SAN ANTONIO, TX, USA
N728
BOEING 727-200A
XAMXE
BOEING 727-200
AMERICAN AIRLINE FLT 1269 & MEXICANA AIRLINE FLT 731 WERE CRUISING AT FL 290 ON SOUTHERLY HEADINGS. AFTER DEVIATING AROUND WEATHER, FLT 1269 WAS ON A SOUTH-SOUTHEASTERLY HEADING. SUBSEQUENTLY, THE TWO BOEING 727 AIRCRAFT CONVERGED TO ABOUT 1.06 MI FROM EACH OTHER, VIOLATING THE MINIMUM HORIZONTAL SEPARATION REQUIREMENT. THE OPERATIONAL ERROR OCCURRED WHEN THE ARTCC CONTROLLER WAS BUSY WITH HEAVY TRAFFIC.
FAILURE OF THE ARTCC CONTROLLER TO ASSURE THAT THE AIRCRAFT MAINTAINED IFR SEPARATION STANDARDS. THE CONTROLLER'S HEAVY WORKLOAD WAS A RELATED FACTOR.
Source: NTSB Aviation Accident Database
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