MLG ABORTS TKOF AS WARNING HORN SOUNDS.

Narrative

AS WE ADVANCED THE THROTTLES FOR TKOF; THE TKOF WARNING HORN SOUNDED. WE REJECTED THE TKOF AND TAXIED CLR OF RWY. WE CHKED TO SEE IF THE FLAPS; SPDBRAKE; OR TRIM TABS WERE NOT SET; BUT EVERYTHING WAS SET IN THE CORRECT POS FOR TKOF. I TOLD THE CAPT THAT WE SHOULD GO BACK TO THE GATE 3 TIMES. HE SAID THERE WAS NOTHING WRONG WITH THE ACFT AND THAT HE WAS GOING TO TKOF. IN GND SCHOOL; IT HAS BEEN SUGGESTED THAT FOR ANY REJECTED TKOF WE SHOULD RETURN TO THE GATE AND MAKE SOME TYPE OF WRITE-UP IN THE LOGBOOK. TO MAKE A LONG STORY SHORT; WE RE-RAN THE CHKLIST; MADE ANOTHER TKOF; WHICH WAS UNEVENTFUL. THE ONLY THING WE FOUND THAT MIGHT HAVE CAUSED THE TKOF HORN WAS THE POINTER ON ONE OF THE TRIM WHEELS WAS NOT ALIGNED WITH THE OTHER POINTER. THE TRIM SETTING THAT WE WERE USING PUT THE LINE OF THE POINTER CLOSE TO THE LIMIT FOR TKOF. WHEN A PERSON SHOULD RETURN TO THE GATE AFTER AN ATTEMPTED TKOF IS NOT A CLRLY DEFINED AREA. MAYBE IT SHOULD BE BETTER DEFINED IN COMPANY TRAINING AND OPS MANUALS.