CL65 experienced TCASII TA RA and loss of separation with an MD80 at FL310 in ZJX airspace.

Attributes
ACN	593476
Time
Date	200309
Day	Thu
Place
State Reference	FL
Altitude	msl bound lower : 29000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zjx.artcc
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : atp
Experience	flight time last 90 days : 210 flight time total : 4700 flight time type : 2074
ASRS Report	593476
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 700
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

At FL310, received TA 'traffic' aural warning. ATC called for immediate left descending turn. Simultaneously received RA for descent of +4000 FPM. Captain (PF) complied with both. Leveled at FL290 as instructed by ATC. Neither I nor captain saw the other aircraft. After being instructed to return to FL310, we queried ATC about situation. ATC said an MD80 descending slower than expected.

Original NASA ASRS Text

Title: CL65 EXPERIENCED TCASII TA RA AND LOSS OF SEPARATION WITH AN MD80 AT FL310 IN ZJX AIRSPACE.

Narrative: AT FL310, RECEIVED TA 'TFC' AURAL WARNING. ATC CALLED FOR IMMEDIATE L DSNDING TURN. SIMULTANEOUSLY RECEIVED RA FOR DSCNT OF +4000 FPM. CAPT (PF) COMPLIED WITH BOTH. LEVELED AT FL290 AS INSTRUCTED BY ATC. NEITHER I NOR CAPT SAW THE OTHER ACFT. AFTER BEING INSTRUCTED TO RETURN TO FL310, WE QUERIED ATC ABOUT SIT. ATC SAID AN MD80 DSNDING SLOWER THAN EXPECTED.

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.