FLC OF AN LTT ACR ACFT FATIGUE DUE TO COMPANY DUTY SCHEDULE.

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ONCE AGAIN; I'M WRITING TO DESCRIBE A SIT PERTAINING TO CHRONIC FATIGUE AND THE CONSTANT USE OF REDUCED REST BY OUR COMPANY. AFTER TAKING THE RWY FOR DEP; I CALLED FOR LINE-UP ITEMS WHICH THE FO READ OFF BEING COMPLETED. WHEN I ADVANCED THE THROTTLES WE GOT A 3 BEEP 'TKOF TRIM' WARNING. THIS OBVIOUSLY COULD HAVE BEEN A VERY SERIOUS SIT. AFTER FURTHER REVIEW OF THE SIT; NOT ONLY HAD HE NOT PUT THE TRIM IN THE GREEN; HE HAD MISSED TURNING THE XPONDER ON AND FORGOTTEN TO PRESELECT THE DEP CLRNC. SUPPLEMENTAL INFO FROM ACN 254445: I WAS UNABLE TO PERFORM MY DUTIES AT 100 PERCENT DUE TO FATIGUE. MISSED SEVERAL RADIO CALLS AND CHKLIST RESPONSES. FLT COMPLETED WITHOUT INCIDENT. I WAS SCHEDULED FOR 3 'BACK-TO-BACK' CONTINUOUS DUTY TRIPS. FATIGUE OCCURRED DURING SECOND TRIP. ALL 3 TRIPS RPT AT XX25PM (LATE) AND RELEASE AT AB42AM EARLY THE FOLLOWING DAY (11 HRS/7 MINS CONTINUOUS DUTY). THEY CONSIST OF A 30 MIN FLT TO DAB; POST-FLT; TRAVEL TO HOTEL; REST; XX50 RPT; TRAVEL TO ARPT; PREFLT; 30 MIN FLT TO MCO AND POST-FLT. ON PAPER REST EQUALS 7 HRS 30 MINS. IN ACTUALITY; REST EQUALS APPROX 6 HR 15 MINS DUE TO ROUND TRIP VAN RIDE AND 45 MIN SHOWER; DRESS; ETC. REST IS FURTHER REDUCED IF A PERSON CANNOT WALK IN TO A STRANGE HOTEL ROOM; RIP OFF THEIR CLOTHES AND BE ASLEEP BEFORE THEIR HEADS HIT THE PILLOW. THE FIRST TRIP WAS PRECEDED BY 1 HR 25 MINS. OF 'ON CALL RESERVE' DUTY WITH 1 HR RPT; AND NO OPPORTUNITY FOR REST. CAT NAPS AFTER THE FIRST TRIP DID NOT; REPEAT; NOT MAKE UP FOR LOST SLEEP. I STARTED THE SECOND TRIP TIRED BUT DID NOT FEEL MY PERFORMANCE WOULD BE IMPAIRED. IT WAS. I DID NOT FLY THE THIRD TRIP. I REALIZE CONTINUOUS DUTY TRIPS ARE A FACT OF LIFE IN THIS BUSINESS. BUT; SCHEDULING CONTINUOUS DUTY TRIPS BACK-TO-BACK IS DANGEROUS AND SHOULD BE ADDRESSED IMMEDIATELY; THE FIRST DAY I WAS ON 'DUTY' 23 HRS 42 MINS.