AN ACR FLC ON AN L1011 STARTS THEIR DSCNT EARLY AT CIVET WHEN THEY REF THEIR FMS ONLY; WITHOUT USING AVAILABLE VOR AND DME RAW DATA. FLC STATES THAT THEY FOLLOWED COMPANY PROC AND THEY THEN COMPLAIN ABOUT AGING ACFT.

Narrative

AFTER REACHING CIVET ON THE FMS AND FRM (FROM) CIVET WAS DISPLAYED; WE BEGAN OUR DSCNT TO CROSS THE NEXT FIX; BREMR; AT 12000 FT. AFTER CIVET WE ALSO SWITCHED FROM FMS NAV TO VOR/DME NAV UTILIZING THE LAX ILS/DME TO RWY 25L; PER PLT'S APCH CHKLIST WHICH DICTATES THAT RADIO/NAV SWITCHES BE PLACED IN THE RADIO POS. AS THE LAX ILS/DME FREQ WAS BEING TUNED AND IDENTED; ATC INFORMED US THAT THEIR RADAR SHOWED THAT WE WERE NOT YET AT CIVET AND HAD BEGUN OUR DSCNT PRIOR TO CIVET. AFTER CONFIRMING OUR POS WITH ATC; WE DETERMINED THAT THE FMS WAS IN ERROR AT CIVET BY APPROX 4 MI. WE CONFIRMED THAT THE LATITUDE AND LONGITUDE IN THE DATABASE WERE CORRECT FOR CIVET AND WE MADE A MAINT LOGBOOK ENTRY TO THIS EFFECT AFTER ARRIVING LAX FOR MAINT TROUBLESHOOTING OF THIS FMS PROB. ALSO; ALL 3 CREW MEMBERS VERIFIED THAT WE HAD INDEED PASSED CIVET ON THE FMS DISPLAY AND WERE NOW ENRTE TO BREMR. WE RECEIVED NO TCASII ALERTS AND WERE IN VMC. THE BAL OF THE ARR; APCH; AND LNDG ON RWY 25L WERE NORMAL. THE PROB: AS THE L1011 AGES; MORE PROBS LIKE THIS WILL APPEAR AND SPECIAL ATTN MUST BE GIVEN TO NOT ONLY THE NAV SYS BUT TO ALL THE MAINT CONCERNS OF AN OLDER ACFT.