Narrative:

My freight arrived on time after my 8 hour wait in buf. I got my clearance as usual and the ATIS. The ground controller asked if I wanted 23 or 32. The winds were around 310 at 17 KTS so I took 32. There was also an mdt taxiing out for the same runway, but much slower, so I went first. Ground cleared me to use the txwys to 32. Then he came back on and said I could back-taxi the runway and hold in position. So I started down the runway and did my checklists. At the same time, the ground controller, who is also working tower, clears someone else to land 32. So I start looking and see another aircraft probably at least 7 mi out. No problem. Then the controller comes on the radio and asks if I would be ready at the end for an immediate takeoff. I said sure. So I taxi to the end and call that I am rolling 32, just as he was telling the mdt behind me to cross 32. He gets on the radio and tells me to abort takeoff. So I do, clear the runway and realize my huge mistake. He never cleared me. The mdt never was on the runway with me and I made a taxiway abort 1/4 down the runway. I guess it was the combination radio chatter, change of plans between runway order, and tower and ground, and ready to go home. The controller was excellent about the incident and never said a word. But it taught me to listen up even if you are on the runway and never take flying as routine as it seems sometimes.

Related reports:

Google
 

Original NASA ASRS Text

Title: UNAUTH TKOF.

Narrative: MY FREIGHT ARRIVED ON TIME AFTER MY 8 HR WAIT IN BUF. I GOT MY CLRNC AS USUAL AND THE ATIS. THE GND CTLR ASKED IF I WANTED 23 OR 32. THE WINDS WERE AROUND 310 AT 17 KTS SO I TOOK 32. THERE WAS ALSO AN MDT TAXIING OUT FOR THE SAME RWY, BUT MUCH SLOWER, SO I WENT FIRST. GND CLRED ME TO USE THE TXWYS TO 32. THEN HE CAME BACK ON AND SAID I COULD BACK-TAXI THE RWY AND HOLD IN POS. SO I STARTED DOWN THE RWY AND DID MY CHKLISTS. AT THE SAME TIME, THE GND CTLR, WHO IS ALSO WORKING TWR, CLRS SOMEONE ELSE TO LAND 32. SO I START LOOKING AND SEE ANOTHER ACFT PROBABLY AT LEAST 7 MI OUT. NO PROB. THEN THE CTLR COMES ON THE RADIO AND ASKS IF I WOULD BE READY AT THE END FOR AN IMMEDIATE TKOF. I SAID SURE. SO I TAXI TO THE END AND CALL THAT I AM ROLLING 32, JUST AS HE WAS TELLING THE MDT BEHIND ME TO CROSS 32. HE GETS ON THE RADIO AND TELLS ME TO ABORT TKOF. SO I DO, CLR THE RWY AND REALIZE MY HUGE MISTAKE. HE NEVER CLRED ME. THE MDT NEVER WAS ON THE RWY WITH ME AND I MADE A TXWY ABORT 1/4 DOWN THE RWY. I GUESS IT WAS THE COMBINATION RADIO CHATTER, CHANGE OF PLANS BTWN RWY ORDER, AND TWR AND GND, AND READY TO GO HOME. THE CTLR WAS EXCELLENT ABOUT THE INCIDENT AND NEVER SAID A WORD. BUT IT TAUGHT ME TO LISTEN UP EVEN IF YOU ARE ON THE RWY AND NEVER TAKE FLYING AS ROUTINE AS IT SEEMS SOMETIMES.

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.