Narrative:

[I was] practicing short field landings under instruction from a cfii. One other C172 school plane was in the pattern and another member of the public in a piper super cub was practicing 3 point landings. All aircraft were making correct CTAF calls and working with each other on the CTAF to provide safe spacing and courtesy to allow each to practice safely. This was my 6th approach of the day. I was established in the pattern and making all correct calls. A new aircraft called from the ground that it was taxiing to the runway. The other school aircraft had just landed whilst we were on left base and it called [that] it had cleared the runway while I was on the base leg. I called and made a turn to short final 2 miles from the threshold of the runway. I was flying a high; steep; slow; 62 KT approach to practice short field landings. I observed two aircraft lined up [and] holding short [of the runway]; one of which (from subsequent events I assume the lead one) called he was holding for our arrival and he had us in sight. At one mile final while in a high rate of sink I heard an aircraft call; 'taking the runway for departure.' I looked down and observed the second aircraft on the taxiway maneuvering around the first one and crossing the hold short line. I believe the first aircraft called a warning to the aircraft that overtook him on the ground that there was an aircraft on final. I beat my instructor to the ptt and called; 'I am on short final.' we both heard a response of; 'we gotcha;' but the plane kept on taxiing across the hold short line and onto the runway. I immediately executed a go around; but due to the landing configuration and the slow approach speed for a practice short field we kept on sinking till my aircraft started to accelerate. The departing aircraft disappeared somewhere under my nose and I went full power; transitioned flaps 30 to 20 and started a vx climb to gain altitude (correct flaps for vx is 10 and we transitioned to F10 as soon as we had sufficient airspeed to do so). My instructor continued to allow me to fly the plane; but asked me to 'step right' and I rolled right and left to fly the upwind on the right side [of the runway] and clear the aircraft we assumed was climbing up under us. While I flew the aircraft; my instructor looked back; but could not see the departing aircraft which he assumed was still underneath us somewhere - probably blowing to the right and downwind in the left crosswind. At approximately 800-900 ft AGL; my instructor then called that I turn left crosswind and as I banked left I saw the other aircraft about 150 ft below us and slightly behind us in a steep right bank departing to the west. Our crosswind turn was made at about runway length. The other aircraft made no other radio calls; that we heard or that the other school aircraft on the ground heard; after his call of 'we gotcha.' we completed another pattern and landed normally. The original plane that had been holding for us made a point of calling on the CTAF while we were on base leg to tell us it was still holding for us to land. Subsequently; the school instructor on the ground told us we were 100 ft above the departing aircraft at our closest and flew a portion of the runway length with my aircraft directly above the takeoff aircraft while we clawed our way up during the go-around. Human factors: I have no idea what went through the mind of the pilot on the ground who took the runway under our nose. I can only guess he was impatient sitting at number 2 on the taxiway and either did not see us or thought he could get out before we arrived. If I was asked to describe the motion of his plane on the taxiway I would say it 'scooted quickly around the first aircraft.' I am a post-solo 100 hour ppl student within 2 lessons or so of a checkride. My instructor was very aware of the circumstances as they developed and it was a matter of a fraction of a second that I beat him to the ptt to call a warning at the aircraftthat took the runway. Similarly he called 'go around' as I was pushing the throttle forward to execute a go-around anyway. [I give] full marks to my excellent instructor for training me to recognize the problem and react as I did. Further marks to my instructor for trusting me to 'fly the plane' and take the command to 'step right' while he devoted his energy to spotting the other aircraft and making another decision to call the crosswind turn when he could not see it. CRM between us meant we shared the load and it allowed him to make decisions while I flew as directed. A transfer of controls at that point might have been less than beneficial to our ability to fly the aircraft and spot the other aircraft. A lesson impressed on me was the importance of flying runway centerline on takeoff. The fact the other aircraft did not and allowed itself to be blown off centerline negated the benefit of us 'stepping right' of the runway during the go around. I will be paying even more attention to flying centerline on all of my future takeoffs.

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Original NASA ASRS Text

Title: A C172 student pilot reported a NMAC after a LSA aircraft acknowledged the reporter's aircraft on the CTAF; short final; and still took the runway to takeoff directly under the reporter who executed a go-around.

Narrative: [I was] practicing short field landings under instruction from a CFII. One other C172 school plane was in the pattern and another member of the public in a Piper Super Cub was practicing 3 point landings. All aircraft were making correct CTAF calls and working with each other on the CTAF to provide safe spacing and courtesy to allow each to practice safely. This was my 6th approach of the day. I was established in the pattern and making all correct calls. A new aircraft called from the ground that it was taxiing to the runway. The other school aircraft had just landed whilst we were on left base and it called [that] it had cleared the runway while I was on the base leg. I called and made a turn to short final 2 miles from the threshold of the runway. I was flying a high; steep; slow; 62 KT approach to practice short field landings. I observed two aircraft lined up [and] holding short [of the runway]; one of which (from subsequent events I assume the lead one) called he was holding for our arrival and he had us in sight. At one mile final while in a high rate of sink I heard an aircraft call; 'taking the runway for departure.' I looked down and observed the second aircraft on the taxiway maneuvering around the first one and crossing the hold short line. I believe the first aircraft called a warning to the aircraft that overtook him on the ground that there was an aircraft on final. I beat my instructor to the PTT and called; 'I am on short final.' We both heard a response of; 'We gotcha;' but the plane kept on taxiing across the hold short line and onto the runway. I immediately executed a go around; but due to the landing configuration and the slow approach speed for a practice short field we kept on sinking till my aircraft started to accelerate. The departing aircraft disappeared somewhere under my nose and I went full power; transitioned flaps 30 to 20 and started a Vx climb to gain altitude (correct flaps for Vx is 10 and we transitioned to F10 as soon as we had sufficient airspeed to do so). My instructor continued to allow me to fly the plane; but asked me to 'step right' and I rolled right and left to fly the upwind on the right side [of the runway] and clear the aircraft we assumed was climbing up under us. While I flew the aircraft; my instructor looked back; but could not see the departing aircraft which he assumed was still underneath us somewhere - probably blowing to the right and downwind in the left crosswind. At approximately 800-900 FT AGL; my instructor then called that I turn left crosswind and as I banked left I saw the other aircraft about 150 FT below us and slightly behind us in a steep right bank departing to the west. Our crosswind turn was made at about runway length. The other aircraft made no other radio calls; that we heard or that the other school aircraft on the ground heard; after his call of 'we gotcha.' We completed another pattern and landed normally. The original plane that had been holding for us made a point of calling on the CTAF while we were on base leg to tell us it was still holding for us to land. Subsequently; the school instructor on the ground told us we were 100 FT above the departing aircraft at our closest and flew a portion of the runway length with my aircraft directly above the takeoff aircraft while we clawed our way up during the go-around. Human factors: I have no idea what went through the mind of the pilot on the ground who took the runway under our nose. I can only guess he was impatient sitting at number 2 on the taxiway and either did not see us or thought he could get out before we arrived. If I was asked to describe the motion of his plane on the taxiway I would say it 'scooted quickly around the first aircraft.' I am a post-solo 100 hour PPL student within 2 lessons or so of a checkride. My instructor was very aware of the circumstances as they developed and it was a matter of a fraction of a second that I beat him to the PTT to call a warning at the aircraftthat took the runway. Similarly he called 'go around' as I was pushing the throttle forward to execute a go-around anyway. [I give] full marks to my excellent instructor for training me to recognize the problem and react as I did. Further marks to my instructor for trusting me to 'fly the plane' and take the command to 'step right' while he devoted his energy to spotting the other aircraft and making another decision to call the crosswind turn when he could not see it. CRM between us meant we shared the load and it allowed him to make decisions while I flew as directed. A transfer of controls at that point might have been less than beneficial to our ability to fly the aircraft and spot the other aircraft. A lesson impressed on me was the importance of flying runway centerline on takeoff. The fact the other aircraft did not and allowed itself to be blown off centerline negated the benefit of us 'stepping right' of the runway during the go around. I will be paying even more attention to flying centerline on all of my future takeoffs.

Data retrieved from NASA's ASRS site as of April 2012 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.