Narrative:

During rollout after landing on runway 5R at mexico city, we received instructions from the tower. At the time, we were using reverse thrust and the cockpit environment was very noisy. My understanding was that we were cleared to turn left (off of runway 5R) and cross runway 5L. I read back those instructions and we crossed runway 5L. There was conversation in spanish after we received our instructions. When we changed to ground frequency, we were asked to return to tower frequency. Tower informed us that we had crossed runway 5L without clearance and that a DC9 had aborted his takeoff. We were then cleared to ground and taxied in to our gate. Supplemental information from acn 422706: after the aircraft came to a safe taxi speed and in a quieter environment, I discussed the clearance again with the first officer to confirm we were to cross runway 5L. Although taxiway east has an extreme angle, I felt sure no one was on runway 5L. But again, it was very hard to see the far end of the runway at that angle. The clearance was only heard by the PNF and when this occurs a second transmission should be required.

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Original NASA ASRS Text

Title: A UNITED STATES BASED ACR MLG PERFORMS AN UNAUTH RWY XING AT MEXICO CITY CAUSING A DC9 ON TKOF TO ABORT HIS TKOF.

Narrative: DURING ROLLOUT AFTER LNDG ON RWY 5R AT MEXICO CITY, WE RECEIVED INSTRUCTIONS FROM THE TWR. AT THE TIME, WE WERE USING REVERSE THRUST AND THE COCKPIT ENVIRONMENT WAS VERY NOISY. MY UNDERSTANDING WAS THAT WE WERE CLRED TO TURN L (OFF OF RWY 5R) AND CROSS RWY 5L. I READ BACK THOSE INSTRUCTIONS AND WE CROSSED RWY 5L. THERE WAS CONVERSATION IN SPANISH AFTER WE RECEIVED OUR INSTRUCTIONS. WHEN WE CHANGED TO GND FREQ, WE WERE ASKED TO RETURN TO TWR FREQ. TWR INFORMED US THAT WE HAD CROSSED RWY 5L WITHOUT CLRNC AND THAT A DC9 HAD ABORTED HIS TKOF. WE WERE THEN CLRED TO GND AND TAXIED IN TO OUR GATE. SUPPLEMENTAL INFO FROM ACN 422706: AFTER THE ACFT CAME TO A SAFE TAXI SPD AND IN A QUIETER ENVIRONMENT, I DISCUSSED THE CLRNC AGAIN WITH THE FO TO CONFIRM WE WERE TO CROSS RWY 5L. ALTHOUGH TXWY E HAS AN EXTREME ANGLE, I FELT SURE NO ONE WAS ON RWY 5L. BUT AGAIN, IT WAS VERY HARD TO SEE THE FAR END OF THE RWY AT THAT ANGLE. THE CLRNC WAS ONLY HEARD BY THE PNF AND WHEN THIS OCCURS A SECOND XMISSION SHOULD BE REQUIRED.

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.