Narrative:

I was instructing a pilot working on his commercial multi-engine rating. We departed ZZZ1 headed out to a practice area and accomplished multi-engine maneuvers to include: slow flight; stalls; steep turns; climbs; and emergency descent. We then accomplished 'engine failure' procedures in the practice area at altitude to include a drag demo and how to handle an in-flight engine failure. Following those maneuvers; which were all uneventful; we proceeded to ZZZ. We entered the VFR traffic pattern for runway xx; and accomplished 5 'stop-and go's'. The first 3 stop and go's were normal; 2 engine landings. The next two were 'single engine' landings; with one engine at idle. All 5 landings were stable approaches; with smooth touchdowns. On each pattern we ran the before landing checklist on downwind; confirmed gear down and locked by checking for 3 green lights and no red 'gear unsafe' light. Additionally; we check the gear status and accomplish a gumps check on base and final.on the 6th and final pattern; we again ran the before landing checklist at midfield downwind; accomplished a gumps check on base and final; each time visually confirming and noting verbally 'gear down; 3 green'. Upon landing; the student landed at a normal touchdown rate; and after touchdown; as he released back pressure on the yoke; the nose gear collapsed and the nose of the aircraft struck the runway. The props came to a stop after striking the runway; and I immediately proceeded to secure the engine to prevent any risk of fire or additional damage to the airplane. I pulled the throttles to idle; mixtures to cut-off; fuel selector to off; mags off; master off; flaps up; and we egressed the aircraft. As mentioned; we had a gear down indication with 3 green gear lights; and no red gear unsafe light. Both the student and I confirmed gear position 3 times during each VFR pattern. I believe this to be a mechanical failure of either the nose gear position indicator sensor; and/or failure of the hydraulic pump.

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Original NASA ASRS Text

Title: A commercial rated pilot and his flight instructor in a PA-34 Piper Seneca experienced a nose landing gear collapse after landing for unknown reasons.

Narrative: I was instructing a pilot working on his commercial multi-engine rating. We departed ZZZ1 headed out to a practice area and accomplished multi-engine maneuvers to include: slow flight; stalls; steep turns; climbs; and emergency descent. We then accomplished 'engine failure' procedures in the practice area at altitude to include a drag demo and how to handle an in-flight engine failure. Following those maneuvers; which were all uneventful; we proceeded to ZZZ. We entered the VFR traffic pattern for runway XX; and accomplished 5 'stop-and go's'. The first 3 stop and go's were normal; 2 engine landings. The next two were 'single engine' landings; with one engine at idle. All 5 landings were stable approaches; with smooth touchdowns. On each pattern we ran the before landing checklist on downwind; confirmed gear down and locked by checking for 3 green lights and no red 'gear unsafe' light. Additionally; we check the gear status and accomplish a GUMPS check on base and final.On the 6th and final pattern; we again ran the before landing checklist at midfield downwind; accomplished a GUMPS check on base and final; each time visually confirming and noting verbally 'gear down; 3 green'. Upon landing; the student landed at a normal touchdown rate; and after touchdown; as he released back pressure on the yoke; the nose gear collapsed and the nose of the aircraft struck the runway. The props came to a stop after striking the runway; and I immediately proceeded to secure the engine to prevent any risk of fire or additional damage to the airplane. I pulled the throttles to idle; mixtures to cut-off; fuel selector to off; mags off; master off; flaps up; and we egressed the aircraft. As mentioned; we had a gear down indication with 3 green gear lights; and no red gear unsafe light. Both the student and I confirmed gear position 3 times during each VFR pattern. I believe this to be a mechanical failure of either the nose gear position indicator sensor; and/or failure of the hydraulic pump.

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.