LESS THAN STANDARD SEPARATION BETWEEN ACR MLG DESCENDING AND A FLT OF 2 MLT'S CLIMBING.

1988-03 · NASA ASRS report 90294

Date: 1988-03 · Aircraft: Medium Large Transport

Anomalies: atc-issue-all-types|conflict-airborne-conflict

Synopsis

LESS THAN STANDARD SEPARATION BETWEEN ACR MLG DESCENDING AND A FLT OF 2 MLT'S CLIMBING.

Narrative

AT SECTOR 11; I OBSERVED 2 TRACKED TARGETS. ONE WAS MLG X INBND FROM THE S OVER PXN V301 DSNDING FOR OAK. THE OTHER WAS A FLT OF 2 MLT'S Y WBOUND OVER THE PXN (PANOCHE) VOR AT FL220 B230. MLG X WAS DSNDING THRU FL240 JUST N OF PXN WHEN STANDARD CENTER SEP WAS LOST VERTICAL 500'; LATERAL APPROX 3 MI. A 'J CIRCLE' THAT DENOTES 5 MI LATERAL SEP SURROUNDED THE MIL FLT AT FL229 AND MLG X LEAVING FL234 WAS CLRLY WITHIN THE CIRCLE. THE CONFLICT ALERT FOR REASONS UNKNOWN TO ME; BUT WHAT I BELIEVE TO BE A PROGRAMMING LIMITATION; DID NOT ACTIVATE; WHICH IN TURN DID NOT ACTIVATE THE 'EDP' PROCESSING. THIS ERROR WAS ALSO OBSERVED BY AN AREA SUPVR; AND RPTED TO THE AREA MGR. I WAS TOLD NO OP ERROR INVESTIGATION WOULD TAKE PLACE BECAUSE THE 'SNITCH' WAS NOT ACTIVATED. THIS ERROR OCCURRED BECAUSE THE MIL DATA BLOCK WAS NOT PRESENT ON THE SEC 11 SCOPE; ALTHOUGH IT WAS WITHIN THE CONFINES OF THE SEC 11 AIRSPACE. A COORD MIXUP BTWN SEC 11 AND SEC 18 CAUSED THIS ERROR. DUE TO PRESSURE TO KEEP OP ERRORS DOWN (ZOA HAS HAD SEVERAL ALREADY IN 1988); APPARENTLY THE DATA (NTAP; ETC.) IS NOT BEING EXAMINED AND WILL PROBABLY NOT BE SAVED BY THE TIME YOU GET THIS RPT. AS LONG AS INCIDENT RPTING IS PUNITIVE; THIS TYPE OCCURRENCE WILL PROBABLY CONTINUE. AS A RESULT POSITIVE STEPS TO PREVENT A SIMILAR TYPE OCCURRENCE WILL NOT BE EXAMINED OR MADE AVAILABLE TO ALL CTLRS.

Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.

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