FLT CREW OF A319; TASK SATURATED BY AN UNEXPECTED SLAM DUNK TYPE OF VISUAL APCH; LWOC AT LAS.

Narrative

THIS WAS THE FINAL LEG OF A LONG DAY OF FLYING (JFK-LAX-LAS; APPROX 7 HRS 15 MINS OF BLOCK FLT TIME). WE WERE VECTORED OFF OF THE KEPEC 1 RNAV ARR; FOR A CLOSE APCH/VISUAL TO RWY 25L AT LAX. THE ACFT WAS HIGH ON THE APCH PROFILE; AND THE PF AND I FACED A HIGH WORKLOAD PERIOD -- CONFIGURING THE ACFT; MODIFYING THE LEVEL OF ACFT AUTOMATION (CLRING WAYPOINTS IN THE MCDU; CHANGING SETTINGS ON THE FCU/FLT DIRECTOR SETUP); RUNNING THE LNDG CHKLIST; MAKING PROPER ALT CALLOUTS; AND VISUALLY SCANNING FOR TFC. AS THE APCH PROGRESSED; THE CAPT AND I BECAME ENGROSSED IN A DISCUSSION ABOUT AN INCORRECT 'GND SPD MINI' CALCULATION ON OUR AIRSPD INDICATORS. (GND SPD MINI IS AN ENERGY MGMNT FEATURE USED BY A319/A320 ON FINAL APCH.) THE LNDG PROCEEDED NORMALLY; UNTIL I REALIZED DURING THE LNDG ROLLOUT THAT THE #1 RADIO HAD NOT BEEN SWITCHED TO THE TWR FREQ. WE MAY HAVE MADE OUR LNDG WITHOUT A CLRNC. WE SWITCHED IMMEDIATELY TO THE TWR FREQ AND CHKED IN WHILE ROLLING OUT AND CLRING THE RWY. WITHOUT FURTHER COMMENT; THE TWR CTLR ISSUED A TAXI CLRNC AND FREQ CHANGE TO RAMP CTL. THOUGH SURPRISED AT MY OVERSIGHT; I CAN HONESTLY SAY THERE WAS NO RECKLESS INTENT ON MY PART OR ON THE PART OF THE CAPT. IN MY OPINION; A PERIOD OF HIGH WORKLOAD; A MOMENTARY FIXATION/OMISSION WITH AN UNEXPECTED INDICATION ON FLT INSTS; AND A CERTAIN COMPONENT OF FATIGUE RESULTED IN NOT CHANGING RADIO FREQS IN A TIMELY MANNER. EVEN THE CAPT WAS UNAWARE OF WHAT HAD OCCURRED; CLAIMING HIS FOCUS WAS MORE ON ACFT FLT PATH/CTL AND MAKING A STABILIZED APCH. OUR OWN 'REMINDER' PROCS USED TO CONFIRM RECEIPT OF A LNDG CLRNC FAILED DUE TO DISTR; FIXATION/OMISSION; AND FATIGUE. PERHAPS A MORE STANDARDIZED METHOD (IE; AN ADDED ITEM IN A LNDG CHKLIST) TO CONFIRM RECEIPT OF A LNDG CLRNC COULD PREVENT FUTURE MISHAPS LIKE THIS ONE.