Narrative:

I finished pre-takeoff checklist and taxied towards end of runway [at an] uncontrolled airport with an active FSS. I was in radio communication with airport FSS. An aircraft reported turning base for a touch and go on the runway in use. I looked and saw the aircraft on base. It appeared as if I had lots of room so I reported my intention to expedite takeoff and clear the area prior to aircraft on base arriving. I rapidly took the runway at the end; which was in the displaced threshold area used for takeoff but not landing. I added the power and started the takeoff. About 1;000 ft down the runway; and just before lifting off; an aircraft reported 'going around.' as I lifted off a cessna 150 passed overhead (with plenty of room to spare) on the missed approach. There had been another aircraft on approach in front of the one I saw on base. The cessna 150 was evidently on final and by focusing on the aircraft on base I missed the one on final and cut him off by taking the runway. Cessna 150 continued climb out in front of me and I departed the pattern; (feeling like less than a pro) without further incident. Problem was haste and not adhering to procedures I teach my students at uncontrolled airports. I train students - prior to takeoff - announce; make a minimum 45 turn on the taxiway towards final to clear the area and preferably a 360 degree clearing turn on the taxiway to search the entire pattern prior to taking the runway; and announce again. If I would have practiced what I preach I most likely would have seen the other aircraft.

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Original NASA ASRS Text

Title: C180 pilot reports not seeing an aircraft on final approach; believing his only traffic is an aircraft on base. The C150 on final approach goes around as the reporter is about to lift off.

Narrative: I finished pre-takeoff checklist and taxied towards end of runway [at an] uncontrolled airport with an active FSS. I was in radio communication with airport FSS. An aircraft reported turning base for a touch and go on the runway in use. I looked and saw the aircraft on base. It appeared as if I had lots of room so I reported my intention to expedite takeoff and clear the area prior to aircraft on base arriving. I rapidly took the runway at the end; which was in the displaced threshold area used for takeoff but not landing. I added the power and started the takeoff. About 1;000 FT down the runway; and just before lifting off; an aircraft reported 'Going Around.' As I lifted off a Cessna 150 passed overhead (with plenty of room to spare) on the missed approach. There had been another aircraft on approach in front of the one I saw on base. The Cessna 150 was evidently on final and by focusing on the aircraft on base I missed the one on final and cut him off by taking the runway. Cessna 150 continued climb out in front of me and I departed the pattern; (feeling like less than a pro) without further incident. Problem was haste and not adhering to procedures I teach my students at uncontrolled airports. I train students - prior to takeoff - announce; make a minimum 45 turn on the taxiway towards final to clear the area and preferably a 360 degree clearing turn on the taxiway to search the entire pattern prior to taking the runway; and announce again. If I would have practiced what I preach I most likely would have seen the other aircraft.

Data retrieved from NASA's ASRS site as of July 2013 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.