Narrative:

I was second in line for takeoff. A C152 with an instructor and student were #1 and preparing for takeoff. They announced they were taking off runway 15. Initially, I watched them as they started to roll down the runway. I then started to read through my pre-takeoff checklist. When completed, I announced on unicom that I was preparing to position for takeoff on runway 15 as I looked down the runway. As I looked down the runway, I noticed an aircraft taxiing along the parallel taxiway. I started my takeoff roll and reached takeoff speed when about the same time I noticed the aircraft that I had thought was taxiing on the parallel taxiway was actually the same C152 that had taken off before me and aborted their takeoff. When I noticed the aircraft was on the same runway, I moved to the left side and continued the takeoff. I was sure that if I discontinued the takeoff, I would not be able to stop on the remaining runway. I believe that the instructor and student had some type of failure on takeoff. They became too distracted and failed to announce their aborted takeoff and rolled to the right side of the runway. After my takeoff, I ran through the entire event to see what else I could have done. As I was taxiing and before, I received radio checks that were loud and clear. I even had a radio check with the C152 and I received a loud and clear. When aircraft are taxiing down the parallel taxiway, it can give the impression that they are on the runway and vice versa as in this case.

Related reports:

Google
 

Original NASA ASRS Text

Title: NEAR GND COLLISION BTWN A C172 ON AN ABORTED TKOF AND A PA32 ON TKOF ROLL AT A NON TWR ARPT UNICOM AT LNA, FL.

Narrative: I WAS SECOND IN LINE FOR TKOF. A C152 WITH AN INSTRUCTOR AND STUDENT WERE #1 AND PREPARING FOR TKOF. THEY ANNOUNCED THEY WERE TAKING OFF RWY 15. INITIALLY, I WATCHED THEM AS THEY STARTED TO ROLL DOWN THE RWY. I THEN STARTED TO READ THROUGH MY PRE-TKOF CHKLIST. WHEN COMPLETED, I ANNOUNCED ON UNICOM THAT I WAS PREPARING TO POS FOR TKOF ON RWY 15 AS I LOOKED DOWN THE RWY. AS I LOOKED DOWN THE RWY, I NOTICED AN ACFT TAXIING ALONG THE PARALLEL TXWY. I STARTED MY TKOF ROLL AND REACHED TKOF SPD WHEN ABOUT THE SAME TIME I NOTICED THE ACFT THAT I HAD THOUGHT WAS TAXIING ON THE PARALLEL TXWY WAS ACTUALLY THE SAME C152 THAT HAD TAKEN OFF BEFORE ME AND ABORTED THEIR TKOF. WHEN I NOTICED THE ACFT WAS ON THE SAME RWY, I MOVED TO THE L SIDE AND CONTINUED THE TKOF. I WAS SURE THAT IF I DISCONTINUED THE TKOF, I WOULD NOT BE ABLE TO STOP ON THE REMAINING RWY. I BELIEVE THAT THE INSTRUCTOR AND STUDENT HAD SOME TYPE OF FAILURE ON TKOF. THEY BECAME TOO DISTRACTED AND FAILED TO ANNOUNCE THEIR ABORTED TKOF AND ROLLED TO THE R SIDE OF THE RWY. AFTER MY TKOF, I RAN THROUGH THE ENTIRE EVENT TO SEE WHAT ELSE I COULD HAVE DONE. AS I WAS TAXIING AND BEFORE, I RECEIVED RADIO CHKS THAT WERE LOUD AND CLR. I EVEN HAD A RADIO CHK WITH THE C152 AND I RECEIVED A LOUD AND CLR. WHEN ACFT ARE TAXIING DOWN THE PARALLEL TXWY, IT CAN GIVE THE IMPRESSION THAT THEY ARE ON THE RWY AND VICE VERSA AS IN THIS CASE.

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.