A B727 FLC ABORTS THEIR TKOF AT TAXI SPD WHEN THE SO NOTES THE FAILURE OF THE AUTO PACK TRIP TO ARM AFTER PWR APPLICATION AT DFW; TX.

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LOCATION: RWY 17L. AFTER APPLYING TKOF PWR THE FE ANNOUNCED AUTO PACK TRIP FAILED TO ARM. I REDUCED PWR TO IDLE AND FO NOTIFIED TWR OF THE ABORT. THE ACFT NEVER ACCELERATED BEYOND TAXI SPD AND I EXITED THE RWY AT TXWY Y. I THEN MADE A PA TO THE PAX INFORMING THEM OF THE REASON FOR THE ABORT AND TO REMAIN SEATED. I ALSO CHKED IN WITH THE PURSER. THE BRAKE COOLING CHART WAS NOT CONSULTED DUE TO THE LOW SPD AND LACK OF BRAKING REQUIRED. I THEN CONTACTED DISPATCH TO NOTIFY THEM OF THE PROB AND ASKED WHETHER THEY WOULD RATHER I TAKE THE ACFT TO THE GATE OR CREW PLACARD THE SYS UNDER PROVISIONS OF MEL X. WE AGREED TO FLC PLACARD THE SYS INOP UNDER MEL 71-X AND CONSULTED OP MANUAL SECTION X PAGE 29-X AND TAXI/TKOF SECTION PAGE XX. DISPATCH MADE CORRECTIONS TO RWY LIMITED WT AND LOADS GAVE US NEW DATA FOR TKOF AT FLAPS 5 DEGS; MAX PWR; AIR CONDITIONING OFF. WE REACCOMPLISHED THE BEFORE TKOF CHKLIST AND A PA WAS MADE EXPLAINING THE PROB AND SOLUTION TO THE PAX. TAKE OFF WAS THEN MADE USING NEW PERFORMANCE DATA AND TKOF CONFIGN.