RWY TRANSGRESSION.

Narrative

WHILE TAXIING FOR TKOF RWY 36 AT DCA I WAS TOLD TO TRANSITION FROM TXWY K TO TXWY J IN ORDER TO CROSS RWY 3 AT TXWY D. OUR ACARS WAS INOP AND MY FO WAS ON COMPANY FREQ TRYING TO GET OUR TKOF WTS. I READ THE TAXI CLRNC BACK TO GND CTL AND MOVED OVER TO THE OUTER TXWY. I THOUGHT I WAS CLRED TO CROSS RWY 3 AT TXWY D WHICH WOULD HAVE PUT ME IN THE #1 SPOT FOR TKOF ON RWY 36. I THINK THAT I REPLIED IN THAT MANNER. AS I APCHED RWY 3 I OBSERVED AN AIRPLANE LNDG ON RWY 36; WHICH WOULD HAVE PRECLUDED ANYBODY TAKING OFF ON RWY 3; BUT AS I APCHED THE HOLD SHORT LINE FOR RWY 3 I OBSERVED A SAAB LINING UP FOR TKOF ON RWY 3. I STARTED TO BRAKE. JUST AT THAT TIME MY FO HAD FINISHED UP WITH THE TKOF NUMBERS; AND HE ALSO NOTED THE SAAB AND SAID 'WHAT'S GOING ON HERE.' AT THAT EXACT TIME GND CTL YELLED AT ME TO 'HOLD SHORT OF RWY 3 - - THAT I HAD BEEN CLRED TO HOLD SHORT.' I WAS STOPPING ALREADY AS HARD AS POSSIBLE. WE WERE NEAR GROSS WT (97000 LBS) AND I GOT STOPPED WITH ABOUT 1/3 OF THE PLANE OVER THE FOUL LINE. I REPLIED THAT I THOUGHT I HAD BEEN CLRED TO CROSS AT TXWY D. THE CTLR THEN ADVISED ME THE SAAB WAS HOLDING IN POS AND I WAS CLRED TO CROSS. I HAD BEEN WATCHING THE SAAB AND WAS WELL AWARE OF HIS POS; BUT I THOUGHT HE WAS GOING TO CROSS RWY 3 AT CHARLIE AND TKOF ON RWY 36 BEHIND ME. I WAS SURPRISED TO SEE HIM LINE UP ON RWY 3 AND I WOULD NOT HAVE CROSSED RWY 3 WITHOUT CONFIRMING MY CLRNC; BUT I WAS BUSY MAKING A HARD STOP AND MY FO WAS ON A DIFFERENT FREQ. BECAUSE THE COMPUTERS WERE DOWN; OUR OPS HAD TO DO WT AND BAL BY HAND AND BECAUSE WE WERE #1 FOR TKOF; WE WERE TRYING TO DO TOO MANY THINGS AT ONCE.