MD88 crew and an rj had a supposed less than legal separation in ZTL class a when receiving a false warning on their TCASII with descending opposite direction traffic.

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Attributes
ACN	597026
Time
Date	200310
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : odf.vortac
State Reference	GA
Altitude	msl single value : 28000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl.artcc
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Navigation In Use	other other vortac
Flight Phase	cruise : enroute altitude change cruise : level
Route In Use	enroute airway : j145.airway
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : ztl.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 : enroute altitude change cruise : level
Route In Use	enroute airway : j145.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 5700 flight time type : 1800
ASRS Report	597026
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument pilot : multi engine pilot : private
Experience	flight time last 90 days : 150 flight time total : 6000 flight time type : 2400
ASRS Report	596080
Events
Anomaly	conflict : airborne critical non adherence : published procedure non adherence : required legal separation non adherence : far other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action other
Miss Distance	vertical : 1000
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance Aircraft
Primary Problem	Ambiguous

Narrative:

We were in cruise flight along J145 en route from pit to atl. At XA57 local, we were cruising at FL280 in IMC. We were 40-45 mins north on J145 when we received a TA. We noted other aircraft was descending rapidly and appeared to be heading right for us. We received an RA commanding a descent at 2000 FPM. Having not received a callout from ATC and lacking visual contact, I initiated a manual descent. RA continued to FL263. We leveled off at FL260. ATC further descended us to FL240. Air carrier Y rj said he too received an RA requiring him to level off. Supplemental information from acn 596080: controller said he was on UHF frequency with a military aircraft and apologized for not advising of descending aircraft. Descending aircraft idented himself by call sign and type (rj) and stated they had received RA as well and that they had an aggressive descent rate.

Original NASA ASRS Text

Title: MD88 CREW AND AN RJ HAD A SUPPOSED LESS THAN LEGAL SEPARATION IN ZTL CLASS A WHEN RECEIVING A FALSE WARNING ON THEIR TCASII WITH DSNDING OPPOSITE DIRECTION TFC.

Narrative: WE WERE IN CRUISE FLT ALONG J145 ENRTE FROM PIT TO ATL. AT XA57 LCL, WE WERE CRUISING AT FL280 IN IMC. WE WERE 40-45 MINS N ON J145 WHEN WE RECEIVED A TA. WE NOTED OTHER ACFT WAS DSNDING RAPIDLY AND APPEARED TO BE HEADING RIGHT FOR US. WE RECEIVED AN RA COMMANDING A DSCNT AT 2000 FPM. HAVING NOT RECEIVED A CALLOUT FROM ATC AND LACKING VISUAL CONTACT, I INITIATED A MANUAL DSCNT. RA CONTINUED TO FL263. WE LEVELED OFF AT FL260. ATC FURTHER DSNDED US TO FL240. ACR Y RJ SAID HE TOO RECEIVED AN RA REQUIRING HIM TO LEVEL OFF. SUPPLEMENTAL INFO FROM ACN 596080: CTLR SAID HE WAS ON UHF FREQ WITH A MIL ACFT AND APOLOGIZED FOR NOT ADVISING OF DSNDING ACFT. DSNDING ACFT IDENTED HIMSELF BY CALL SIGN AND TYPE (RJ) AND STATED THEY HAD RECEIVED RA AS WELL AND THAT THEY HAD AN AGGRESSIVE DSCNT RATE.

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.