AN LGT ACR CREW HAD A FALSE TCASII ALERT AT THE SAME TIME THAT THEIR CLRNC WAS BEING CHANGED TO A DEP THAT WAS NOT IN THEIR FMC DATA BASE.

Narrative

DEPARTING LAX; RWY 25R; CLRED FOR LOOP 9. AFTER TKOF; DEP CTL TURNED US TO HDG 160 DEGS WHICH IS NOT THE NORMAL LOOP 9 HDG. A FEW MINS LATER; HE TOLD US THAT WE WERE ON THE LAXX 1 DEP AND WOULD BE TURNING TO SLI SOON. WHEN TURNED TO SLI; WE WERE CLRED TO 'SEAL BEACH AND THE DAGGETT TRANSITION.' SINCE THE LAXX 1 IS NOT IN THE FMC DATA BASE; AND SINCE WE WERE VERY CLOSE TO SLI; I ENTERED SLI; DIRECT DAG. AT THE SAME TIME; WE SWITCHED THE TCASII FROM TA TO TA/RA AND GOT AN IMMEDIATE FULL DOWN RA WHICH WAS OBVIOUSLY A 'GLITCH;' BUT WHICH WAS STILL DISTRACTING. AFTER PASSING SLI; THE CTLR ASKED US WHERE WE WERE GOING; AND WE; OF COURSE; REALIZED THAT SOMETHING WAS AMISS. WE CHKED THE LAXX 1 DEP PAGE AND DISCOVERED THE 'DOG LEG' BTWN SLI AND DAG. THE CTLR SEEMED TO BE UNCONCERNED; AND CLRED US DIRECT TO LAS. THIS WAS A TYPICAL 'COMBINATION OF INGREDIENTS' ERROR WHICH IS WHAT LEADS TO ACCIDENTS. SUPPLEMENTAL INFO FROM ACN 217471: THIS WAS A TYPICAL EXAMPLE OF MULTIPLE INPUTS IN A SHORT TIME. HAVING THE LAXX 1 DEP IN THE DATA BASE WOULD HAVE BEEN A BIG HELP IN AVOIDING THIS SITUATION. TCASII FALSE RA WAS A MAJOR DISTR TO NORMAL OPS IN THIS CASE POINTING OUT THE IMPORTANCE OF WORKING OUT ALL 'BUGS' IN THIS SYS.