Date: 201704
Local time of day: 1201-1800
Location: ZZZ.Airport, US
Flight conditions: VMC
Weather elements / visibility: Turbulence; Windshear
Light: Daylight
Aircraft: DA40 Diamond Star
Operator: FBO
Operating under: Part 91
Flight plan: None
Mission: Training
Flight phase: Landing
ATC / advisory: CTAF ZZZ
Reporter organization: FBO
Reporter function: Instructor; Pilot Not Flying
Reporter qualification: Flight Crew Commercial; Flight Crew Instrument; Flight Crew Flight Instructor
Human factors: Other / Unknown
Anomaly: Ground Event / Encounter Loss Of Aircraft Control; Ground Excursion Runway; Inflight Event / Encounter Weather / Turbulence
Detector: Person Flight Crew
When detected: In-flight
Result: Aircraft Aircraft Damaged; Flight Crew Executed Go Around / Missed Approach; Flight Crew Rejected Takeoff
Contributing factors: Human Factors; Weather
Primary problem: Human Factors

Narrative: The flight was a dual training flight in a DA-40. I was the Flight Instructor of the aircraft; the student was a primary [foreign] airline student; and the passenger was a primary student as well. After departing; we flew to the southeast practice area to practice slow flight/stalls; before diverting for practice to ZZZ to practice landings. The student conducted a 45 entry to right downwind for runway 23 as the AWOS winds were favoring runway 23. The student was working on maintaining centerline with crosswind correction. Since the student didn't have the longitudinal axis aligned with the runway over the threshold; I instructed the SP (Student pilot) to go around. The SP conducted the correct procedure for a go around and proceeded to make right traffic for runway 23. The second time around in the pattern the student was a little high on glide path; but corrected before 300 feet AGL back on glide path; he was trying to maintain a right crosswind correction with right aileron and left rudder. I noticed he was beginning to flare high; he had a significant crosswind from the right that he was correcting for as well as gusting air; so I told the student to go around when he was about 15-20 feet AGL. I did not touch the controls as he did the correct procedure; but the plane still did sink and we touched down on the runway before we could start a climb out. The touchdown did not feel as though it was a hard landing; as we had had full power in. After touching down the plane began to turn left; and I put my foot on the right rudder but still was not able to overcome the left turn. This is when the plane departed the runway on the left side. We had full power in still from trying to go around; but we were unable to rotate the aircraft. As I took the controls I realized we were not increasing airspeed enough to rotate; so I changed my plan of action from a go-around to a landing. I tried to bring the aircraft back to the right onto the runway; as I did that I thought that the left tire had popped; because it was difficult to control the aircraft with the rudder. Once the plane came to a full stop; I had announced on the CTAF to another landing aircraft to advise them we may have a flat tire and that they should go-around. I then shut down the aircraft per the checklist; and turned the fuel selector to OFF. Once we got out of the airplane we pushed the aircraft off the right side of the runway as it was uncontrolled and I did not want anyone to try to land as we did not have a radio.  I then called dispatch; where they reported to safety and management. During the day; the conditions were turbulent to a small aircraft due to some convective turbulence. During a previous lesson that day; I had taken the controls on some of the landings and the last landing at [the home field] as they were reporting a LLWS advisory. My second student for the day had a little more experience; so I wanted him to get the experience of correcting a crosswind. If at any point I felt that the conditions were unsafe; I told the student to go around. This attempt at go-around was the first actual touchdown during our lesson. During the occurrence; the left main gear had collapsed inward; I was unable to tell if this was during the touchdown or from the left runway departure in the gravel. My only other thought would be that my student had kept in the right crosswind correction with right aileron and left rudder; maybe mistakenly having his foot on the left toe brake as well. Once the main gear collapsed the rudder was not enough to get the aircraft back to the right and on the runway so I tried to use a little bank. Since the left main collapsed the prop was lower to the ground and I believe it struck the ground when we were in the gravel. The right wingtip may have struck after trying to bring the aircraft back to the right.




Synopsis: DA40 flight instructor reported damage to the landing gear and a possible propeller strike after an attempted go-around by his student during a gusty crosswind landing.