CAPT OF AN MD88 FAILED TO HOLD SHORT OF RWY AS INSTRUCTED IN TAXI INSTRUCTIONS CAUSING TWR TO INTERVENE IN ORDER TO CLR RWY.

Narrative

AFTER PUSHBACK FROM THE GATE WE WERE CLRED TO TAXI TO RWY 9 VIA TXWYS K; S; HOLD SHORT OF RWY 4L. AS WE APCHED TXWY S; THE CAPT ASKED WHAT DEP WE WERE CLRED FOR. I SEARCHED FOR AND FOUND THE PDC AND TURNED TO THE LOGAN 1 DEP IN THE AIRWAY MANUAL. I THEN READ THE RWY SPECIFIC INSTRUCTIONS FOR THE DEP. AS I LOOKED UP AGAIN I NOTICED WE WERE XING THE THRESHOLD OF RWY 4L. I THEN INFORMED THE CAPT THAT WE WERE ON AN ACTIVE RWY AND WERE TOLD TO HOLD SHORT. GND CTL CALLED US AND INSTRUCTED US TO CONTINUE TAXIING CLR OF THE RWY AND CONTACT TWR. UPON CONTACTING TWR; WE WERE CLRED INTO POS AND HOLD FOR RWY 9. THE CAPT INFORMED ME THAT HE ONLY HEARD TAXI TO RWY 9 VIA TXWYS K AND S. THE TWR CTLR GAVE US A PHONE NUMBER OF THE ATC SUPVR TO CALL. FACTORS THAT I THINK CONTRIBUTED TO THE RWY INCURSION ARE: POOR WX CONDITIONS; IE; DARKNESS; HVY RAIN; DRIVING WINDS (080 DEGS AT 25 KTS GUSTING TO 35 KTS); TIME OF DAY XZ15 AM (XX45 PICKUP FROM HOTEL). THE CAPT WAS ALSO VERY CONCERNED ABOUT THE DETERIORATING WX CONDITIONS WHICH PROBABLY CAUSED HIM TO MISS THE HOLD SHORT CLRNC. THE WINDSHIELD WIPERS WERE ON WHICH CAUSES A LOUD NOISE IN THE COCKPIT. BY LOOKING UP THE LOGAN 1 DEP AND READING THE INSTRUCTIONS; I COULD NOT BACK UP THE TAXI PROGRESS. UPON RECEIVING TAXI INSTRUCTIONS; I SHOULD HAVE HAD THE CAPT ACKNOWLEDGE VERBALLY THE HOLD SHORT INSTRUCTIONS. WE ARE ALSO AN ATLANTA BASED FLC AND ARE UNFAMILIAR WITH BOS ARPT.