ACR CLBS THROUGH ASSIGNED ALT.

Narrative

I WAS THE PF (THE FO). WE HAD DONE SEVERAL LEGS OUT OF SACRAMENTO ALREADY THAT DAY AND ARE USUALLY ASSIGNED 9000 FT. BECAUSE OF MD80 TFC ABOVE US; WE WERE ASSIGNED 6000 FT INSTEAD UPON DEP WITH SACRAMENTO APCH. WE BOTH ACKNOWLEDGED THE ALT AND SAW THE TFC IN QUESTION ABOVE US AND ON THE TCASII. WE DID OUR STANDARD ALT CALLS OF 1000 FT AND 100 FT TO GO. WE WERE IN THE MIDST OF DISCUSSING THE FACT THAT THE TFC WE VISUALLY SAW SEEMED TO BE FARTHER AWAY THAN WHAT THE TCASII WAS SAYING; AND WE WERE TRYING TO CONFIRM WITH EACH OTHER THAT THE TFC WE SAW WAS IN FACT THE TFC THE CTLR WAS TRYING TO KEEP US AWAY FROM. WE CONFIRMED THAT IT WAS THE TFC; AND I LOOKED DOWN TO DISCOVER THAT I HAD GONE (CLBED) THROUGH THE ASSIGNED ALT OF 6000 FT BY 320 FT. I QUICKLY DSNDED BACK TO 6000 FT; BUT BY THAT TIME THE CTLR GAVE US 9000 FT AND WE CLBED TO THAT. THIS HAPPENED ON THE 9TH LEG OF A 10 LEG DAY WHERE WE INCUR A LOT OF REDUNDANCY WITH TRIPS. THE POINTS WHICH CONTRIBUTED TO THIS EVENT OCCURRING I BELIEVE WERE: 1) MINOR PLT FATIGUE. 2) REDUNDANCY AND FAMILIARITY. 3) DISTR AND EMPHASIS ON TFC.