Air Traffic Control Developmental
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance

Narrative:

Aircraft X was given a descent clearance out of 40000 feet to 38000 feet. Aircraft X read back the descent clearance to 38000 feet correctly. The radar team then noticed that was descending out of 37700 feet to an unknown altitude head on with aircraft Y northbound level at 37000 feet. The radar controller issued aircraft X an expedited turn to the right and aircraft Y and expedited turn to the right as well. The radar controller then issued an expedited descent clearance to 34000 feet for aircraft X. Aircraft Y then declared an RA and began to climb. Aircraft X also declared an RA and descended. Once both aircraft were clear from the problem the radar controller cleared both aircraft back on course.

Original NASA ASRS Text

Title: Center Controllers and an air taxi flight crew reported the aircraft responded to an RA while being vectored and descended for opposite direction traffic at the same altitude.

Narrative: Aircraft X was given a descent clearance out of 40000 feet to 38000 feet. Aircraft X read back the descent clearance to 38000 feet correctly. The radar team then noticed that was descending out of 37700 feet to an unknown altitude head on with Aircraft Y northbound level at 37000 feet. The Radar Controller issued Aircraft X an expedited turn to the right and Aircraft Y and expedited turn to the right as well. The Radar Controller then issued an expedited descent clearance to 34000 feet for Aircraft X. Aircraft Y then declared an RA and began to climb. Aircraft X also declared an RA and descended. Once both aircraft were clear from the problem the Radar Controller cleared both aircraft back on course.

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.

Center controllers and an air taxi flight crew reported the aircraft responded to an RA while being vectored and descended for opposite direction traffic at the same altitude.