Narrative:

Gear up near-landing.entered traffic pattern at ZZZ for simulated single-engine full-stop landing after 2.5 hour flight. In the traffic pattern; student announced 'landing checklist' but both student and instructor were distracted by tower calling a traffic alert. We were advised that the traffic to follow needed extra room. After locating traffic; we were then advised by tower that we were approaching a helicopter 200 ft. Lower. Student pilot turned base and despite extending downwind; began immediate descent below approach profile. After correcting the profile; I admonished the student to stay on speed and profile. Student struggled with unusually high speed on base and final. Student was showing signs of exhaustion; so I reminded him to keep up his scan and speed control on final approach. Student elected to execute a single-engine go-around from a low height; so I took control reduced power and continued the approach. While flaring for landing; I heard a scraping noise; realized the gear was not extended; applied full power and climbed away from the runway. I then advised tower we were going around and needed to return for an immediate emergency landing. No unusual vibrations or engine roughness were detected. On downwind; I executed the landing checklist and made a normal landing.I believe the distraction of two traffic alerts resulted in both the student and me failing to complete the landing checklist. The student struggling with speed and profile further distracted us and we both failed to verify configuration and complete our final approach checklist.contributing factors: high heat; student checkride stress and a long flight.

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Original NASA ASRS Text

Title: PA-44 Check Airman reported executing a last minute go around when hearing 'scraping noise' due to a gear up landing.

Narrative: Gear up near-landing.Entered traffic pattern at ZZZ for simulated single-engine full-stop landing after 2.5 hour flight. In the traffic pattern; student announced 'Landing checklist' but both student and Instructor were distracted by Tower calling a traffic alert. We were advised that the traffic to follow needed extra room. After locating traffic; we were then advised by Tower that we were approaching a helicopter 200 ft. lower. Student pilot turned base and despite extending downwind; began immediate descent below approach profile. After correcting the profile; I admonished the student to stay on speed and profile. Student struggled with unusually high speed on base and final. Student was showing signs of exhaustion; so I reminded him to keep up his scan and speed control on final approach. Student elected to execute a single-engine go-around from a low height; so I took control reduced power and continued the approach. While flaring for landing; I heard a scraping noise; realized the gear was not extended; applied full power and climbed away from the runway. I then advised Tower we were going around and needed to return for an immediate emergency landing. No unusual vibrations or engine roughness were detected. On downwind; I executed the landing checklist and made a normal landing.I believe the distraction of two traffic alerts resulted in both the student and me failing to complete the landing checklist. The student struggling with speed and profile further distracted us and we both failed to verify configuration and complete our final approach checklist.Contributing factors: High heat; student checkride stress and a long flight.

Data retrieved from NASA's ASRS site 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.