Narrative:

My student and I were coming in for our last landing. We had already practiced four landings and this was our last one for a full stop. Our landing was safe; a little left of center line but controllable. After touchdown my student was forgetting to input right rudder. I prompted him along telling him 'right rudder; use your right foot'. At that time we were slowing but veering to the left. I was starting to hop on the rudder pedals to correct the airplane when all of a sudden my student added full power. The braking system for this aircraft is a hand brake. I immediately grabbed the throttle to bring power to idle and reached for the hand brake. But at this point we were accelerating pretty fast and going to the left side of the runway. I was slowing the airplane to a stop when it went into the rocks on the side of the runway. All three tires went into the rocks but the tail was still over the runway. The airplane; the student; and myself were not injured at all. The tower had to shut down the runway because I did need help pushing the airplane off of the rocks. Myself and airport operations pushed the aircraft back onto the runway. I inspected wheels; landing gear; and brakes everything appeared to be fine. I started the airplane back up and was able to taxi across the runway; onto the taxiway to our parking spot. After a thorough inspection the aircraft was not damaged at all; not even scratches to the paint. Myself and my student were completely fine. What I think caused this issue was that my student was trying to assure that our throttle was at idle; but he got confused that pulling throttle out means idle and pushing throttle in is full power. So what he thought was idle was in fact full power. We were in a light sport aircraft that can accelerate very quickly and does not take much power to move the light aircraft. We did land to the left of center line so we were not utilizing the center of the runway which could have allowed us more time to correct the aircraft veering to the left. To correct this situation and to insure it does not occur again I am going to be a lot more strict of landing on center line. Also I will keep my hands very close to the brake and throttle just in case any confusion of the throttle input occurs again.

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Original NASA ASRS Text

Title: An LSA ran off the runway on landing when the instructor pilot was unable to overcome the inappropriate actions of her student.

Narrative: My student and I were coming in for our last landing. We had already practiced four landings and this was our last one for a full stop. Our landing was safe; a little left of center line but controllable. After touchdown my student was forgetting to input right rudder. I prompted him along telling him 'right rudder; use your right foot'. At that time we were slowing but veering to the left. I was starting to hop on the rudder pedals to correct the airplane when all of a sudden my student added full power. The braking system for this aircraft is a hand brake. I immediately grabbed the throttle to bring power to idle and reached for the hand brake. But at this point we were accelerating pretty fast and going to the left side of the runway. I was slowing the airplane to a stop when it went into the rocks on the side of the runway. All three tires went into the rocks but the tail was still over the runway. The airplane; the student; and myself were not injured at all. The Tower had to shut down the runway because I did need help pushing the airplane off of the rocks. Myself and airport operations pushed the aircraft back onto the runway. I inspected wheels; landing gear; and brakes everything appeared to be fine. I started the airplane back up and was able to taxi across the runway; onto the taxiway to our parking spot. After a thorough inspection the aircraft was not damaged at all; not even scratches to the paint. Myself and my student were completely fine. What I think caused this issue was that my student was trying to assure that our throttle was at idle; but he got confused that pulling throttle out means idle and pushing throttle in is full power. So what he thought was idle was in fact full power. We were in a light sport aircraft that can accelerate very quickly and does not take much power to move the light aircraft. We did land to the left of center line so we were not utilizing the center of the runway which could have allowed us more time to correct the aircraft veering to the left. To correct this situation and to insure it does not occur again I am going to be a lot more strict of landing on center line. Also I will keep my hands very close to the brake and throttle just in case any confusion of the throttle input occurs again.

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.