DC9 aircraft in descent had TCASII on another aircraft. ARTCC radar controller intervened and gave heading vectors to separate aircraft, but loss of separation had occurred.

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Attributes
ACN	398420
Time
Date	199804
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ujm
State Reference	AR
Altitude	msl bound lower : 24000 msl bound upper : 24000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zme
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	enroute : on vectors enroute airway : zme
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 15000 flight time type : 12000
ASRS Report	398420
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 15840 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

TCASII called for climb. Saw MD80 at our 1 O'clock, same altitude (TCASII indicated 3 or 4 mi and 200 ft below, climbing). At about the same time ATC gave us a turn to 090 degrees and MD80 a 270 degree heading. Not sure of MD80's flight regime. We were descending through FL240 to FL190 direct to ujm for arrival to mem. Maneuvers were not abrupt. I believe both aircraft were adhering to their respective clrncs and also that both aircraft responded to TCASII RA's prior to ATC's headings. The conflict was not close and required no abrupt maneuvers but did require deviation from clearance and was unusual (first I've experienced) as an RA in controled (FL240) airspace.

Original NASA ASRS Text

Title: DC9 ACFT IN DSCNT HAD TCASII ON ANOTHER ACFT. ARTCC RADAR CTLR INTERVENED AND GAVE HDG VECTORS TO SEPARATE ACFT, BUT LOSS OF SEPARATION HAD OCCURRED.

Narrative: TCASII CALLED FOR CLB. SAW MD80 AT OUR 1 O'CLOCK, SAME ALT (TCASII INDICATED 3 OR 4 MI AND 200 FT BELOW, CLBING). AT ABOUT THE SAME TIME ATC GAVE US A TURN TO 090 DEGS AND MD80 A 270 DEG HDG. NOT SURE OF MD80'S FLT REGIME. WE WERE DSNDING THROUGH FL240 TO FL190 DIRECT TO UJM FOR ARR TO MEM. MANEUVERS WERE NOT ABRUPT. I BELIEVE BOTH ACFT WERE ADHERING TO THEIR RESPECTIVE CLRNCS AND ALSO THAT BOTH ACFT RESPONDED TO TCASII RA'S PRIOR TO ATC'S HDGS. THE CONFLICT WAS NOT CLOSE AND REQUIRED NO ABRUPT MANEUVERS BUT DID REQUIRE DEV FROM CLRNC AND WAS UNUSUAL (FIRST I'VE EXPERIENCED) AS AN RA IN CTLED (FL240) AIRSPACE.

Data retrieved from NASA's ASRS site as of July 2007 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.