FLT PLAN HANDLING PROC PROVIDES FLC WITH AN IMPROPER FLT PLAN FOR RTE.

Narrative

I AM AN ACFT DISPATCHER FOR A MAJOR AIRLINE. ON MAR/MON/93; I WAS DOING SOME RESEARCH ON NEW RTES FROM SANTIAGO CHILE TO MIAMI USA. THIS INFO HAS BEEN REQUESTED BY SEVERAL CAPTS OPERATING THESE RTES. THE MAJOR PROBS WITH THESE RTES ARE DRIFTDOWN SINGLE ENG PERFORMANCE OVER THE ANDES MOUNTAINS. I WAS WORKING ON A NEW RTE WHICH WOULD SHORTEN THE FLT BY 150 MI AND 2000 LBS OF FUEL. I INPUT THE INFO INTO MY WORK (MAIN) COMPUTER TO COMPARE DATA. I USED THE WTS AND FUEL DATA ON TODAY'S FLT SCL- MIA. THE FIRST MAJOR PROB WAS I DIDN'T DELETE THE NEW SHORTER RTE FROM MY COMPUTER. WHEN THE FLT PLAN CALCULATED FOR FLT XX; IT PICKED THE NEW UNANALYZED RTE. THE SECOND MISTAKE WAS I DIDN'T FULLY CHK THE FLT PLAN. I CHKED THE FUEL; MEL ITEMS; ALTS; AND JUST A SMALL PORTION OF THE FLT RTE; NOT THE FULL AND COMPLETE RTE. THE FLC DIDN'T CATCH THE MISTAKE ALSO IN THEIR PREFLT PREPARATIONS. IT WAS NOT UNTIL AFTER THE FLT DEPARTED SANTIAGO DID THE FLC CONTACTED THE DISPATCHER AND ADVISE ME OF THE MISTAKE. A NEW FLT PLAN WAS SENT AND INPUT INTO THE COMPUTER. A MANUAL DRIFTDOWN DATA SHOWED THAT THE FLT WOULD HAVE NO PROB OVER THE ANDES MOUNTAINS; BUT WE ARE NOT ALLOWED TO USE NEW RTES UNTIL THEY ARE ANALYZED BY OPS. MYSELF AS WELL AS THE 3 FLC MEMBERS WERE A LITTLE TOO SELF-ASSURED REF OUR ROUTINE PROCS. JUST A SMALL AMOUNT OF ADDED TIME TO REVIEW THE FLT PLAN IN LENGTH WOULD HAVE ALLEVIATED THIS MISCALCULATION.