Narrative:

After an ATC delay, a runway change and a rerte, we were finally cleared for takeoff on runway 9L. The first officer went back to make the PA as I pulled onto the runway. When he returned, he took over the aircraft as it was his leg. I confirmed with him that we were cleared to go and he brought the throttles up to 45% N2, then to upright (about 75%) and we started to roll. At that time I looked down the runway and saw a B727 approach the runway from the left about 2000 ft down. Since he seemed to be going a bit fast, I said to the first officer 'hold it.' in other words, don't move the throttles to toga thrust. At this point, the B727 continued across our runway and I aborted the takeoff after about 1000 ft roll total. I asked tower if we had been cleared for takeoff, to which he replied 'yes, cleared for takeoff.' I told him about the other aircraft and that we now had to return to the beginning of the runway for takeoff. I think there was a lack of coordination between local and ground rather than an incursion by the B727, due to the fact that they had just changed from a west operation to an east. 'Cleared for takeoff' doesn't mean the takeoff is clear! Take a look. Supplemental information from acn 475828: good job to my captain scanning entire runway. I will be more vigilant in that respect.

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Original NASA ASRS Text

Title: A B737-300 FLC HAS TO ABORT THEIR TKOF WHEN THE PIC NOTES A B727 TAXIING ACROSS THEIR RWY MIDFIELD ON FREQ WITH GND CTL AT PHL, PA.

Narrative: AFTER AN ATC DELAY, A RWY CHANGE AND A RERTE, WE WERE FINALLY CLRED FOR TKOF ON RWY 9L. THE FO WENT BACK TO MAKE THE PA AS I PULLED ONTO THE RWY. WHEN HE RETURNED, HE TOOK OVER THE ACFT AS IT WAS HIS LEG. I CONFIRMED WITH HIM THAT WE WERE CLRED TO GO AND HE BROUGHT THE THROTTLES UP TO 45% N2, THEN TO UPRIGHT (ABOUT 75%) AND WE STARTED TO ROLL. AT THAT TIME I LOOKED DOWN THE RWY AND SAW A B727 APCH THE RWY FROM THE L ABOUT 2000 FT DOWN. SINCE HE SEEMED TO BE GOING A BIT FAST, I SAID TO THE FO 'HOLD IT.' IN OTHER WORDS, DON'T MOVE THE THROTTLES TO TOGA THRUST. AT THIS POINT, THE B727 CONTINUED ACROSS OUR RWY AND I ABORTED THE TKOF AFTER ABOUT 1000 FT ROLL TOTAL. I ASKED TWR IF WE HAD BEEN CLRED FOR TKOF, TO WHICH HE REPLIED 'YES, CLRED FOR TKOF.' I TOLD HIM ABOUT THE OTHER ACFT AND THAT WE NOW HAD TO RETURN TO THE BEGINNING OF THE RWY FOR TKOF. I THINK THERE WAS A LACK OF COORD BTWN LCL AND GND RATHER THAN AN INCURSION BY THE B727, DUE TO THE FACT THAT THEY HAD JUST CHANGED FROM A W OP TO AN E. 'CLRED FOR TKOF' DOESN'T MEAN THE TKOF IS CLR! TAKE A LOOK. SUPPLEMENTAL INFO FROM ACN 475828: GOOD JOB TO MY CAPT SCANNING ENTIRE RWY. I WILL BE MORE VIGILANT IN THAT RESPECT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.