Narrative:

Taxiing via the bridge route. At chkpoint 3 we switched to south complex ground frequency of 121.75 but were unable to talk because of heavy usage between ground control and other aircraft. A foreign B727 was told to continue taxi on taxiway C and hold short of taxiway aa. We called for 'taxi to gate' immediately after that, but our transmission was 'stepped on' or blocked by another aircraft. I should have stopped the aircraft short of taxiway C as depicted on the lax 10-9 page. I assumed air carrier Y was holding for us so I continued past taxiway C and stopped. At that point, ground control asked us 'who gave us clearance to cross taxiway C.' we told him we called just prior but got 'blocked' on the frequency. Ground control then instructed air carrier Y to turn right on taxiway aa and taxi to the north complex. After about 2 mins ground told us to continue taxi on taxiway B. Contributing factors were: 1) trying to continue taxiing to gate without stopping to ensure on time arrival. 2) assuming ground control wanted air carrier Y to hold for us. Corrective actions: follow all instructions and clrncs without assuming! Human performance: possible fatigue or impairment of judgement due to sequence of flying over past 48 hours. 'All nighter' from las vegas to chicago with approximately 12 hour layover during the day, then chicago to los angeles.

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Original NASA ASRS Text

Title: AN ACR CAPT TAXIES HIS ACFT PAST THE HOLDING POINT ON TXWY AA AND C WITHOUT HAVING A CLRNC FROM GND CTL.

Narrative: TAXIING VIA THE BRIDGE RTE. AT CHKPOINT 3 WE SWITCHED TO S COMPLEX GND FREQ OF 121.75 BUT WERE UNABLE TO TALK BECAUSE OF HVY USAGE BTWN GND CTL AND OTHER ACFT. A FOREIGN B727 WAS TOLD TO CONTINUE TAXI ON TXWY C AND HOLD SHORT OF TXWY AA. WE CALLED FOR 'TAXI TO GATE' IMMEDIATELY AFTER THAT, BUT OUR XMISSION WAS 'STEPPED ON' OR BLOCKED BY ANOTHER ACFT. I SHOULD HAVE STOPPED THE ACFT SHORT OF TXWY C AS DEPICTED ON THE LAX 10-9 PAGE. I ASSUMED ACR Y WAS HOLDING FOR US SO I CONTINUED PAST TXWY C AND STOPPED. AT THAT POINT, GND CTL ASKED US 'WHO GAVE US CLRNC TO CROSS TXWY C.' WE TOLD HIM WE CALLED JUST PRIOR BUT GOT 'BLOCKED' ON THE FREQ. GND CTL THEN INSTRUCTED ACR Y TO TURN R ON TXWY AA AND TAXI TO THE N COMPLEX. AFTER ABOUT 2 MINS GND TOLD US TO CONTINUE TAXI ON TXWY B. CONTRIBUTING FACTORS WERE: 1) TRYING TO CONTINUE TAXIING TO GATE WITHOUT STOPPING TO ENSURE ON TIME ARR. 2) ASSUMING GND CTL WANTED ACR Y TO HOLD FOR US. CORRECTIVE ACTIONS: FOLLOW ALL INSTRUCTIONS AND CLRNCS WITHOUT ASSUMING! HUMAN PERFORMANCE: POSSIBLE FATIGUE OR IMPAIRMENT OF JUDGEMENT DUE TO SEQUENCE OF FLYING OVER PAST 48 HRS. 'ALL NIGHTER' FROM LAS VEGAS TO CHICAGO WITH APPROX 12 HR LAYOVER DURING THE DAY, THEN CHICAGO TO LOS ANGELES.

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.