Narrative:

King air direct pmd out of FL210 climbing to FL230. Aircraft Y hec mitts 2 arrival to lax. I descended aircraft Y to FL190. Conflict alert activated. I stopped aircraft X at FL220 and aircraft Y at FL230. Aircraft Y descended to FL225 before climbing back to FL230. I was distraction by an aircraft responding to an RA 2 mins before.

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Original NASA ASRS Text

Title: ZLA CTLR EXPERIENCED OPERROR AT FL230 AS DSNDING LAX ARR CONFLICTED WITH CLBING BE350.

Narrative: KING AIR DIRECT PMD OUT OF FL210 CLBING TO FL230. ACFT Y HEC MITTS 2 ARR TO LAX. I DSNDED ACFT Y TO FL190. CONFLICT ALERT ACTIVATED. I STOPPED ACFT X AT FL220 AND ACFT Y AT FL230. ACFT Y DSNDED TO FL225 BEFORE CLBING BACK TO FL230. I WAS DISTR BY AN ACFT RESPONDING TO AN RA 2 MINS BEFORE.

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.