AN E110 FAILED TO COMPLY WITH A 'POS AND HOLD CLRNC.' FLT DEPARTED. CLRNC TKOF NOT RECEIVED.

Narrative

TYLER TWR CLRED US TO 'TAXI INTO POS AND HOLD.' I READ BACK THE CLRNC; AND THE CAPT CALLED FOR 'TKOF CHKLIST ALL THE WAY.' OUR PROC IS TO CALL 'TKOF CHKLIST TO THE LINE' FOR A POS AND HOLD CLRNC; AND TO CALL FOR 'BELOW THE LINE' AFTER TKOF CLRNC HAS BEEN RECEIVED. I COMPLETED THE TKOF CHKLIST; THE CAPT LINED THE ACFT UP ON THE RWY; AND STATED 'YOU HAVE THE BRAKES.' NOT BEING FULLY CONSCIOUS OF THE SIT; I ASKED THE CAPT 'DID HE SAY FLY RWY HDG; OR L TURN ON COURSE?' THE CAPT REPLIED 'LET'S JUST GO; WE'LL FIND OUT.' I THEN COMMENCED THE TKOF ROLL. AFTER CLB PWR SET AT 400 FT AGL; THE CAPT CALLED TWR AND ASKED; 'WAS THAT RWY HDG; OR L TURN ON COURSE?' THE TWR REPLIED; 'WELL; ACTUALLY; SIR; THAT WAS 'POS AND HOLD.' THE FEELING IN MY GUT CONFIRMED THAT THE CTLR WAS RIGHT. WHAT MAY HAVE CONTRIBUTED? THE NIGHT BEFORE WAS A REDUCED REST OVERNIGHT; AND WE WERE BOTH TIRED AND NOT FULLY SITUATIONALLY AWARE; NON COMPLIANCE WITH ESTABLISHED COMPANY PROCS; AND THE CAPT'S OBVIOUS DESIRE TO GET HOME IN A HURRY; TO GET THE DAY OVER WITH. I CALL THIS 'LAST LEG HOME SYNDROME.'