Narrative:

On a short taxi to runway 27R at mia, we were told to be ready for an immediate departure, so I made an announcement to the flight attendants. I had just got a new boom microphone, and the ear piece was somewhat loose. I heard tower issue departure clearance with the call sign ending with xx. The copilot read it back, and I added the power to take the runway and take off. Something in the overlapping communications bothered me, though, because I realized I had heard a #9. So I asked the copilot if he was sure now that this was for us. He said it was -- rather than verifying it, which is what I really wanted him to do. I rationalized the #9 being a mistaken runway number for a split second, but I realized also, by this time, I did not hear the whole clearance for myself! I looked down the runway and heard tower call for our abort, which we did immediately below airspeed indication and taxied off within the first 1000 ft or so. As we cleared the runway, we heard another pilot come on the air and state 'that's a runway incursion.' we talked to the tower on another frequency, and they said that they had cleared another aircraft to cross at the far end of the field, but he had not crossed the line before we had gotten off, and that the original clearance was for aircraft air carrier Y on runway 27L. My copilot's response was blocked except for the #xx, which tower heard at the end of air carrier Y's response to its clearance. The 2 communications totally overlapped. Tower also stated that the captain from flight air carrier Z was the person who kept interrupting them with legalities over an incursion before they could even review the tapes. Supplemental information from acn 583450: shortly after the B757 was airborne, I heard air carrier X cleared for immediate takeoff no delay. I responded 'aircraft X cleared for takeoff,' and did not hear anything else from the tower. Power was set when at the same time, we saw another aircraft at the end of the runway beginning to cross runway 27R, and tower calling for us to abort. Tower was very quick to catch the confusion, and called for the immediate abort.

Related reports:

Google
 

Original NASA ASRS Text

Title: MD80 EXPERIENCES ATC DIRECTED TKOF ABORT AT MIA.

Narrative: ON A SHORT TAXI TO RWY 27R AT MIA, WE WERE TOLD TO BE READY FOR AN IMMEDIATE DEP, SO I MADE AN ANNOUNCEMENT TO THE FLT ATTENDANTS. I HAD JUST GOT A NEW BOOM MIKE, AND THE EAR PIECE WAS SOMEWHAT LOOSE. I HEARD TWR ISSUE DEP CLRNC WITH THE CALL SIGN ENDING WITH XX. THE COPLT READ IT BACK, AND I ADDED THE PWR TO TAKE THE RWY AND TAKE OFF. SOMETHING IN THE OVERLAPPING COMS BOTHERED ME, THOUGH, BECAUSE I REALIZED I HAD HEARD A #9. SO I ASKED THE COPLT IF HE WAS SURE NOW THAT THIS WAS FOR US. HE SAID IT WAS -- RATHER THAN VERIFYING IT, WHICH IS WHAT I REALLY WANTED HIM TO DO. I RATIONALIZED THE #9 BEING A MISTAKEN RWY NUMBER FOR A SPLIT SECOND, BUT I REALIZED ALSO, BY THIS TIME, I DID NOT HEAR THE WHOLE CLRNC FOR MYSELF! I LOOKED DOWN THE RWY AND HEARD TWR CALL FOR OUR ABORT, WHICH WE DID IMMEDIATELY BELOW AIRSPD INDICATION AND TAXIED OFF WITHIN THE FIRST 1000 FT OR SO. AS WE CLRED THE RWY, WE HEARD ANOTHER PLT COME ON THE AIR AND STATE 'THAT'S A RWY INCURSION.' WE TALKED TO THE TWR ON ANOTHER FREQ, AND THEY SAID THAT THEY HAD CLRED ANOTHER ACFT TO CROSS AT THE FAR END OF THE FIELD, BUT HE HAD NOT CROSSED THE LINE BEFORE WE HAD GOTTEN OFF, AND THAT THE ORIGINAL CLRNC WAS FOR ACFT ACR Y ON RWY 27L. MY COPLT'S RESPONSE WAS BLOCKED EXCEPT FOR THE #XX, WHICH TWR HEARD AT THE END OF ACR Y'S RESPONSE TO ITS CLRNC. THE 2 COMS TOTALLY OVERLAPPED. TWR ALSO STATED THAT THE CAPT FROM FLT ACR Z WAS THE PERSON WHO KEPT INTERRUPTING THEM WITH LEGALITIES OVER AN INCURSION BEFORE THEY COULD EVEN REVIEW THE TAPES. SUPPLEMENTAL INFO FROM ACN 583450: SHORTLY AFTER THE B757 WAS AIRBORNE, I HEARD ACR X CLRED FOR IMMEDIATE TKOF NO DELAY. I RESPONDED 'ACFT X CLRED FOR TKOF,' AND DID NOT HEAR ANYTHING ELSE FROM THE TWR. PWR WAS SET WHEN AT THE SAME TIME, WE SAW ANOTHER ACFT AT THE END OF THE RWY BEGINNING TO CROSS RWY 27R, AND TWR CALLING FOR US TO ABORT. TWR WAS VERY QUICK TO CATCH THE CONFUSION, AND CALLED FOR THE IMMEDIATE ABORT.

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.