Narrative:

I had finished run up and pre-takeoff checklist. On run up pad, for runway 28, my aircraft was facing on a 45 degree heading during run up. Advised trk unicom that taxiing into position on runway 28. (A local mechanic was acting as copilot.) neither copilot nor I heard any other aircraft call in the traffic pattern prior to our call. Neither he nor I saw any other aircraft on a left base leg, final or anywhere in the vicinity. I taxied into position on runway 28, stopped, brought the engines up to power, stabilized and released brakes started takeoff roll. About 50' into takeoff roll a male voice was heard on the radio advising me that I had pulled out onto the runway while he was on final. About that time a small, white single engine low wing aircraft passed above us and to our right side on a 280 degree heading. I immediately apologized to him, advising that I had not had an aircraft in sight before taxiing onto the runway. My call to trk unicom was made approximately 1 min before actually taking position on the runway, or even getting onto the runway. At no time did we hear a call that another aircraft was on final approach. Frankly I am completely at loss as to why we did not see the other aircraft, and also cannot understand why he made no call, that we could hear, on base leg or final approach--especially advising us that he was on final approach when I made my call that we were taxiing into position on runway 28. I did hear a very weak, garbled transmission when he was overhead at the end of the airport, but could not understand it. My radios were working fine in both transmission and receive, as I had made a check with trk unicom prior to taxiing. We possibly both looked into the sun for an instant on our scan, prior to taking position on the runway, but do not believe this would not enable us to see an aircraft on final. I have been operating from this airport for over 4 yrs west/O incident, but it just shows extreme vigilant visual scanning is required by all parties in these situations.

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Original NASA ASRS Text

Title: GA SMT ENTERED RWY FOR TKOF CAUSING GA SMA ON SHORT FINAL TO GO AROUND.

Narrative: I HAD FINISHED RUN UP AND PRE-TKOF CHKLIST. ON RUN UP PAD, FOR RWY 28, MY ACFT WAS FACING ON A 45 DEG HDG DURING RUN UP. ADVISED TRK UNICOM THAT TAXIING INTO POS ON RWY 28. (A LCL MECH WAS ACTING AS COPLT.) NEITHER COPLT NOR I HEARD ANY OTHER ACFT CALL IN THE TFC PATTERN PRIOR TO OUR CALL. NEITHER HE NOR I SAW ANY OTHER ACFT ON A LEFT BASE LEG, FINAL OR ANYWHERE IN THE VICINITY. I TAXIED INTO POS ON RWY 28, STOPPED, BROUGHT THE ENGS UP TO PWR, STABILIZED AND RELEASED BRAKES STARTED TKOF ROLL. ABOUT 50' INTO TKOF ROLL A MALE VOICE WAS HEARD ON THE RADIO ADVISING ME THAT I HAD PULLED OUT ONTO THE RWY WHILE HE WAS ON FINAL. ABOUT THAT TIME A SMALL, WHITE SINGLE ENG LOW WING ACFT PASSED ABOVE US AND TO OUR RIGHT SIDE ON A 280 DEG HDG. I IMMEDIATELY APOLOGIZED TO HIM, ADVISING THAT I HAD NOT HAD AN ACFT IN SIGHT BEFORE TAXIING ONTO THE RWY. MY CALL TO TRK UNICOM WAS MADE APPROX 1 MIN BEFORE ACTUALLY TAKING POS ON THE RWY, OR EVEN GETTING ONTO THE RWY. AT NO TIME DID WE HEAR A CALL THAT ANOTHER ACFT WAS ON FINAL APCH. FRANKLY I AM COMPLETELY AT LOSS AS TO WHY WE DID NOT SEE THE OTHER ACFT, AND ALSO CANNOT UNDERSTAND WHY HE MADE NO CALL, THAT WE COULD HEAR, ON BASE LEG OR FINAL APCH--ESPECIALLY ADVISING US THAT HE WAS ON FINAL APCH WHEN I MADE MY CALL THAT WE WERE TAXIING INTO POS ON RWY 28. I DID HEAR A VERY WEAK, GARBLED XMISSION WHEN HE WAS OVERHEAD AT THE END OF THE ARPT, BUT COULD NOT UNDERSTAND IT. MY RADIOS WERE WORKING FINE IN BOTH XMISSION AND RECEIVE, AS I HAD MADE A CHK WITH TRK UNICOM PRIOR TO TAXIING. WE POSSIBLY BOTH LOOKED INTO THE SUN FOR AN INSTANT ON OUR SCAN, PRIOR TO TAKING POS ON THE RWY, BUT DO NOT BELIEVE THIS WOULD NOT ENABLE US TO SEE AN ACFT ON FINAL. I HAVE BEEN OPERATING FROM THIS ARPT FOR OVER 4 YRS W/O INCIDENT, BUT IT JUST SHOWS EXTREME VIGILANT VISUAL SCANNING IS REQUIRED BY ALL PARTIES IN THESE SITUATIONS.

Data retrieved from NASA's ASRS site as of August 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.