Narrative:

Day VMC lax. Landed runway 24R, cleared to cross runway 24L taxiway Z, exited on taxiway east. Told to hold short of E13 while B747 repositioned under tow. Resumed taxi with instructions 'taxiway east, taxiway D10, taxiway D to gate.' I wrote down the instructions, read back to ground and captain confirmed to me 'taxiway east, taxiway D10, taxiway D.' I looked at chart to confirm route. Abeam taxiway west, captain started turning left. I was surprised at the left turn (shocked). By the time I could say anything, we were on runway 24L. No aircraft were on approach to the left or holding in position or taking off. There were no distrs in the cockpit. Ground was unusually quiet for lax (not many aircraft on deck). As soon as he commenced the left turn, I should have just said 'stop.' I was so shocked based on the clearance and my understanding of the taxi route assigned, I hesitated momentarily thinking there must have been a call that I missed. By the time I realized what was happening, it was too late. Lesson learned: once the route is assigned, reviewed, any turns contrary to my understanding of the route will be challenged with the word 'stop!' the event was caused by what can best be described as a 'brain void.' contributing factor was my momentary hesitation and not challenging his action with 'stop' based upon my understanding of the assigned taxi route. There are no excuses -- he 'brain voided' and I was too slow in challenging his actions. Supplemental information from acn 566298: when we arrived at E-10, I made a left turn instead of a right turn and immediately saw that I had taxied onto runway 24L. We were then cleared to taxi and clear the runway at E-8 and taxi to the gate. There were no aircraft waiting for takeoff on runway 24L and 1 aircraft on arrival for runway 24R. I unfortunately had the lay in my mind that we were on the inner (D) and that we were to pass the facing B737 on the outer -- wrong! The visual cues that led me into this situation were: 1) no aircraft waiting for departure on runway 24L, 2) facing the B737 which I thought was on taxiway D. Had there been local activity on runway 24L, I doubt that this event would have occurred.

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Original NASA ASRS Text

Title: B737 FLT CREW HAS RWY INCURSION AT LAX.

Narrative: DAY VMC LAX. LANDED RWY 24R, CLRED TO CROSS RWY 24L TXWY Z, EXITED ON TXWY E. TOLD TO HOLD SHORT OF E13 WHILE B747 REPOSITIONED UNDER TOW. RESUMED TAXI WITH INSTRUCTIONS 'TXWY E, TXWY D10, TXWY D TO GATE.' I WROTE DOWN THE INSTRUCTIONS, READ BACK TO GND AND CAPT CONFIRMED TO ME 'TXWY E, TXWY D10, TXWY D.' I LOOKED AT CHART TO CONFIRM RTE. ABEAM TXWY W, CAPT STARTED TURNING L. I WAS SURPRISED AT THE L TURN (SHOCKED). BY THE TIME I COULD SAY ANYTHING, WE WERE ON RWY 24L. NO ACFT WERE ON APCH TO THE L OR HOLDING IN POS OR TAKING OFF. THERE WERE NO DISTRS IN THE COCKPIT. GND WAS UNUSUALLY QUIET FOR LAX (NOT MANY ACFT ON DECK). AS SOON AS HE COMMENCED THE L TURN, I SHOULD HAVE JUST SAID 'STOP.' I WAS SO SHOCKED BASED ON THE CLRNC AND MY UNDERSTANDING OF THE TAXI RTE ASSIGNED, I HESITATED MOMENTARILY THINKING THERE MUST HAVE BEEN A CALL THAT I MISSED. BY THE TIME I REALIZED WHAT WAS HAPPENING, IT WAS TOO LATE. LESSON LEARNED: ONCE THE RTE IS ASSIGNED, REVIEWED, ANY TURNS CONTRARY TO MY UNDERSTANDING OF THE RTE WILL BE CHALLENGED WITH THE WORD 'STOP!' THE EVENT WAS CAUSED BY WHAT CAN BEST BE DESCRIBED AS A 'BRAIN VOID.' CONTRIBUTING FACTOR WAS MY MOMENTARY HESITATION AND NOT CHALLENGING HIS ACTION WITH 'STOP' BASED UPON MY UNDERSTANDING OF THE ASSIGNED TAXI RTE. THERE ARE NO EXCUSES -- HE 'BRAIN VOIDED' AND I WAS TOO SLOW IN CHALLENGING HIS ACTIONS. SUPPLEMENTAL INFO FROM ACN 566298: WHEN WE ARRIVED AT E-10, I MADE A L TURN INSTEAD OF A R TURN AND IMMEDIATELY SAW THAT I HAD TAXIED ONTO RWY 24L. WE WERE THEN CLRED TO TAXI AND CLR THE RWY AT E-8 AND TAXI TO THE GATE. THERE WERE NO ACFT WAITING FOR TKOF ON RWY 24L AND 1 ACFT ON ARR FOR RWY 24R. I UNFORTUNATELY HAD THE LAY IN MY MIND THAT WE WERE ON THE INNER (D) AND THAT WE WERE TO PASS THE FACING B737 ON THE OUTER -- WRONG! THE VISUAL CUES THAT LED ME INTO THIS SIT WERE: 1) NO ACFT WAITING FOR DEP ON RWY 24L, 2) FACING THE B737 WHICH I THOUGHT WAS ON TXWY D. HAD THERE BEEN LCL ACTIVITY ON RWY 24L, I DOUBT THAT THIS EVENT WOULD HAVE OCCURRED.

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.