Narrative:

I taxied small transport X from wallace factory to hold short of runway 19L. I had another small transport Y taxi out from phh for runway 19L. I coordinated with local control to taxi small transport X across the runway. Local control could not approve the crossing, so I decided to expedite my ground traffic by diverting small transport west to a different intersection and taking small transport Y at phh to the end of runway 19L. When I called small transport Y at phh I used the numbers of small transport X at the wallace intersection and told him to taxi to the end of runway 19L. Small transport X xed the runway while small aircraft Z started his takeoff roll. When I noticed that small transport Y phh was not moving, my scanning caught small transport X crossing at the intersection. I immediately realized my mistake and since small transport X was halfway across the runway and small aircraft Z was nearly 4000' down the runway, I elected to let small transport X continue across and told the local controller to let small aircraft Z take off, since small transport X would be clear before small aircraft Z became a factor. No evasive action was taken by the pilots, no other action by me was required, except to notify my supervisor of what took place. I believe my scanning helped prevent a more serious outcome, but I must endeavor to be more positive in transmitting instructions to be assured that this won't happen again.

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Original NASA ASRS Text

Title: SMT CROSSED RWY WHILE SMA WAS ON TKOF ROLL.

Narrative: I TAXIED SMT X FROM WALLACE FACTORY TO HOLD SHORT OF RWY 19L. I HAD ANOTHER SMT Y TAXI OUT FROM PHH FOR RWY 19L. I COORDINATED WITH LCL CTL TO TAXI SMT X ACROSS THE RWY. LCL CTL COULD NOT APPROVE THE XING, SO I DECIDED TO EXPEDITE MY GND TFC BY DIVERTING SMT W TO A DIFFERENT INTXN AND TAKING SMT Y AT PHH TO THE END OF RWY 19L. WHEN I CALLED SMT Y AT PHH I USED THE NUMBERS OF SMT X AT THE WALLACE INTXN AND TOLD HIM TO TAXI TO THE END OF RWY 19L. SMT X XED THE RWY WHILE SMA Z STARTED HIS TKOF ROLL. WHEN I NOTICED THAT SMT Y PHH WAS NOT MOVING, MY SCANNING CAUGHT SMT X XING AT THE INTXN. I IMMEDIATELY REALIZED MY MISTAKE AND SINCE SMT X WAS HALFWAY ACROSS THE RWY AND SMA Z WAS NEARLY 4000' DOWN THE RWY, I ELECTED TO LET SMT X CONTINUE ACROSS AND TOLD THE LCL CTLR TO LET SMA Z TAKE OFF, SINCE SMT X WOULD BE CLR BEFORE SMA Z BECAME A FACTOR. NO EVASIVE ACTION WAS TAKEN BY THE PLTS, NO OTHER ACTION BY ME WAS REQUIRED, EXCEPT TO NOTIFY MY SUPVR OF WHAT TOOK PLACE. I BELIEVE MY SCANNING HELPED PREVENT A MORE SERIOUS OUTCOME, BUT I MUST ENDEAVOR TO BE MORE POSITIVE IN XMITTING INSTRUCTIONS TO BE ASSURED THAT THIS WON'T HAPPEN AGAIN.

Data retrieved from NASA's ASRS site as of August 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.