ZTL controller has an operational error at approximately FL260 when instructor fails to hear a conflicting descent clearance issued by the developmental controller.

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Attributes
ACN	646134
Time
Date	200502
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : dbn.vortac
State Reference	GA
Altitude	msl bound lower : 26000 msl bound upper : 27000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl.artcc
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : ztl.artcc
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar instruction : instructor
Qualification	controller : radar
Experience	controller radar : 18
ASRS Report	646134
Person 2
Affiliation	government : faa
Function	controller : radar instruction : trainee
Qualification	controller : developmental
ASRS Report	646133
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert other controllera other controllerb other other : 3
Resolutory Action	controller : issued alert
Miss Distance	horizontal : 26400 vertical : 400
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was performing OJT. Air carrier X was descended to FL240. Air carrier Y was at FL260 opposite direction. Air carrier X was descending from FL410 and was not a factor. However; air carrier Z; who was 10 mi in trail of air carrier X; was at FL270 and was descended to FL240. I missed this clearance or thought it was air carrier X. Supplemental information from acn 646133: I was training on the radar position working overflts and arrs into atl. Air carrier Y was an overflt north to south; air carrier Z was an arrival to atl. Air carrier Y was at FL260; air carrier Z was at FL270. Air carrier Z was turned to husky then descended to FL240. Conflict alert did not activate until aircraft had passed.

Original NASA ASRS Text

Title: ZTL CTLR HAS AN OPERROR AT APPROX FL260 WHEN INSTRUCTOR FAILS TO HEAR A CONFLICTING DSCNT CLRNC ISSUED BY THE DEVELOPMENTAL CTLR.

Narrative: I WAS PERFORMING OJT. ACR X WAS DSNDED TO FL240. ACR Y WAS AT FL260 OPPOSITE DIRECTION. ACR X WAS DSNDING FROM FL410 AND WAS NOT A FACTOR. HOWEVER; ACR Z; WHO WAS 10 MI IN TRAIL OF ACR X; WAS AT FL270 AND WAS DSNDED TO FL240. I MISSED THIS CLRNC OR THOUGHT IT WAS ACR X. SUPPLEMENTAL INFO FROM ACN 646133: I WAS TRAINING ON THE RADAR POS WORKING OVERFLTS AND ARRS INTO ATL. ACR Y WAS AN OVERFLT N TO S; ACR Z WAS AN ARR TO ATL. ACR Y WAS AT FL260; ACR Z WAS AT FL270. ACR Z WAS TURNED TO HUSKY THEN DSNDED TO FL240. CONFLICT ALERT DID NOT ACTIVATE UNTIL ACFT HAD PASSED.

Data retrieved from NASA's ASRS site as of January 2009 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.