Narrative:

Approximately 60 mins after assuming the radar position at sector (26 lrp) I observed 2 aircraft, both level at 9000', on converging courses. 1 was northbound, the other eastbound. In an effort to maintain sep, the eastbound aircraft was turned to a northerly heading and the northbound aircraft, following coordination with an adjacent facility, was descended to 8000'. However, minimum sep was lost shortly thereafter. Although controllers are trained not to rely on the ca feature, it should be pointed out that the ca indicator did not activate until well after sep had been lost.

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Original NASA ASRS Text

Title: ACTION BY CTLR TO SEPARATE 2 ACFT AT SAME ALT ON CONVERGING COURSES WAS NOT IN SUFFICIENT TIME TO PREVENT LOSS OF SEPARATION.

Narrative: APPROX 60 MINS AFTER ASSUMING THE RADAR POS AT SECTOR (26 LRP) I OBSERVED 2 ACFT, BOTH LEVEL AT 9000', ON CONVERGING COURSES. 1 WAS NBND, THE OTHER EBND. IN AN EFFORT TO MAINTAIN SEP, THE EBND ACFT WAS TURNED TO A NORTHERLY HDG AND THE NBOUND ACFT, FOLLOWING COORD WITH AN ADJACENT FAC, WAS DSNDED TO 8000'. HOWEVER, MINIMUM SEP WAS LOST SHORTLY THEREAFTER. ALTHOUGH CTLRS ARE TRAINED NOT TO RELY ON THE CA FEATURE, IT SHOULD BE POINTED OUT THAT THE CA INDICATOR DID NOT ACTIVATE UNTIL WELL AFTER SEP HAD BEEN LOST.

Data retrieved from NASA's ASRS site as of August 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.