Narrative:

The conflict arose as we were on final approach to land and another aircraft was taxiing into position for takeoff. We executed a go around and there were no problems. However, the situation disturbed me and there could have been a much more serious situation. Our aircraft crossed over X04 (orl county) midfield at 1500 ft, which I broadcasted over unicom (123.05). I also called entering downwind for runway 33 and left base for runway 33. On short final another aircraft began to taxi onto runway 33. He broadcasted that he was taking off runway 33. I instructed my student to go around, which he did. I then called that we were going around. The other aircraft called that he would move over off the runway (into the grass, I guess). I called back that we were already 'on the go.' we departed the pattern, which I broadcasted, as a left downwind departure. We never heard or saw the other aircraft make any moves after we went around. Things that concern me: we turned a short final, which I did not call. Since the runway has aircraft parked all around the arrival end, we probably would not have noticed him unless he called. I thought he was parked like the rest of the aircraft. He (the other aircraft) must not have checked the pattern, been monitoring the frequency, or checked final before taxi. I was too involved in the approach and should have been checking the runway and pattern more closely. I allowed my student to enter at midfield rather than a 45 degree to downwind. More time might have helped.

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Original NASA ASRS Text

Title: INSTRUCTOR WITH SPI ON FINAL APCH HEARS SECOND ACFT ANNOUNCE DEP ON 'SAME' RWY. GAR EXECUTED.

Narrative: THE CONFLICT AROSE AS WE WERE ON FINAL APCH TO LAND AND ANOTHER ACFT WAS TAXIING INTO POS FOR TKOF. WE EXECUTED A GAR AND THERE WERE NO PROBS. HOWEVER, THE SIT DISTURBED ME AND THERE COULD HAVE BEEN A MUCH MORE SERIOUS SIT. OUR ACFT CROSSED OVER X04 (ORL COUNTY) MIDFIELD AT 1500 FT, WHICH I BROADCASTED OVER UNICOM (123.05). I ALSO CALLED ENTERING DOWNWIND FOR RWY 33 AND LEFT BASE FOR RWY 33. ON SHORT FINAL ANOTHER ACFT BEGAN TO TAXI ONTO RWY 33. HE BROADCASTED THAT HE WAS TAKING OFF RWY 33. I INSTRUCTED MY STUDENT TO GAR, WHICH HE DID. I THEN CALLED THAT WE WERE GOING AROUND. THE OTHER ACFT CALLED THAT HE WOULD MOVE OVER OFF THE RWY (INTO THE GRASS, I GUESS). I CALLED BACK THAT WE WERE ALREADY 'ON THE GO.' WE DEPARTED THE PATTERN, WHICH I BROADCASTED, AS A L DOWNWIND DEP. WE NEVER HEARD OR SAW THE OTHER ACFT MAKE ANY MOVES AFTER WE WENT AROUND. THINGS THAT CONCERN ME: WE TURNED A SHORT FINAL, WHICH I DID NOT CALL. SINCE THE RWY HAS ACFT PARKED ALL AROUND THE ARR END, WE PROBABLY WOULD NOT HAVE NOTICED HIM UNLESS HE CALLED. I THOUGHT HE WAS PARKED LIKE THE REST OF THE ACFT. HE (THE OTHER ACFT) MUST NOT HAVE CHKED THE PATTERN, BEEN MONITORING THE FREQ, OR CHKED FINAL BEFORE TAXI. I WAS TOO INVOLVED IN THE APCH AND SHOULD HAVE BEEN CHKING THE RWY AND PATTERN MORE CLOSELY. I ALLOWED MY STUDENT TO ENTER AT MIDFIELD RATHER THAN A 45 DEG TO DOWNWIND. MORE TIME MIGHT HAVE HELPED.

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.