Flight instructor and student reported during touchdown the nose wheel had a strong shimmy and collapsed after the flight crew made several attempts to dampen the shimmy. The aircraft slid to a stop off the runway.
Synopsis
Flight instructor and student reported during touchdown the nose wheel had a strong shimmy and collapsed after the flight crew made several attempts to dampen the shimmy. The aircraft slid to a stop off the runway.
Narrative
Tower instructed us to proceed direct to the numbers of [Runway] 10R; we complied and proceeded to turn approximately a 1.5 mile right base for the runway. In the base leg; we were 50% flaps and airspeed was 90kts IAS. We had a normal; stabilized approach for a base to final turn. Upon turning final; we went to 100% flaps; slowed the aircraft to final approach speed of 80-85 kts. IAS. Upon crossing the numbers of 10R; power smoothly came to Idle and we entered ground effect at 75 kts. IAS; gently touching the mains in a slight nose up attitude. When the nose of the airplane came down; we noticed a strong shimmy and reacted by raising the nose wheel in an attempt to take the weight off the nose strut to settle the shimmy. After lowering the nose; the shimmy had developed again; the same procedure was taken to dampen the shimmy. The nose lowered for a 3rd time; on the 3rd touch; the nose seemed to rise abnormally high; as the nose lowered; the nose gear had collapsed below the fuselage and we had set the nose on the runway; slowly coming to a stop and sliding off to the left side of the runway.
Second reporter narrative
Just after landing on main gear; nosewheel touched and had shimmy (seemed more than normal). After raising nose wheel to interrupt shimmy; the nose was set down a 2nd time - shimmy repeated. Nosewheel was raised again and at 3rd touchdown shimmy was just as severe. On raising the nose wheel a 3rd time; the nose raised abnormal (higher than control input) and upon letting nose down; the gear had fallen away (no normal nose touch) - this caused a prop strike and plane skidded on nose until coming to a rest just off left side of runway.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.