Descending carj causes a TCASII maneuver with lower B712, who descends into conflict with lower MD80...

Attributes
ACN	567717
Time
Date	200212
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : vxv.vortac
State Reference	TN
Altitude	msl bound lower : 24700 msl bound upper : 26500
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : ztl.artcc
Operator	common carrier : air carrier
Make Model Name	B717
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute airway : j91.airway
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : ztl.artcc tracon : mem.tracon
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 : level
Route In Use	enroute airway : j91.airway
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller limited radar : 19.5 controller non radar : 20 controller radar : 17.5 controller time certified in position1 : 19
ASRS Report	567717
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	atc equipment : conflict alert aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	controller : issued advisory flight crew : took evasive action
Miss Distance	horizontal : 12000 vertical : 700
Supplementary
Problem Areas	Flight Crew Human Performance Environmental Factor ATC Human Performance Aircraft
Primary Problem	Environmental Factor

Narrative:

Aircraft #3 was a T/CRJ2/F, air carrier, passenger, IFR, in descent, controled. Aircraft #1 and #2 were nebound on J91. Aircraft #2 was approximately 2 mi in trail and overtaking aircraft #1 by approximately 50 KTS. Aircraft #3 was sebound descending to FL260. When aircraft #3 descended through FL265, he advised he was responding to a TCASII RA and climbing. At this point aircraft #3 was approximately 3 mi east of aircraft #1 and diverging rapidly. Aircraft #1 also responded to a TCASII RA and descended into aircraft #2, causing a loss of separation. Aircraft #1 had been advised of aircraft #3 and that aircraft #3 was going to level at FL260.

Original NASA ASRS Text

Title: DSNDING CARJ CAUSES A TCASII MANEUVER WITH LOWER B712, WHO DSNDS INTO CONFLICT WITH LOWER MD80 IN ZTL AIRSPACE.

Narrative: ACFT #3 WAS A T/CRJ2/F, ACR, PAX, IFR, IN DSCNT, CTLED. ACFT #1 AND #2 WERE NEBOUND ON J91. ACFT #2 WAS APPROX 2 MI IN TRAIL AND OVERTAKING ACFT #1 BY APPROX 50 KTS. ACFT #3 WAS SEBOUND DSNDING TO FL260. WHEN ACFT #3 DSNDED THROUGH FL265, HE ADVISED HE WAS RESPONDING TO A TCASII RA AND CLBING. AT THIS POINT ACFT #3 WAS APPROX 3 MI E OF ACFT #1 AND DIVERGING RAPIDLY. ACFT #1 ALSO RESPONDED TO A TCASII RA AND DSNDED INTO ACFT #2, CAUSING A LOSS OF SEPARATION. ACFT #1 HAD BEEN ADVISED OF ACFT #3 AND THAT ACFT #3 WAS GOING TO LEVEL AT FL260.

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.

Descending carj causes a TCASII maneuver with lower B712, who descends into conflict with lower MD80 in ZTL airspace.